Method of reducing the value of an alkylene oxide production parameter in a process of making an alkylene oxide using a high efficiency catalyst

Methods of reducing the value of an alkylene oxide production parameter (such as alkylene oxide production rate) in a process of making an alkylene oxide by reacting an alkylene and oxygen over a high efficiency catalyst are shown and described. One method comprises reducing the concentration of oxygen in the reactor feed gas to reduce the value of the alkylene oxide production parameter.

PROCESS FOR CONDITIONING A HIGH EFFICIENCY ETHYLENE OXIDE CATALYST

A process for conditioning a high efficiency silver catalyst used to manufacture ethylene oxide from ethylene, oxygen, and at least one organic chloride is described. A non-reactive conditioning gas comprising at least one of ethylene, oxygen, and a ballast gas is introduced to the catalyst at a conditioning temperature ranging from 150° C. to 180° C. for a selected period of at least 4 hours. 1. A process for conditioning a high efficiency silver catalyst used to manufacture ethylene oxide by reacting ethylene , oxygen , and at least one organic chloride over the catalyst , the conditioning process comprising the steps of:introducing a feed gas to the high efficiency silver catalyst at one or more conditioning temperatures ranging from 150° C. to 180° C. for a selected period of time, wherein the selected period of time is at least 4 hours, and the feed gas comprises at least one component selected from the group consisting of ethylene, methane, and nitrogen, and the introducing step occurs such that the catalyst is not simultaneously exposed to ethylene and oxygen during the selected period of time.2. The process for conditioning a high efficiency silver catalyst of claim 1 , wherein the high efficiency silver catalyst is a fresh catalyst.3. The process for conditioning a high-efficiency silver catalyst of claim 1 , wherein the selected period of time is at least 12 hours.4. The process for conditioning a high-efficiency silver catalyst of claim 1 , wherein the selected period of time is no greater than 200 hours.5. The process for conditioning a high-efficiency silver catalyst of claim 1 , wherein the at least one component is ethylene and nitrogen.6. The process for conditioning a high-efficiency silver catalyst of claim 1 , wherein the at least one component is nitrogen.7. The process for conditioning a high-efficiency silver catalyst of claim 1 , wherein the high-efficiency silver catalyst is an aged catalyst.8. The process for conditioning a high-efficiency ...

METHOD OF STARTING-UP A PROCESS OF PRODUCING AN ALKYLENE OXIDE USING A HIGH-EFFICIENCY CATALYST

A method for starting-up a high efficiency alkylene oxide catalyst is described. A feed gas comprising an alkylene, oxygen, and at least one organic chloride is introduced to the catalyst. The molar ratio of oxygen to alkylene, reaction temperature, and overall chloriding effectiveness are adjusted to specified ranges of values within a specified catalyst aging period. 2. The method of claim 1 , further comprising selecting a target alkylene oxide concentration in the reaction product and maintaining the molar ratio of oxygen to alkylene of at least 0.2 no longer than until the start-up concentration of the alkylene oxide in the reaction product is substantially equal to the target concentration of the alkylene oxide in the reaction product.3. The method claim 2 , wherein the step of maintaining the molar ratio of oxygen to the alkylene in the feed gas of at least 0.2 is conducted no longer than until the efficiency of the process to the alkylene oxide is at least 85%.4. The method of claim 2 , wherein the step of maintaining the molar ratio of oxygen to the alkylene in the feed gas of at least 0.2 is conducted no longer than until the start-up concentration of the alkylene oxide in the reaction product is at least 1.5 mole %.5. The method of claim 1 , wherein the step of adjusting both the reaction temperature and the overall chloriding effectiveness comprises adjusting at least one of the reaction temperature and Z* according to the following relationship:{'br': None, 'i': Z*', 'T', '−T', 'S, 'sub': rx', 'o', 'o, '=()/'} [{'sub': 'rx', 'Tis the reactor coolant inlet temperature in ° C.,'}, {'sub': o', 'rx, 'Tis the temperature-axis intercept calculated by extrapolating a plot of Z* versus Tto Z*=0, and'}, {'sub': 'o', 'Sis a slope relating the change in inlet coolant temperature to the corresponding change in Z*.'}], 'wherein,'}6. The method of claim 1 , wherein within a catalyst aging period of no greater than 0.02 kT alkylene oxide/mcatalyst after the reactor is ...

PROCESS FOR PRODUCING POLYETHYLENE

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (I) RSi(OR), (I) where n is an integer 0 to 3, each Rare equal or different and are selected among H, halogen, alkyl groups of 1 to 6 10 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the Rgroups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all Rare not hydrogen, Rare equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the ORgroups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, Cl or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRRat least 40 and/or polydispersity index PDI of at least 27. 1. A multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage for producing ethylene copolymers comprising the steps of(a1) introducing ethylene, optionally hydrogen and optionally alpha-olefin comonomer having from 4 to 10 carbon atoms into an optional polymerization stage A1 in the presence of a solid catalyst Ziegler-Natta component, a cocatalyst and ...

IMPROVED ADHESIVE POLYMER COMPOSITION

An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95% by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm, and at most 0.1 vinyl groups/1000 carbon atoms. The non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid rafting agent. 1. An adhesive polymer composition comprising{'sup': '3', 'a) a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, which non-elastomeric copolymer is present in an amount of 60 to 95% by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm, and at most 0.1 vinyl groups/ 1000 carbon atoms, and'}b) an elastomer,wherein the non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent.2. The adhesive polymer composition according to claim 1 , wherein the non-elastomeric copolymer is present in an amount of 70 to 90% by weight based on the adhesive polymer composition.3. The adhesive polymer composition according to claim 1 , wherein the non-elastomeric copolymer has an MFRof from 1 to 20 g/10 min claim 1 , more preferably from 1 to 10 g/10 min.4. The adhesive polymer composition according to claim 1 , wherein said component a) has a density of from 0.930 to 0.942 g/cm5. The adhesive polymer composition according to claim 1 , wherein the non-elastomeric copolymer is a polyethylene with unimodal molecular weight distribution.6. The adhesive polymer composition according to claim 1 , wherein ...

Multimodal copolymer of ethylene and at least two alpha-olefin comonomers and final articles made thereof

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. Such multimodal copolymers are highly suitable for conversion processes that require a high Draw Down Ratio, like the production of thin films. Such multimodal polyethylene copolymers provide a good impact strength in the sense of a high Dart drop impact strength (DDI) and good isotropy of the films produces thereof. The invention further presents final articles such as films made therefrom.

PROCESS AND REACTOR ASSEMBLY FOR THE ENHANCEMENT OF HYDRODYNAMICS IN A GAS-SOLIDS FLUIDIZED BED REACTOR

A process for polymerizing olefin monomer(s) in a gas-solids olefin polymerization reactor comprising a top zone; a middle zone, which comprises a top end in direct contact with said top zone and which is located below said top zone, the middle zone having a generally cylindrical shape; and a bottom zone, which is in direct contact with a bottom end of the middle zone and which is located below the middle zone; comprising the following steps: introducing a fluidization gas stream into the bottom zone; polymerizing olefin monomer(s) in the presence of a polymerization catalyst in a dense phase formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone; introducing a jet gas stream through one or more jet gas feeding ports in a jet gas feeding area of the middle zone at the dense phase in the middle zone of the gas-solids olefin polymerization reactor; wherein the kinetic energy (E) input in the reactor by the jet stream is between 1.5 and 50 times higher than the kinetic energy (E) input in the reactor by the fluidization gas stream (FG). 2186. The process according to claim 1 , wherein the fluidization gas is removed from the top zone () of the reactor and at least a part of the fluidization gas is introduced into the jet gas stream () and into the fluidization stream ().35. The process according to claim 1 , wherein the jet gas stream (JG) fed through at least one of the one or more jet gas feeding ports () is provided by a flash pipe (FP) from a preceding reactor claim 1 , preferably a reactor for polymerizing polypropylene claim 1 , more preferably a loop reactor for polymerizing polypropylene.4. The process according to claim 1 , wherein the jet gas stream (JG) is cooled to yield a partially condensed jet gas stream and wherein the fluidization gas stream (FG) is not condensed.568. The process according to claim 1 , wherein the fluidization gas stream (FG) in the first line () and ...

PROCESS FOR PRODUCING LLDPE RESINS

A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/mand a melt flow rate MFRmeasured at 190° C. under 21.6 kg load of from 3 to 150 g/10 min. The process includes the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the Ziegler-Natta catalyst; and (C) recovering the polymer mixture. 2. The process according to comprising the additional steps of (a) providing solid carrier particles of MgCl*mROH adduct; (b) pre-treating the solid carrier particles of step (a) with a compound of Group 13 metal; (c) treating the pre-treated solid carried particles of step (b) with a transition metal compound of Group 4 to 6; (d) recovering the solid catalyst component; (e) contacting the solid carrier particles with the internal organic compound compound having the formula (I) prior to the step (c); and (f) passing the solid catalyst component into the first polymerisation stage claim 1 , wherein R in the adduct MgCl*mROH is a linear or branched alkyl group with 1 to 12 carbon atoms and m is a number from 0 to 6.3. The process according to wherein the hydrogen to ethylene ratio in the fluid reaction phase of the first polymerisation stage is from 200 to 1000 mol/kmol.4. The process according to wherein the first homo- or copolymer of ethylene is a homopolymer of ethylene and no comonomer is present in the first polymerisation stage.5. The process according to wherein the ...

Jacket with improved properties

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m 3 and a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa]<21.35·density [kg/m3]−19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket.

MULTIMODAL POLYETHYLENE COPOLYMER

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. The multimodal polyethylene copolymer is highly suitable for the production of films providing high impact strength in the sense of high Dart drop impact strength (DDI) and low extractables. The invention further presents final articles such as films made therefrom. 113-. (canceled)14. A multimodal copolymer of ethylene and at least two alpha-olefin-comonomers having{'sup': '3', 'a) a density of from 906 to 925 kg/mdetermined according to ISO 1183,'}{'sub': '21', 'b) an MFRof 10-200 g/10 min. determined according to IS01133,'}{'sub': 'FDA', 'c) an amount of hexane soluble fraction (C6) of 4.50 wt. % or below,'}wherein the multimodal copolymer of ethylene comprisesd) a first copolymer of ethylene comprising a first alpha-olefin comonomer having 4 to 10 carbon atoms and further comprising at least a first and a second fraction of the first copolymer of ethylene and the first alpha-olefin comonomer ande) a second copolymer of ethylene comprising a second alpha-olefin comonomer having 6 to 10 carbon atoms.15. A multimodal copolymer of ethylene of wherein the first and the second fraction of the first copolymer of ethylene and the first alpha-olefin comonomer are produced in two consecutive steps.16. A multimodal copolymer of ethylene of wherein the multimodal copolymer of ethylene comprisesc1) 50 wt. % or less of the first copolymer of ethylene 14 d)d1) 50 wt. % or more of the second copolymer of ethylene 14 e).17. A multimodal copolymer of ethylene of wherein the first copolymer of ethylene and a first alpha olefin comonomer d) has{'sup': '3', 'i. a density of from 945 to 955 kg/mand'}{'sub': '2', 'ii. a melt flow rate MFRof 150 to 1500 g/10 min.'}18. A multimodal copolymer of ethylene of wherein the second copolymer of ethylene and a second alpha olefin comonomer 1) e) has a density of from =<903 kg/ ...

METHOD OF REDUCING OR MAINTAINING THE VALUE OF AN ALKYLENE OXIDE PRODUCTION PARAMETER IN A PROCESS OF MAKING AN ALKYLENE OXIDE USING A HIGH EFFICIENCY CATALYST

Methods of reducing or maintaining the value of an alkylene oxide production parameter (such as alkylene oxide production rate) in a process of making an alkylene oxide by reacting an alkylene and oxygen over a high efficiency catalyst are shown and described. One method comprises reducing the concentration of oxygen in the reactor feed gas to reduce or maintain the value of the alkylene oxide production parameter. 1. A method of maintaining a desired value of an alkylene oxide production parameter in a process for making the alkylene oxide by reacting a feed gas comprising an alkylene , oxygen , and at least one organic chloride over a high-efficiency silver catalyst , the method comprising the steps of:selecting a target value of alkylene concentration in the feed gas and a target value of oxygen concentration in the feed gas, wherein the target value of the alkylene concentration in the feed gas, the target value of the oxygen concentration in the feed gas, and the desired alkylene oxide production parameter correspond to a first reaction temperature; andmaintaining at least one selected from the group consisting of the alkylene concentration in the feed gas and the oxygen concentration in the feed gas below its corresponding target value to maintain the desired value of the alkylene oxide production parameter at a second reaction temperature greater than the first reaction temperature.2. The method of claim 1 , wherein the second reaction temperature corresponds to a minimum achievable reactor coolant temperature.3. The method of claim 1 , wherein the step of maintaining at least one selected from the group consisting of the alkylene concentration in the feed gas and the oxygen concentration in the feed gas below its corresponding target value further comprises maintaining an overall catalyst chloriding effectiveness at a substantially constant value.4. The method of claim 1 , wherein the step of maintaining at least one selected from the group consisting of the ...

JACKET WITH IMPROVED PROPERTIES

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/mand a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa]<21.35·density [kg/m3]−19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket. 2. The multimodal ethylene copolymer composition according to claim 1 , wherein said multimodal ethylene copolymer composition comprises an ethylene copolymer comprising at least one alpha-olefin comonomer of Cto C.3. The multimodal ethylene copolymer composition according to claim 2 , wherein said ethylene copolymer comprises at least two alpha-olefin-comonomer(s).4. The multimodal ethylene copolymer composition according to claim 3 , wherein said ethylene copolymer comprises:at least a first alpha-olefin comonomer comprising 1-hexene; anda second alpha-olefin comonomer different from the first alpha-olefin comonomer.5. The multimodal ethylene copolymer composition according to claim 4 , wherein said ethylene copolymer comprises at least 1-butene and 1-hexenecomonomers.6. (canceled)7. The multimodal ethylene copolymer composition according to claim 1 , wherein said multimodal ethylene copolymer composition has MFRmeasured according to ISO 1133 at 190° C. of 0.7 to 1.5 g/10 min.8. The multimodal ethylene copolymer composition according to claim 1 , wherein said multimodal ethylene copolymer composition has MFRmeasured according to ISO 1133 at 190° C. of 0.3 to 12 g/10 min.9. The multimodal ethylene copolymer composition according to claim 1 , wherein said multimodal ethylene copolymer composition has MFRmeasured according to ISO 1133 at 190° C. of 20 to 180 g/10 min.10. (canceled)11. The multimodal ethylene copolymer composition according to claim 1 , wherein the flexural modulus is following the inequality:{'br': None, 'sup': '3', 'Flexural modulus [MPa]<21.35·density [ ...

PROCESS FOR POLYMERISING ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE

The present invention deals with a process for polymerising ethylene in the presence of an olefin polymerisation catalyst comprising titanium, magnesium and halogen in at least one polymerisation stage where ethylene is polymerised in slurry, the process comprising treating the polymerisation catalyst in a pre-treatment step by polymerising an olefin on the polymerisation catalyst so that the ratio of the weight of the olefin polymer to the weight of the original solid catalyst component is from 0.1 to 10 g/g and using the pre-treated catalyst in the production of ultra-high molecular weight polyethylene. 115-. (canceled)16. A process for polymerising ethylene in the presence of an olefin polymerisation catalyst comprising titanium , magnesium and halogen in at least one polymerisation stage where ethylene is polymerised in slurry , the process comprising the steps of:a. introducing the polymerisation catalyst into a pre-treatment step operated at a temperature of from 0 to 50° C. and a pressure of from 1 to 20 bar;b. introducing an olefin into the pre-treatment step wherein the olefin introduced into the pre-treatment step is a vinyl unsubstituted olefin selected from the group consisting of propylene, 1-butene, 4-methyl-1-pentene and vinyl cyclohexane;c. polymerising the olefin on the polymerisation catalyst in the pre-treatment step to form a pre-treated catalyst comprising an olefin polymer on the polymerisation catalyst so that the ratio of the weight of the olefin polymer to the weight of the original solid catalyst component is from 0.1 to 10 g/g;d. recovering the pre-treated catalyst from the pre-treatment step;e. introducing ethylene, a diluent and the pre-treated catalyst into a slurry polymerisation step operated at a temperature of from 30 to 110° C. and a pressure of from 1 to 100 bar to polymerise ethylene on the pre-treated catalyst to produce polyethylene having a viscosity average molecular weight of from 700000 to 5000000 g/mol.17. The process ...

A MULTI-STAGE PROCESS FOR PRODUCING A C2 TO C8 OLEFIN POLYMER COMPOSITION

The present invention relates to a multi-stage process for producing a Cto Colefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a Cto Colefin monomer before feeding to the polymerization process. 1: A continuous multi-stage process for producing a Cto Colefin polymer composition in a process comprising at least two reactors , the process comprising the steps of:{'sub': 2', '8', '2', '8, 'a) introducing a stream of a pre-polymerized solid Ziegler-Natta catalyst a monomer of Cto Colefin into a first polymerization reactor, thereby producing a first Cto Colefin polymer;'}{'sub': 2', '8, 'b) withdrawing a stream comprising the first Cto Colefin polymer from the first polymerization reactor and passing it into a second polymerization reactor;'}{'sub': 2', '8', '2', '8', '2', '8, 'c) introducing a stream of a monomer of Cto Colefin into the second polymerization reactor, thereby producing in the second polymerization a first polymer mixture comprising the first Cto Colefin polymer and a second polymer of the Cto Colefin monomer in the second polymerization reactor; and'}d) withdrawing a stream comprising the first polymer mixture from the second polymerization reactor;{'sub': 2', '4', '90', '10', '50, 'wherein the pre-polymerized solid Ziegler-Natta catalyst is prepared by off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a Cto Colefin monomer before feeding to the polymerization process, and wherein the pre-polymerized solid Ziegler-Natta catalyst has a particle size distribution span ((d−d)/d) of below 1.5.'}2: The continuous multi-stage process of according to claim 1 , wherein the solid Ziegler-Natta catalyst component comprises:(a1) a compound of a transition metal (TM), which transition metal is selected from one of the groups 4 to 6 of the periodic table ( ...

MULTISTAGE PROCESS FOR PRODUCING POLYETHYLENE COMPOSITIONS

The present invention is a process for producing low density copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages in the presence of an olefin polymerization catalyst where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low density of not more than 920 kg/m. 1. A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a polymerization catalyst , the copolymer having a density of from 906 to 920 kg/m3 and a melt flow rate MFR5 measured at 190° C. under 5 kg load of from 0.5 to 5.0 g/10 min in three polymerization stages comprising the steps ofcopolymerizing ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerization stage in the presence of the polymerization catalyst to produce particles of a first copolymer of ethylene having a density of from 945 to 955 kg/m3 and a melt flow rate MFR2 measured at 190° C. under 2.16 kg load of from 150 to 1000 g/10 min;copolymerizing ethylene and the first alpha-olefin in a second polymerization stage in the presence of the first copolymer of ethylene to produce particles of a first copolymer mixture comprising the first copolymer of ethylene and a second copolymer of ethylene, the first copolymer mixture having a density of from 945 to 955 kg/m3 and a melt flow rate MFR2 of from 150 to 1000 g/10 min;copolymerizing ethylene and a second alpha-olefin in a third polymerization stage in the presence of the first copolymer mixture to produce particles of a second copolymer mixture comprising the first copolymer mixture and a third copolymer of ethylene, the second copolymer mixture having a density of from 906 to 920 kg/m3 and a melt flow rate MFR5 of from 0.5 to 5.0 g/10 min;recovering the second copolymer mixture.2. The process according to wherein the first ...

MULTISTAGE PROCESS FOR PRODUCING POLYETHYLENE COMPOSITIONS

The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications. 1. A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a polymerization catalyst , the copolymer having a density of from 906 to 925 kg/mand a melt flow rate MFRmeasured at 190° C. under 5 kg load of from 0.5 to 5.0 g/10 min in three polymerization stages comprising the steps of{'sup': '3', 'sub': '2', 'copolymerizing ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerization stage in the presence of the polymerization catalyst to produce a first copolymer of ethylene having a density of from 945 to 955 kg/mand a melt flow rate MFRmeasured at 190° C. under 2.16 kg load of from 150 to 1000 g/10 min;'}{'sup': '3', 'sub': '2', 'copolymerizing ethylene and the first alpha-olefin in a second polymerization stage in the presence of the first copolymer of ethylene to produce a first copolymer mixture comprising the first copolymer of ethylene and a second copolymer of ethylene, the first copolymer mixture having a density of from 945 to 955 kg/mand a melt flow rate MFRof from 150 to 1000 g/10 min;'}{'sup': '3', 'sub': '5', 'copolymerizing ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a third polymerization stage in the presence of the first copolymer mixture to produce a second copolymer mixture comprising the first copolymer mixture and a third copolymer of ethylene, the second copolymer mixture having a density of from 906 to 925 kg/mand a melt flow rate MFRof from 0.5 to 5.0 g/10 min;'}recovering the ...

POLYMER COMPOSITION AND A PROCESS FOR PRODUCTION OF THE POLYMER COMPOSITION

A polyethylene composition comprising a base resin is disclosed herein. The base resin includes an ethylene homo- or copolymer fraction (A1), and an ethylene homo- or copolymer fraction (A2). Fraction (A1) has a lower weight average molecular weight than fraction (A2). The base resin has a melt flow rate MFRof equal to or less than 8.0 g/10 min and a density of 930 to 950 kg/m3. The polyethylene composition has a melt flow rate MFRof 0.01 to 0.3 g/10 min, a flow rate ratio FRRof equal to or more than 20 and a ratio of the weight average molecular weight and the number average molecular weight (M/M) of equal to or less than 30. Also the polyethylene composition has a tensile modulus of less than 1000 MPa. Also a process for the production of a polyethylene composition comprising polyethylene base resin is disclosed herein. 1. A polyethylene composition comprising a base resin which comprises(a) an ethylene homo- or copolymer fraction (A1); and(b) an ethylene homo- or copolymer fraction (A2),wherein(I) fraction (A1) has a lower weight average molecular weight than fraction (A2);{'sup': '3', '(II) the base resin has a density of 930 to 950 kg/m;'}{'sub': '21', '(III) the base resin has a melt flow rate MFRof equal to or less than 8.0 g/10 min;'}{'sub': '5', '(IV) the polyethylene composition has a melt flow rate MFRof 0.01 to 0.3 g/10 min;'}{'sub': '21/5', '(V) the polyethylene composition has a flow rate ratio FRRof equal to or more than 20;'}{'sub': w', 'n, '(VI) the ratio of the weight average molecular weight and the number average molecular weight (M/M) of the polyethylene composition is equal to or less than 30; and'}(VII) the polyethylene composition has a tensile modulus of less than 1000 MPa.2. A polyethylene composition according to claim 1 , wherein the ratio of the weight average molecular weight and the number average molecular weight (M/M) of the polyethylene composition is 5 to 30 claim 1 , preferably 10 to 30 claim 1 , most preferably 15 to 25.3. A ...

PROCESS FOR PRODUCING POLYETHYLENE

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (1) RSi(OR), (I) where n is an integer 0 to 3, each Rare equal or different and are selected among H, halogen, alkyl groups of 1 to 6 10 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the Rgroups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all Rare not hydrogen, Rare equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the ORgroups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, Cl or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRRat least 40 and/or polydispersity index PDI of at least 27. 1. (canceled)2. (canceled)3. The Ziegler-Natta catalyst according to claim 14 , wherein in the formula (I) n is an integer 1 to 3 claim 14 , all Rgroups are the same or different and are hydrogen or alkyl groups of 1 to 6 carbon atoms or aryl groups of 6 to 12 carbon atoms claim 14 , provided that all Rare not hydrogen claim 14 , and all Rgroups are the same and are alkyl groups of 1 to 3 carbon atoms.4. The Ziegler-Natta ...

GAS PHASE POLYMERIZATION PROCESS

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed, cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that Nis within the range of from 2.5 to 7. 2. The process according to wherein is within the range of from 2.5 to 5.3. The process according to wherein the ratio L/D is from 4 to 15.4. The process according to wherein the ratio L/D is from 5 to 10.5. The process according to comprising the step of removing polymer from the fluidization gas which has been withdrawn from the top zone of the reactor before the compression and cooling steps.6. The process according to wherein the polymer removed from the fluidization gas is recovered and passed to further processing.7. The process according to wherein the polymer removed from the fluidization gas is returned to the polymerization reactor.8. The process according to wherein polymer is withdrawn from the reactor through an outlet located in the middle zone.9. The process according to wherein the polymer is withdrawn from the reactor continuously.10. The process according to wherein polymer or polymer agglomerates are ...

MULTISTAGE PROCESS FOR PRODUCING POLYETHYLENE COMPOSITIONS

A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation. 115-. (canceled)16. A process for producing multimodal ethylene polymers in the presence of a polymerization catalyst comprising the steps of:polymerizing ethylene in a first polymerization stage at a temperature of from 30 to 70° C., preferably from 40 to 60° C. and a pressure of from 1 to 150 bar, preferably from 10 to 100 bar, in the presence of the polymerization catalyst to produce a first homo- or copolymer of ethylene;polymerizing ethylene in a second polymerization stage at a temperature of from 50 to 115° C., preferably from 90 to 105° C., and a pressure of from 1 to 150 bar, preferably from 50 to 100 bar in the presence of hydrogen and the first homo- or copolymer of ethylene to produce a first ethylene polymer mixture comprising the first homo- or copolymer of ethylene and a second homopolymer of ethylene;{'sub': 21', '2', '21, 'sup': '3', 'copolymerizing ethylene in a third polymerization stage at a temperature of from 50 to 100° C., preferably from 65 to 90° C., and a pressure of from 10 to 40 bar, preferably from 15 to 30 bar, in the presence of an alpha-olefin comonomer having from 4 to 10 carbon atoms and the first ethylene polymer mixture to produce a second ethylene polymer mixture comprising the first ethylene polymer mixture and a third copolymer of ethylene; wherein the first ethylene homopolymer has a melt flow rate MFRof not more than 1.0 g/10 min; the first ethylene polymer mixture has a melt flow rate MFRof from 10 to 250 g/10 min; and the second ethylene polymer mixture has a ...

Process for producing lldpe resins

Inlet system for settled bed polymerization reactors

Improved adhesive polymer composition

An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95 % by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm 3 , and at most 0.1 vinyl groups/ 1000 carbon atoms. The non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent.

Improved adhesive polymer composition

An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95 % by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm3, and at most 0.1 vinyl groups/ 1000 carbon atoms. The non- elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent.

Gas phase polymerization and reactor assembly comprising a fluidized bed reactor and an external moving bed reactor

The present invention relates to a reactor assembly for the catalytic polymerization of olefin monomer and optionally comonomer(s) comprising at least one fluidized bed reactor (1) and at least one moving bed reactor (2) adjacent to the fluidized bed reactor (1), wherein the moving bed reactor (2)comprises an inlet at the upper section of the moving bed reactor (2) which is directly connected to an outlet of the fluidized bed reactor (1), and an outlet at the lower section of the moving bed reactor (2) which is directly connected to an inlet of the fluidized bed reactor (1) by means of a conveying pipe (5), and said conveying pipe is provided with means (7) for pneumatically displacing polymer particles from said outlet of moving bed reactor (2) to said inlet of the fluidized bed reactor (1), which pneumatic displacing means (7) comprises an inlet for pneumatic gas to said conveying pipe (5), wherein the reactor assembly is characterized in that said conveying pipe (5) follows a horizontal or declining direction from said outlet of the moving bed reactor (2) to said inlet of the fluidized bed reactor (1), said conveying pipe (5) has a length of not longer than three times the diameter of the moving bed reactor (2). It also relates to a process for producing olefin polymers by catalytically polymerizing olefin monomer and optionally comonomer(s) in at least one interconnected fluidized bed reactor and the use of the reactor assembly for the production of an olefin polymer.

High temperature resistant polyethylene and process for the production thereof

The present invention is concerned with a polyethylene composition comprising a base resin having a density of more than 952.0 kg/m 3 and equal to or less than 957.0 kg/m 3 , wherein the composition has a melt flow rate MFR 5 of 0.12 to 0.21 g/10min and the polyethylene composition has a polydispersity index PI within the range of higher than 4.9 Pa -1 and equal to or less than 9.0 Pa -1 . Furthermore, the present invention concerns a polyethylene composition obtainable by a multistage process, the multistage process comprising polymerizing ethylene in the presence of a silica supported Ziegler Natta catalyst in a reactor cascade comprising a first loop reactor, a second loop reactor and a gas phase reactor for obtaining the base resin and then extruding the base resin together with stabilizers and carbon black into the polyethylene composition. Furthermore, the present invention relates to an article, such as a pipe, made from the polyethylene composition and the use of the polyethylene composition for the production of such an article.

Multistage process for producing polyethylene compositions

A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.

Multistage process for producing polyethylene compositions

The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications.

Process for producing lldpe resins

The present invention is directed to a process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a polymerisation catalyst. The resulting copolymer has a density of from 906 to 937 kg/m 3 and a melt flow rate MFR 21 measured at 190 °C under 21.6 kg load of from 3 to 100 g/10 min. The process comprising the steps of: (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin wherein the molar ratio of hydrogen to ethylene in the fluid reaction mixture of the first polymerisation stage is from 200 to 50000 mol/kmol and the molar ratio of the first alpha-olefin to ethylene in the fluid reaction mixture of the first polymerisation stage is from 0 to 1500 mol/kmol, to produce a first homo- or copolymer of ethylene; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene to produce a polymer mixture comprising the first homo- or copolymer of ethylene and a second copolymer of ethylene, the polymer mixture having a density of from 906 to 937 kg/m 3 and a melt flow rate MFR 21 of from 3 to 150 g/10 min; (C) recovering the polymer mixture. The polymerisation catalyst comprises an internal organic compound having the formula (I): wherein in the formula (I) R 1 to R 5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R 1 to R 5 can form a ring, and the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated.

Jacket with improved properties

The invention is an ethylene copolymer composition with a high flexibility. The ethylene copolymer composition has a density of 920 and 949 kg/m 3 and can be used in a cable jacket, suitably a power cable jacket. The advantage of the ethylene copolymer composition is a more flexible jacket while maintaining the density, while maintaining mechanical performance.

Polymer composition and a process for production of the polymer composition

A polyethylene composition comprising a base resin is disclosed herein. The base resin includes an ethylene homo- or copolymer fraction (A1), and an ethylene homo- or copolymer fraction (A2). Fraction (A1) has a lower weight average molecular weight than fraction (A2). The base resin has a melt flow rate MFR 21 of equal to or less than 8.0 g/10 min and a density of 930 to 950 kg/m3. The polyethylene composition has a melt flow rate MFR 5 of 0.01 to 0.3 g/10 min, a flow rate ratio FRR 21/5 of equal to or more than 20 and a ratio of the weight average molecular weight and the number average molecular weight (M w /M n ) of equal to or less than 30. Also the polyethylene composition has a tensile modulus of less than 1000 MPa. Also a process for the production of a polyethylene composition comprising polyethylene base resin is disclosed herein.

Multistage process for producing polyethylene compositions

The present invention is a process for producing low density copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages in the presence of an olefin polymerization catalyst where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low density of not more than 920 kg/m 3 .

Process for producing polyethylene

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (I) R 1 n Si(OR 2 ) 4-n , (I) where n is an integer 0 to 3, each R 1 are equal or different and are selected among H, halogen, alkyl groups of 1 to 6 10 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the R 1 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all R 1 are not hydrogen, R 2 are equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the OR 2 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, CI or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRR 21/5 at least 40 and/or polydispersity index PDI of at least 27.

Polyethylene composition for a film layer

The present invention relates to a polymer composition, to the use of the polymer composition in film applications and to a film comprising the polymer composition of the invention.

Polyethylene composition for a film layer

The present invention relates to a multimodal polymer of ethylene, to the use of the multimodal polymer of ethylene in film applications and to a film comprising the multimodal polymer of ethylene of the invention.

Multistage process for producing polyethylene compositions

A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.

High temperature resistant polyethylene and process for the production thereof

The present invention is concerned with a polyethylene composition comprising a base resin having a density of more than 952.0 kg/m 3 and equal to or less than 957.0 kg/m 3 , wherein the composition has a melt flow rate MFR 5 of 0.12 to 0.21 g/10min and the polyethylene composition has a polydispersity index PI within the range of higher than 4.9 Pa -1 and equal to or less than 9.0 Pa -1 . Furthermore, the present invention concerns a polyethylene composition obtainable by a multistage process, the multistage process comprising polymerizing ethylene in the presence of a silica supported Ziegler Natta catalyst in a reactor cascade comprising a first loop reactor, a second loop reactor and a gas phase reactor for obtaining the base resin and then extruding the base resin together with stabilizers and carbon black into the polyethylene composition. Furthermore, the present invention relates to an article, such as a pipe, made from the polyethylene composition and the use of the polyethylene composition for the production of such an article.

Multistage process for producing polyethylene compositions

The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications.

Process for producing polyethylene

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (I) R 1 n Si(OR 2 ) 4-n , (I) where n is an integer 0 to 3, each R 1 are equal or different and are selected among H, halogen, alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the R ′ groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all R 1 are not hydrogen, R 2 are equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the OR 2 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, Cl or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRR 21/5 at least 40 and/or polydispersity index PDI of at least 27.

Process for producing LLDPE resins

A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 measured at 190° C. under 21.6 kg load of from 3 to 150 g/10 min. The process includes the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the Ziegler-Natta catalyst; and (C) recovering the polymer mixture.

Process for producing lldpe resins

The present invention is directed to a process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m 3 and a melt flow rate MFR 21 measured at 190 °C under 21.6 kg load of from 3 to 150 g/10 min comprising the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin wherein the molar ratio of hydrogen to ethylene in the fluid reaction mixture of the first polymerisation stage is from 200 to 50000 mol/kmol and the molar ratio of the first alpha-olefin to ethylene in the fluid reaction mixture of the first polymerisation stage is from 0 to 1500 mol/kmol, to produce a first homo- or copolymer of ethylene; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the solid Ziegler-Natta catalyst to produce a polymer mixture comprising the first homo- or copolymer of ethylene and a second copolymer of ethylene, the polymer mixture having a density of from 906 to 937 kg/m 3 and a melt flow rate MFR 21 of from 3 to 150 g/10 min; (C) recovering the polymer mixture, characterised in that the polymerisation catalyst comprises an internal organic compound having the formula (I): wherein in the formula (I) R 1 to R 5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R 1 to R 5 can form a ring, and the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated.

Jacket with improved properties

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m 3 and a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa] < 21.35∙density [kg/m3] – 19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket.

Polymer composition and a process for production of the polymer composition

A polyethylene composition comprising a base resin is disclosed herein. The base resin includes an ethylene homo- or copolymer fraction (A1), and an ethylene homo- or copolymer fraction (A2). Fraction (A1) has a lower weight average molecular weight than fraction (A2). The base resin has a melt flow rate MFR21 of equal to or less than 8.0 g/10 min and a density of 930 to 950 kg/m3. The polyethylene composition has a melt flow rate MFR5 of 0.01 to 0.3 g/10 min, a flow rate ratio FRR21/5 of equal to or more than 20 and a ratio of the weight average molecular weight and the number average molecular weight (Mw/Mn) of equal to or less than 30. Also the polyethylene composition has a tensile modulus of less than 1000 MPa. Also a process for the production of a polyethylene composition comprising polyethylene base resin is disclosed herein.

Jacket with improved properties

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m3 and a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa]<21.35·density [kg/m3]−19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket.

Multistage process for producing polyethylene compositions

Multistage process for producing polyethylene compositions

The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications.

Multistage process for producing polyethylene compositions

The present invention is a process for producing low density copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages in the presence of an olefin polymerization catalyst where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low density of not more than 920 kg/m 3 .

A multi-stage process for producing a c2 to c8 olefin polymer composition

The present invention relates to a multi-stage process for producing a C2 to C8 olefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a C2 to C4 olefin monomer before feeding to the polymerization process.

processo de polimerização de olefinas

PROCESSO DE POLIMERIZAÇÃO DE OLEFINAS. A presente invenção refere-se a um processo de polimerização de olefinas que compreende a polimerização de olefinas em fase gasosa num leito fluidizado na presença de um catalisador de polimerização de olefinas em um reator de polimerização que possui um corpo vertical; uma zona inferior geralmente cônica afunilada para baixo; uma zona média geralmente cilíndrica com uma razão da altura para o diâmetro L/D de pelo menos 4, acima e conectada à referida zona inferior; e uma zona superior geralmente cônica afunilada para cima acima e conectada à referida zona média em que (i) o gás de fluidização é introduzido à zona inferior do reator a partir de onde ele passa para cima através do reator; (ii) o gás de fluidização é retirado da zona superior do reator, filtrado, comprimido, arrefecido e devolvido para a zona inferior do reator; (iii) um leito fluidizado é formado no interior do reator em que as partículas de polímero em crescimento são suspensas no fluxo de gás ascendente; e (iv) não há nenhuma grelha de fluidização no reator; caracterizado pelo fato de que a velocidade do gás é mantida no reator de tal modo que NBr está dentro (...).

Procedure for the production of LLDPE resins

Procedimiento para la producción de copolímeros de etileno y, como mínimo, una alfa-olefina que tiene de 4 a 10 átomos de carbono en presencia de un catalizador de polimerización, que es un componente de catalizador de Ziegler-Natta sólido, para la polimerización de etileno, y un cocatalizador, teniendo el copolímero una densidad de 906 kg/m3 a 937 kg/m3 y un índice de fluidez MFR21, medido a 190°C bajo una carga de 21,6 kg, de 3 g/10 min a 100 g/10 min, que comprende los pasos de (A) homopolimerizar etileno o copolimerizar etileno y una primera alfa-olefina que tiene de 4 a 10 átomos de carbono en una primera etapa de polimerización en presencia del catalizador de polimerización, hidrógeno y, de manera opcional, la primera alfa-olefina, en la que la proporción molar de hidrógeno con respecto a etileno en la mezcla de reacción de fluidos de la primera etapa de polimerización es de 200 mol/kmol a 50.000 mol/kmol y la proporción molar de la primera alfa-olefina con respecto a etileno en la mezcla de reacción de fluidos de la primera etapa de polimerización es de 0 mol/kmol a 1.500 mol/kmol, para producir un primer homopolímero o copolímero de etileno; (B) introducir partículas del primer homopolímero o copolímero de etileno, que contienen el catalizador activo disperso en las mismas, junto con etileno adicional, hidrógeno y una segunda alfa-olefina que tiene de 4 a 10 átomos de carbono en una segunda etapa de polimerización y copolimerizar etileno y dicha segunda alfa-olefina que tiene de 4 a 10 átomos de carbono en una segunda etapa de polimerización en presencia del primer homopolímero o copolímero de etileno para producir una mezcla de polímeros que comprende el primer homopolímero o copolímero de etileno y un segundo copolímero de etileno, teniendo la mezcla de polímeros una densidad de 906 kg/m3 a 937 kg/m3 y un índice de fluidez MFR21 de 3 g/10 min a 150 g/10 min; (C) recuperar la mezcla de polímeros, caracterizado por que el componente de catalizador de Ziegler ...

Process for producing lldpe resins

The present invention is directed to a process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 measured at 190 °C under 21.6 kg load of from 3 to 150 g/10 min comprising the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin wherein the molar ratio of hydrogen to ethylene in the fluid reaction mixture of the first polymerisation stage is from 200 to 50000 mol/kmol and the molar ratio of the first alpha-olefin to ethylene in the fluid reaction mixture of the first polymerisation stage is from 0 to 1500 mol/kmol, to produce a first homo- or copolymer of ethylene; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the solid Ziegler-Natta catalyst to produce a polymer mixture comprising the first homo- or copolymer of ethylene and a second copolymer of ethylene, the polymer mixture having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 of from 3 to 150 g/10 min; (C) recovering the polymer mixture, characterised in that the polymerisation catalyst comprises an internal organic compound having the formula (I): wherein in the formula (I) R1 to R5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, and the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated.

process for the production of ethylene copolymers and at least one alpha olefin

a presente invenção é dirigida a um processo para a produção de copolímeros de etileno e pelo menos uma alfa-olefina possuindo de 4 a 10 átomos de carbono na presença de um catalisador de ziegler-natta sólido que compreende magnésio, titânio, halogênio e um composto orgânico interno, o copolímero tendo uma densidade de desde 906 a 937 kg/m3 e um índice de fluidez mfr21 medido a 190° c e sob uma carga de 21,6 kg de 3 a 150 g/10 min, compreendendo as etapas de (a) homopolimerizar etileno ou copolimerizar etileno e uma primeira alfa-olefina possuindo de 4 a 10 átomos de carbono em um primeiro estágio de polimerização na presença do catalisador de polimerização, hidrogênio e, opcionalmente, a primeira alfa-olefina em que a razão molar de hidrogênio para etileno na mistura fluida reacional do primeiro estágio de polimerização é de 200 a 50000 mol/kmol e a razão molar da primeira alfa-olefina para etileno na mistura de reação fluida do primeiro estágio de polimerização é de 0 a 1500 mol/kmol, para produzir um primeiro homo- ou copolímero de etileno; (b) copolimerizar etileno e uma segunda alfa-olefina possuindo de 4 a 10 átomos de carbono em um segundo estágio de polimerização na presença do primeiro homo- ou copolímero de etileno e o catalisador de ziegler-natta sólido para produzir uma mistura de polímeros que compreende o primeiro homo- ou copolímero de etileno e um segundo copolímero de etileno, a mistura de polímero possuindo uma densidade de desde 906 a 937 kg/m3 e um índice de fluidez mfr21 de desde 3 a 150 g/10 min; (c) recuperar a mistura de polímeros, caracterizado pelo fato de que o catalisador de polimerização compreende um composto orgânico interno possuindo a fórmula (i): em que na fórmula (i), r1 a r5 são iguais ou diferentes e podem ser hidrogênio, um grupo c1 a c8-alquil de cadeia linear ou ramificada, ou um grupo c3-c8-alquileno, ou dois ou mais de r1 a r5 podem formar um anel, e os dois anéis contendo oxigênio são individualmente saturados ou ...

Process for producing lldpe resins

The present invention is directed to a process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 measured at 190 °C under 21.6 kg load of from 3 to 150 g/10 min comprising the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin wherein the molar ratio of hydrogen to ethylene in the fluid reaction mixture of the first polymerisation stage is from 200 to 50000 mol/kmol and the molar ratio of the first alpha-olefin to ethylene in the fluid reaction mixture of the first polymerisation stage is from 0 to 1500 mol/kmol, to produce a first homo- or copolymer of ethylene; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the solid Ziegler-Natta catalyst to produce a polymer mixture comprising the first homo- or copolymer of ethylene and a second copolymer of ethylene, the polymer mixture having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 of from 3 to 150 g/10 min; (C) recovering the polymer mixture, characterised in that the polymerisation catalyst comprises an internal organic compound having the formula (I): wherein in the formula (I) R1 to R5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, and the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated.

Polymer composition and a process for production of the polymer composition

A polyethylene composition comprising a base resin is disclosed herein. The base resin includes an ethylene homo- or copolymer fraction (A1), and an ethylene homo- or copolymer fraction (A2). Fraction (A1) has a lower weight average molecular weight than fraction (A2). The base resin has a melt flow rate MFR21 of equal to or less than 8.0 g/10 min and a density of 930 to 950 kg/m3. The polyethylene composition has a melt flow rate MFR5 of 0.01 to 0.3 g/10 min, a flow rate ratio FRR21/5 of equal to or more than 20 and a ratio of the weight average molecular weight and the number average molecular weight (Mw/Mn) of equal to or less than 30. Also the polyethylene composition has a tensile modulus of less than 1000 MPa. Also a process for the production of a polyethylene composition comprising polyethylene base resin is disclosed herein.

Gas phase polymerization process

Polymer for cable jacket

A multimodal polyethylene composition having a lower molecular weight (LMW) ethylene homo or copolymer component (A) and a higher molecular weight ethylene copolymer component (B); wherein the LMW component comprises two fractions (ai) and (aii); wherein the polymer composition has a density of 930 kg/m3 or more (ISO1183), such as 938 to 955 kg/m3, an MFR2 (ISO1133 at 190ºC and 2.16 kg load) in the range of 0.05 to 10 g/10min, a flex modulus of up to 800 MPa (ISO 178:2010), such as 300 to 800 MPa (ISO 178:2010) and a taber abrasion resistance of 8.0 to 13.0 mg/1000 cycle (ASTM D 4060: 2014).

Process for producing polyethylene

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (I) R 1 n Si(OR 2 ) 4-n , (I) where n is an integer 0 to 3, each R 1 are equal or different and are selected among H, halogen,alkyl groups of 1 to 6 10 carbon atoms optionally substituted with one or more halogen atoms,alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the R 1 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all R 1 are not hydrogen, R 2 are equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the OR 2 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, Cl or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRR 21/5 at least 40 and/or polydispersity index PDI of at least 27.

A multi-stage process for producing a c2 to c8 olefin polymer composition

The present invention relates to a multi-stage process for producing a C 2 to C 8 olefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a C 2 to C 4 olefin monomer before feeding to the polymerization process.

Process and reactor assembly for the enhancement of hydrodynamics in a gas-solids fluidized bed reactor

A process for polymerizing olefin monomer(s) in a gas-solids olefin polymerization reactor comprising a top zone; a middle zone, which comprises a top end in direct contact with said top zone and which is located below said top zone, the middle zone having a generally cylindrical shape; and a bottom zone, which is in direct contact with a bottom end of the middle zone and which is located below the middle zone; comprising the following steps: introducing a fluidization gas stream into the bottom zone; polymerizing olefin monomer(s) in the presence of a polymerization catalyst in a dense phase formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone; introducing a jet gas stream through one or more jet gas feeding ports in a jet gas feeding area of the middle zone at the dense phase in the middle zone of the gas-solids olefin polymerization reactor; wherein the kinetic energy (E JG ) input in the reactor by the jet stream is between 1.5 and 50 times higher than the kinetic energy (E FG ) input in the reactor by the fluidization gas stream (FG).

Gas phase polymerization process

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed , cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that N Br is within the range of from 2.5 to 7.

Jacket with improved properties

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m

PROCESS FOR THE PRODUCTION OF MULTIMODAL ETHYLENE POLYMERS IN THE PRESENCE OF A POLYMERIZATION CATALYST

processo para a produção de polímeros de etileno multimodais na presença de um catalisador de polimerização. a presente invenção refere-se a um processo para a polimerização de etileno na presença de um catalisador de polimerização por copolimerização de etileno com um comonômero selecionado a partir do grupo de alfa-olefinas c4-c10 em três estágios de polimerização. os polímeros produzidos nos três estágios têm diferentes taxas de fluidez. a composição do polímero produzido pelo processo tem boas propriedades mecânicas e pode ser utilizada para a produção de tubos. o processo tem uma boa produtividade e proporciona uma operação estável e econômica. process for the production of multimodal ethylene polymers in the presence of a polymerization catalyst. the present invention relates to a process for the polymerization of ethylene in the presence of a polymerization catalyst by copolymerization of ethylene with a comonomer selected from the group of alpha-olefins c4-c10 in three stages of polymerization. the polymers produced in the three stages have different flow rates. the polymer composition produced by the process has good mechanical properties and can be used for the production of tubes. the process has a good productivity and provides a stable and economical operation.

Multimodal polyethylene copolymer

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. The multimodal polyethylene copolymer is highly suitable for the production of films providing high impact strength in the sense of high Dart drop impact strength (DDI) and low extractables. The invention further presents final articles such as films made therefrom.

Multimodal copolymer of ethylene and at least two alpha-olefin comonomers and final articles made thereof

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. Such multimodal copolymers are highly suitable for conversion processes that require a high Draw Down Ratio, like the production of thin films. Such multimodal polyethylene copolymers provide a good impact strength in the sense of a high Dart drop impact strength (DDI) and good isotropy of the films produces thereof. The invention further presents final articles such as films made therefrom.

Process for polymerising ultra-high molecular weight polyethylene

The present invention deals with a process for polymerizing ethylene in the presence of an olefin polymerization catalyst comprising titanium, magnesium and halogen in at least one polymerization stage where ethylene is polymerized in slurry, the process comprising treating the polymerization catalyst in a pre-treatment step by polymerizing an olefin on the polymerization catalyst so that the ratio of the weight of the olefin polymer to the weight of the original solid catalyst component is from 0.1 to 10 g/g and using the pre-treated catalyst in the production of ultra-high molecular weight polyethylene.

Process for the preparation of multimodal high density polyethylene

The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR 2 ) of 0.1 to 4.0 g/1O min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer having a MFR 2 from 10 to 500 g/1O min; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer, said mixture having a MFR 2 from 50 to 1000 g/1O min; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE.

Multimodal polyethylene copolymer

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. The multimodal polyethylene copolymer is highly suitable for the production of films providing high impact strength in the sense of high Dart drop impact strength (DDI) and low extractables. The invention further presents final articles such as films made therefrom.

Improved adhesive polymer composition

Gas phase polymerization process

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed, cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that N Br is within the range of from 2.5 to 7.

Multimodal polyethylene copolymer

Copolímero multimodal de etileno y al menos dos comonómeros de alfa-olefina y artículos finales hechos del mismo

Un copolímero multimodal de etileno y al menos dos comonómeros de alfa-olefina caracterizados por tener a) una densidad de 906 a 925 kg/m3 determinada de acuerdo con la norma ISO 1183, b) un MFR21 de 10 - 200 g/10 min determinado de acuerdo con ISO1133, en el que el copolímero multimodal de etileno comprende c) un primer copolímero de etileno. i) que comprende un primer comonómero de alfa-olefina que tiene de 4 a 10 átomos de carbono y ii) se caracteriza porque comprende al menos una primera y una segunda fracción del primer copolímero de etileno y el primer comonómero de alfa-olefina y d) un segundo copolímero de etileno. i) que comprende un segundo comonómero de alfa-olefina que tiene de 6 a 10 átomos de carbono, y que tiene una densidad inferior a 900 kg/m3 cuando se calcula de acuerdo con la Ecuación 5:**Fórmula** en el que ρb, ρ1 y ρ2 se refieren respectivamente a las densidades de la mezcla global b, el primer copolímero y el segundo copolímero, con base en los valores determinados de acuerdo con la norma ISO 1183; y en el que w1 y w2 se refieren respectivamente a las fracciones en peso de los copolímeros primero y segundo.

Process for the preparation of multimodal high density polyethylene

The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR2) of 0.1 to 4.0 g/10 min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer having a MFR2 from 10 to 500 g/10 min; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer, said mixture having a MFR2 from 50 to 1000 g/10 min; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE.

Process for producing polyethylene

The present invention relates to a process for producing ethylene copolymers in a multistage process comprising at least one slurry phase polymerization stage and at least one gas phase polymerization stage in the presence of Ziegler Natta catalyst comprising a solid catalyst component, a cocatalyst of a compound of group 13 metal and an external additive selected from alkoxysilanes of formula (I) R 1 n Si(OR 2 ) 4-n , (I) where n is an integer 0 to 3, each R 1 are equal or different and are selected among H, halogen,alkyl groups of 1 to 6 10 carbon atoms optionally substituted with one or more halogen atoms,alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the R 1 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, provided that all R 1 are not hydrogen, R 2 are equal or different and are selected among alkyl groups of 1 to 6 carbon atoms optionally substituted with one or more halogen atoms, alkenyl groups of 2 to 6 carbon atoms optionally substituted with one or more halogen atoms, and aryl groups of 6 to 12 carbon atoms optionally substituted with one or more halogen atoms, or the OR 2 groups can form with the Si atom they are linked to a ring of 3 to 8 ring atoms, halogen is Br, Cl or F. The invention further relates to the catalysts and use thereof in said multistage process r for producing ethylene copolymers having melt flow rate ratio FRR 21/5 at least 40 and/or polydispersity index PDI of at least 27.

Jacket with improved properties

The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m3 and a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa] < 21.35∙density [kg/m3] – 19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket.

High temperature resistant polyethylene and process for the production thereof

Inlet system for settled bed polymerization reactors

Process and reactor assembly for the enhancement of hydrodynamics in a gas-solids fluidized bed reactor

A process for polymerizing olefin monomer(s) in a gas-solids olefin polymerization reactor comprising a top zone; a middle zone, which comprises a top end in direct contact with said top zone and which is located below said top zone, the middle zone having a generally cylindrical shape; and a bottom zone, which is in direct contact with a bottom end of the middle zone and which is located below the middle zone; comprising the following steps: introducing a fluidization gas stream into the bottom zone; polymerizing olefin monomer(s) in the presence of a polymerization catalyst in a dense phase formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone; introducing a jet gas stream through one or more jet gas feeding ports in a jet gas feeding area of the middle zone at the dense phase in the middle zone of the gas-solids olefin polymerization reactor; wherein the kinetic energy (E JG ) input in the reactor by the jet stream is between 1.5 and 50 times higher than the kinetic energy (E FG ) input in the reactor by the fluidization gas stream (FG).

Inlet system for settled bed polymerization reactors

Settled bed polymerization reactor, having several inlet-levels comprising at least one inlet comprising at least one inlet per level for injection of monomer, comonomer, co-reactant and/or inert component distributed over the height of the reactor, wherein the vertical distance between two adjacent inlet-levels is equal to or lower than 0.25 x height of the reactor; and wherein the number of inlet-levels is at least [height of the reactor / 0.25 x height of the reactor] - 1; and wherein the height/diameter ratio of the reactor is larger than 3.

Multistage process for producing polyethylene compositions

process for the preparation of multimodal high density polyethylene

Trata-se de um processo para a preparação de um polietileno de alta densidade (HDPE) multimodal que tem uma taxa de fluxo de fusão (MFR2) de 0,1 a 4,0 g/1O min, sendo que o dito processo compreende: (i) polimerizar etileno em um primeiro estágio de polimerização na presença de um catalisador Ziegler-Natta para preparar um primeiro homopolímero de etileno com uma MFR2 de 10 a 500 g/1O min; (ii) polimerizar etileno em um segundo estágio de polimerização na presença do dito catalisador e do dito primeiro homopolímero de etileno para preparar uma mistura de homopolímero de etileno que compreende o dito primeiro homopolímero de etileno e um segundo homopolímero de etileno, sendo que a dita mistura tem uma MFR2 de 50 a 1.000 g/1O min; e (iii) polimerizar etileno e pelo menos um comonômero de alfa-olefina em um terceiro estágio de polimerização na presença do dito catalisador e da dita mistura de homopolímero de etileno para preparar o dito HDPE multimodal. It is a process for the preparation of a multimodal high density polyethylene (HDPE) that has a melt flow rate (MFR2) of 0.1 to 4.0 g / 10 min, with the said process comprises: (i) polymerizing ethylene in a first stage polymerization in the presence of a Ziegler-Natta catalyst for prepare a first ethylene homopolymer with an MFR2 of 10 to 500 g / 10 min; (ii) polymerize ethylene in a second stage of polymerization in the presence of said catalyst and said first ethylene homopolymer to prepare a homopolymer mixture of ethylene comprising said first ethylene homopolymer and a second ethylene homopolymer, and said mixture has an MFR2 from 50 to 1,000 g / 10 min; and (iii) polymerize ethylene and at least one alpha-olefin comonomer in a third stage of polymerization in the presence of said catalyst and said homopolymer mixture of ethylene to prepare said multimodal HDPE.

High temperature resistant polyethylene and process for the production thereof

The present invention is concerned with a polyethylene composition comprising a base resin having a density of more than 952.0 kg/m

Polymer composition and process for making the same

The present invention relates to a polymer composition, especially for pipe, and a process for making the composition. This process for making a polymer composition for pipe comprises polymerizing ethylene in at least two slurry reactors and at least one gas phase reactor connected in series, whereby the polyethylene composition comprises a) an ethylene copolymer as fraction (A), and b) an ethylene homo- or copolymer as fraction (B), with fraction (A) having a lower molecular weight than fraction (B), wherein a single-site catalyst (SSC) is used in the polymerisation of at least one of fractions (A) and/or (B), the composition having (i) a density of between 932 and 955 kg/m3, and (ii) a MFR5 (at 190°C / 5.00 kg) of between 0.5 and 3.5 g/10 min, wherein fraction (A) comprises two fractions (A1) and (A"), whereby fraction (A1) is produced in a first slurry loop reactor and fraction (A") is produced in a second loop reactor.

Multistage process for producing polyethylene compositions

The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications.

Multistage process for producing polyethylene compositions

Adhesive polymer composition

An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95% by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm 3 , and at most 0.1 vinyl groups/1000 carbon atoms. The non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent.

Multistage process for producing polyethylene compositions

A process for polymerizing ethylene in the presence of a polymerization catalyst by copolymerizing ethylene with a comonomer selected from the group of C4-C10 alpha-olefins in three polymerization stages. The polymers produced in the three stages have different melt flow rates. The polymer composition produced by the process has good mechanical properties and can be used for making pipes. The process has a good productivity and provides a stable and economic operation.

adhesive polymer composition, article and use

uma composição de polímero adesivo compreendendo um copolímero não elastomérico de etileno e um ou mais comonômeros com 3 a 10 átomos de carbono, e um elastômero são aqui divulgados. o copolímero não elastomérico está presente em uma quantidade de 60 a 95% em peso, com base na composição do polímero adesivo, tem um peso molecular médio ponderado mw de 50.000 a 80.000 g/mol, distribuição de peso molecular mw/mn de 2,0 a 5,5, densidade de 0,925-0,945 g/cm3, e no máximo 0,1 grupos vinila/1.000 átomos de carbono. o copolímero não elastomérico ou o copolímero não elastomérico e o elastômero foram graftizados com um agente de graftização ácido. an adhesive polymer composition comprising a non-elastomeric ethylene copolymer and one or more comonomers having 3 to 10 carbon atoms, and an elastomer are disclosed herein. the non-elastomeric copolymer is present in an amount of 60 to 95% by weight, based on the composition of the adhesive polymer, has a weighted average molecular weight of 50,000 to 80,000 g / mol, molecular weight distribution mw / mn of 2, 0 to 5.5, density 0.925-0.945 g / cm3, and a maximum of 0.1 vinyl groups / 1,000 carbon atoms. the non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer were graftized with an acid graftizing agent.

Polymer composition and a process for production of the polymer composition

Polymer composition and process for making the same

The present invention relates to a polymer composition, especially for pipe, and a process for making the composition. This process for making a polymer composition for pipe comprises polymerizing ethylene in at least two slurry reactors and at least one gas phase reactor connected in series, whereby the polyethylene composition comprises a) an ethylene copolymer as fraction (A), and b) an ethylene homo- or copolymer as fraction (B), with fraction (A) having a lower molecular weight than fraction (B), wherein a single-site catalyst (SSC) is used in the polymerisation of at least one of fractions (A) and/or (B), the composition having (i) a density of between 932 and 955 kg/m3, and (ii) a MFR5 (at 190°C / 5.00 kg) of between 0.5 and 3.5 g/10 min, wherein fraction (A) comprises two fractions (A1) and (A"), whereby fraction (A1) is produced in a first slurry loop reactor and fraction (A") is produced in a second loop reactor.

Jacket with improved properties

Multistage process for producing polyethylene compositions

The present invention is a process for producing low density copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages in the presence of an olefin polymerization catalyst where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low density of not more than 920 kg/m 3 .

Gas phase polymerization process

An olefin polymerization process comprising polymerizing olefins in gas phase in a fluidized bed in the presence of an olefin polymerization catalyst in a polymerization reactor having a vertical body; a generally conical downwards tapering bottom zone; a generally cylindrical middle zone having a height to diameter ratio L/D of at least 4, above and connected to said bottom zone; and a generally conical upwards tapering top zone above and connected to said middle zone wherein (i) fluidization gas is introduced to the bottom zone of the reactor from where it passes upwards through the reactor; (ii) the fluidization gas is withdrawn from the top zone of the reactor, filtered, compressed, cooled and returned into the bottom zone of the reactor; (iii) a fluidized bed is formed within the reactor where the growing polymer particles are suspended in the upwards rising gas stream; and (iv) there is no fluidization grid in the reactor; characterized in that the gas velocity is maintained in the reactor such that N Br is within the range of from 2.5 to 7.

High temperature resistant polyethylene and process for the production thereof

High temperature resistant polyethylene and process for the production thereof

The present invention is concerned with a polyethylene composition comprising a base resin having a density of more than 952.0 kg/m3 and equal to or less than 957.0 kg/m3, wherein the composition has a melt flow rate MFR5 of 0.12 to 0.21 g/10min and the polyethylene composition has a polydispersity index PI within the range of higher than 4.9 Pa-1 and equal to or less than 9.0 Pa-1. Furthermore, the present invention concerns a polyethylene composition obtainable by a multistage process, the multistage process comprising polymerizing ethylene in the presence of a silica supported Ziegler Natta catalyst in a reactor cascade comprising a first loop reactor, a second loop reactor and a gas phase reactor for obtaining the base resin and then extruding the base resin together with stabilizers and carbon black into the polyethylene composition. Furthermore, the present invention relates to an article, such as a pipe, made from the polyethylene composition and the use of the polyethylene composition for the production of such an article.

High temperature resistant polyethylene and process for the production thereof

The present invention is concerned with a polyethylene composition comprising a base resin having a density of more than 952.0 kg/m

process for the production of multimodal ethylene polymers in the presence of a polymerization catalyst

resumo processo para a produção de polímeros de etileno multimodais na presença de um catalisador de polimerização a presente invenção refere-se a um processo para a polimerização de etileno na presença de um catalisador de polimerização por copolimerização de etileno com um comonômero selecionado a partir do grupo de alfa-olefinas c4-c10 em três estágios de polimerização. os polímeros produzidos nos três estágios têm diferentes taxas de fluidez. a composição do polímero produzido pelo processo tem boas propriedades mecânicas e pode ser utilizada para a produção de tubos. o processo tem uma boa produtividade e proporciona uma operação estável e econômica. 1/ 1 Process for the production of multimodal ethylene polymers in the presence of a polymerization catalyst The present invention relates to a process for the ethylene polymerization in the presence of an ethylene copolymerization polymerization catalyst with a comonomer selected from the group alpha-olefins c4-c10 in three stages of polymerization. The polymers produced in the three stages have different flow rates. The polymer composition produced by the process has good mechanical properties and can be used for pipe production. The process has good productivity and provides stable and economical operation. 1/1

PROCESS FOR PRODUCTION OF ETHYLENE COPOLYMERS, ETHYLENE MULTIMODAL COPOLYMER AND FILM

processo para produção de copolímeros, copolímero multimodal, filme a presente invenção é um processo para produção de copolímeros de etileno e alfa-olefinas tendo de 4 a 10 átomos de carbono em três estágios de polimerização onde um copolímero de etileno de baixo peso molecular é produzido em dois dos estágios e um copolímero de alto peso molecular é produzido em um dos estágios. os copolímeros resultantes têm baixo teor de material extraível e podem ser extrudados para filmes que podem ser usados em contato com alimentos. process for producing copolymers, multimodal copolymer, film The present invention is a process for producing copolymers of ethylene and alpha-olefins having 4 to 10 carbon atoms in three stages of polymerization where a low molecular weight ethylene copolymer is produced in two of the stages and a high molecular weight copolymer is produced in one of the stages. the resulting copolymers have a low extractable material content and can be extruded into films that can be used in food contact.

Multi-phase process to produce polyethylene compositions

Procedimiento para producir copolímeros de etileno y, como mínimo, una alfa-olefina que tiene de 4 a 10 átomos de carbono en presencia de un catalizador de la polimerización, teniendo el copolímero una densidad de 906 a 925 kg/m3 y un índice de fluidez MFR5 medido a 190ºC bajo 5 kg de carga de 0,5 a 5,0 g/10 min en tres fases de polimerización, que comprende las fases de - copolimerización de etileno y una primera alfa-olefina que tiene de 4 a 10 átomos de carbono en una primera fase de polimerización en suspensión en presencia del catalizador de la polimerización para producir un primer copolímero de etileno que tiene una densidad de 945 a 955 kg/m3 y un índice de fluidez MFR2 medido a 190ºC bajo 2,16 kg de carga de 150 a 1.000 g/10 min; - copolimerización de etileno y la primera alfa-olefina en una segunda fase de polimerización en suspensión en presencia del primer copolímero de etileno para producir una primera mezcla de copolímeros que comprende el primer copolímero de etileno y un segundo copolímero de etileno, teniendo la primera mezcla de copolímeros una densidad de 945 a 955 kg/m3 y un índice de fluidez MFR2 de 150 a 1.000 g/10 min; - copolimerización de etileno y una segunda alfa-olefina que tiene de 4 a 10 átomos de carbono en una tercera fase de polimerización en fase gaseosa en lecho fluidizado en presencia de la primera mezcla de copolímeros para producir una segunda mezcla de copolímeros que comprende la primera mezcla de copolímeros y un tercer copolímero de etileno, teniendo la segunda mezcla de copolímeros una densidad de 906 a 925 kg/m3 y un índice de fluidez MFR5 de 0,5 a 5,0 g/10 min; - recuperación de la segunda mezcla de copolímeros. Process for producing copolymers of ethylene and at least one alpha-olefin having 4 to 10 carbon atoms in the presence of a polymerization catalyst, the copolymer having a density of 906 to 925 kg / m3 and a flow rate MFR5 measured at 190 ° C under 5 kg of load of 0.5 to 5.0 g / 10 min in three polymerization ...

Jacket with improved properties

Multimodal copolymer of ethylene and at least two alpha-olefin comonomers and final articles made thereof