VERFAHREN ZUR STRAHLENBEHANDLUNG VON ETHYLENPOLYMEREN

Multimodale Polyethylenzusammensetzung für Rohre

Rohr mit gegen extrem langsames Risswachstum beständigem Polyethylen

PRESSURE-FREE PIPE CONTAINING A MULTIMODALE POLYETHYLENE COMPOSITION AND AN INORGANIC FILLER

POLYETHYLENE RESIN WITH CLOSE PARTICLE SIZE DISTRIBUTION

MULTIMODALE POLYETHYLENE COMPOSITION FOR PIPES WITH INCREASED FLEXIBILITY

POLYOLEFIN COMPOSITION WITH IMPROVED RESISTANCE OPPOSITE CIO2-ENTHALTENDEN WATER

Multimodal polyethylene composition with improved homogeneity

POLYMERZUSAMMENSETZUNG FÜR ROHRE

POLYMER COMPOSITION FOR PIPES

POLYMER COMPOSITION FOR PIPES

PROCEDURE FOR THE RADIATION TREATMENT OF ETHYL POLYMERS

POLYMER COMPOSITIONS WITH IMPROVED HOMOGENEITY AND IMPROVED SMELL, PROCEDURES FOR THEIR PRODUCTION AND FROM IT MANUFACTURED PIPES

POLYMER COMPOSITION FOR INJECTION MOULDING PROCEDURES

PIPE ALSO AGAINST EXTREME SLOW CRACK GROWTH STEADY POLYETHYLENE

POLYMER COMPOSITION FOR PIPES

Pipe comprising super slow crack growth resistant polyethylene

POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH ENHANCED FLEXIBILITY

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A)has a lower weight average molecular weight than fraction (B); (ii) the base resin has a density of 932 to 938 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.6 g/10 min; and (iv) the polyethylene composition has a shear stress .eta.2.7 kPa of 85 to 230 kPas. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

Multimodale Polyethylenzusammensetzung für Rohre

MULTIMODALE POLYETHYLENE COMPOSITION FOR PIPES

MULTIMODALE POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

A PRESSURE-FREE POLYMER PIPE

Polymer composition

Multimodale Polyethylenzusammensetzung mit verbesserter Homogenität

MULTIMODALE POLYETHYLENE COMPOSITION FOR PIPES WITH INCREASED FLEXIBILITY

MULTIMODALE POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

PRESSURE PIPE CONTAINING A MULTIMODALE POLYETHYLENE COMPOSITION AND AN INORGANIC FILLER

POLYMER COMPOSITIONS AND OF IT MAKING PRINTINGRESISTANT PIPES

PIPE COMPRISING SUPER SLOW CRACK GROWTH RESISTANT POLYETHYLENE

A pipe or a supplementary pipe article comprising a polyethylene composit ion comprising a base resin which comprises: (A) a first ethylene homo- or c opolymer fraction having an MFR2 in the range of 300 to 700 g/10 min, and (B ) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), wherein the base resin has a density in the range of 0.945 to 0.949 kg/cm3 and an MFR5 in the range of 0.2 to 0.4 g/10 min and a comonomer content of higher than 2.0 wt.-% and a SHI(2.7/210) in the range of 55 to 100.

MULTIMODAL POLYETHYLENE COMPOSITION FOR PIPES

Polyolefinzusammensetzung mit verbesserter Resistenz gegenüber CIO2-enthaltenden wasser

Polyethylene composition for pressure pipes with enhanced flexibility

Polymer compositions having improved homogeneity and odour, a method for making them and pipes made thereof

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 960 kg/m, a melt index MFR of from 0.5 to 6.0 g/10 min, a melt index MFR of from 0.1 to 2.0 g/10 min and a shear thinning index SHI of from 2 to 50. The compositions further have a level of volatile compounds of at most 100 ppm by weight and/or a homogeneity rating of at most 3. In addition the multimodal copolymer comprises: (A) from 35 to 60 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m; and (B) from 40 to 65 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 935 kg/m.

COATED PIPES HAVING IMPROVED MECHANICAL PROPERTIES AND A METHOD OF PRODUCTION THEREOF

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 6 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m3 to 955 kg/m3. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

PIPE COMPRISING SUPER SLOW CRACK GROWTH RESISTANT POLYETHYLENE

A pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises: (A) a first ethylene homo- or copolymer fraction having an MFR2 in the range of 300 to 700 g/10 min, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), wherein the base resin has a density in the range of 0.945 to 0.949 kg/cm3 and an MFR5 in the range of 0.2 to 0.4 g/10 min and a comonomer content of higher than 2.0 wt.-% and a SHI(2.7/210) in the range of 55 to 100.

Multimodale Polyethylenzusammensetzung für Rohre mit erhöhter Flexibilität

POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH ENHANCED FLEXIBILITY

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A )has a lower weight average molecular weight than fraction (B); (ii) the bas e resin has a density of 932 to 938 kg/m3; (iii) the polyethylene compositio n has an MFR5 of 0.1 to 0.6 g/10 min; and (iv) the polyethylene composition has a shear stress .eta.2.7 kPa of 85 to 230 kPas. Furthermore, the present invention relates to an article, preferably a pipe comprising said compositi on and to the use of said composition for the production of an article, pref erably a pipe.

Pressure pipe comprising a multimodal polyethylene composition with an inorganic filler

Pressure pipe comprising a multimodal polyethylene composition with an inorganic filler

The present invention relates to a pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises (A) a first ethylene homopolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), and the composition further comprises (C) an inorganic mineral filler, wherein inorganic mineral filler (C) is present in the composition in an amount of 1 to 70 wt. %, and to the use of said composition for the production of a pipe or a supplementary pipe article.

Polymer compositions and pressure-resistant pipes made therefrom

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 935 kg/m, a melt index MFR of from 0.5 to 6.0 g/10 min, a melt index MFR of from 0.1 to 2.0 g/10 min and a shear thinning index SHI of from 2 to 50. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m.

PROCESS FOR COATING A PIPE WITH HIGH THROUGHPUT USING MULTIMODAL ETHYLENE COPOLYMER, AND COATED PIPES OBTAINED THEREOF

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/M3 to 955 kg/m3 . The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Polyethylene composition for pressure pipes with enhanced flexibility

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower weight average molecular weight than fraction (B); (ii) the base resin has a density of 932 to 938 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.6 g/10 min; and (iv) the polyethylene composition has a shear stress 2.7 kPa of 85 to 230 kPas. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

Polyethylene composition for pressure pipes with enhanced flexibility

POLYMER COMPOSITIONS AND PRESSURE-RESISTANT PIPES MADE THEREFROM

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethy-lene copolymer has a density of from 924 to 935 kg/m3, a melt index MFR5 of from 0.5 to 6.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 50. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 car-bon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m3; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m3.

COATED PIPES HAVING IMPROVED MECHANICAL PROPERTIES AND A METHOD OF PRODUCTION THEREOF

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 6 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m3 to 955 kg/m3. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Multimodale Polyethylenzusammensetzung für Rohre mit erhöhter Flexibilität

Multimodale Polyethylenzusammensetzung mit verbesserter Homogenität

Druckrohr enthaltend eine multimodale Polyethylenzusammensetzung und anorganischen Füllstoff

Polyolefin composition with increased resistance to CIO2-containing water

The present invention relates to a polyolefin composition comprising a polyolefin base resin and an antioxidant, characterized in that said polyolefin composition has a lifetime of at least 200 h in a test measuring the resistance against ClO-containing water at 90°C and at a concentration of ClO of 4 ppm wherein the equipment used is according to ASTM F2263-03. The present invention further relates to a pipe comprising the polyolefin composition according to the invention, to the use of the polyolefin composition for the production of a pipe, and to the use of a particularly selected antioxidant for increasing the resistance of a polyolefin composition against degradation caused by contact with ClO-containing water.

HIGH DENSITY POLYMER COMPOSITIONS, A METHOD FOR THEIR PREPARATION AND PRESSURE-RESISTANT PIPES MADE THEREFROM

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 937 to 950 kg/m3, a melt index MFR5 of from 0.3 to 3.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 30. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 960 to 977 kg/m3; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m3.

Polyolefin composition with increased resistance to CIO2-containing water

The present invention relates to a polyolefin composition comprising a polyolefin base resin and an antioxidant, characterized in that polyolefin composition has a lifetime of at least 200 h in a test measuring the resistance against ClO2-containing water at 90 DEG C and at a concentration of ClO2 of 4 ppm wherein the equipment used is according to ASTM F2263-03. The present invention further test measuring the resistance against ClO2-containing water at 90 DEG C and at a concentration of ClO2 of 4 ppm wherein the equipment used is according to ASTM F2263-03. The present invention further relates to a pipe comprising the polyolefin composition according to the invention, to the use of the polyolefin composition for the production of a pipe, and to the use of a particularly selected antioxidant for increasing the resistance of a polyolefin composition against degradation caused by contact with ClO2-containing water.

POLYMERZUSAMMENSETZUNG FÜR ROHRE

Polyethylenharz mit enger Korngrössenverteilung

POLYMER COMPOSITION FOR PIPES

Pipes having a design stress of at least 9.0 MPa are produced by using a new bimodal polyethylene composition of particular properties compounded with carbon black. © KIPO & WIPO 2007 ...

Coated pipes having improved mechanical properties at elevated temperatures and a method of production thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol and a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 945 kg/m3 to 958 kg/m3. The coatings have a high stiffness, good properties at elevated temperatures and acceptable stress-cracking properties.

Polyethylene resin with narrow particle size distribution

The present invention relates to a polyethylene resin comprising A) a first ethylene homo- or copolymer fraction, and B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), characterized in that the polymer resin powder obtained directly after the final polymerisation step has a particle size distribution PSD 95/5 equal to or smaller than 12. Furthermore, the invention relates to a process for the production of a polymer composition comprising: (i) a step in which ethylene monomers, and optionally further alpha-olefin-comonomers, are polymerised in liquid phase in the presence of a polymerisation catalyst, (ii) a step in which ethylene monomers, and optionally further alpha-olefin comonomers, are polymerised in the gas phase in the presence of a polymerisation catalyst, and (iii) obtaining a polymer resin powder after the final polymerisation step wherein the powder has a particle size distribution PSD 95/5 equal to or smaller than 12.

MULTIMODAL POLYETHYLENE COMPOSITION FOR PIPES

The present invention relates to a multimodal polyethylene composition for pipes which comprises polyethylene composition comprising a base resin which comprises (A) an ethylene homo- or copolymer fraction, and (B) an ethylene copolymer fraction comprising at least one alphaolefin comonomer having at least 4 carbon atoms, wherein (i) fraction (A) has a lower average molecular weight than fraction (B), and (ii) the comonomer content and the density d of the base resin satisfy the following relation: comonomer [mol %]>-0.0612 d [kg/m3] mol %/(kg/m3)+58.6, and (iii) the base resin comprises mom than 0.5 mol % of at least one alpha-olefin comonomer having at leant 4 carbon atoms. Furthermore, the present invention relates to a process for the production or said composition, a pipe comprising said composition and to the use of said composition for the production of a pipe.

Multimodale Polyethylenzusammensetzung mit verbesserter Homogenität

Polyethylene composition for pressure pipes with enhanced flexibility

Multimodale Polyethylenzusammensetzung mit verbesserter Homogenität

Polymerzusammensetzung für Spritzgussverfahren

POLYMER COMPOSITION FOR PIPES

A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm 3 , an MFR 5 of 0.2-1.2 g/10 min, and M n of 8000-15000, an M w of 180-330 x 10 3 , and an M w /M n of 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55) : (65-45). © KIPO & WIPO 2007 ...

Pressureless pipe comprising a multimodal polyethylene composition with an inorganic filler

The present invention relates to a pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), the base resin has a flexural modulus determined according to ISO 178 of 1000 MPa or higher, and the composition further comprises (C) an inorganic mineral filler, wherein inorganic mineral filler (C) is present in the composition in an amount of 1 to 70 wt. %, and to the use of said composition for the production of a pipe or a supplementary pipe article.

Pipe comprising super slow crack growth resistant polyethylene

A pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises: (A) a first ethylene homo- or copolymer fraction having an MFR2 in the range of 300 to 700 g/10 min, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), wherein the base resin has a density in the rangeof 0.945 to 0.949 kg/cm<3> and an MFR5 in the range of 0.2 to 0.4 g/10 min and a comonomer content of higher than 2.0 wt.-% and a SHI(2.7/210) in the range of 55 to 100.

POLYMERZUSAMMENSETZUNG FÜR ROHRE

POLYMERZUSAMMENSETZUNG FÜR ROHRE

Druckloses Rohr enthaltend eine multimodale Polyethylenzusammensetzung und anorganischer Füllstoff

Polymerzusammensetzung für Spritzgussverfahren

Druckrohr enthaltend eine multimodale Polyethylenzusammensetzung und anorganischen Füllstoff

POLYMER COMPOSITION FOR PIPE

PROBLEM TO BE SOLVED: To provide a polymer pipe having design stress of at least 9.0 MPa and having excellent workability, impact strength, elastic modulus, resistance to fast crack propagation and resistance to slow crack growth. SOLUTION: In this polymer composition, a specified polyethylene composition composed of 1-8 wt.% of carbon black having resistance to the slow crack growth and 92-99 wt.% of bimodal ethylene polymer and having MFR (Melt Flow Rate) in the range of 0.15-0.40g/10 min and density in the range of 955-965 kg/m3 is used. COPYRIGHT: (C)2012,JPO&INPIT ...

VERFAHREN ZUR STRAHLENBEHANDLUNG VON ETHYLENPOLYMEREN

Polymerzusammensetzung für Rohre

POLYMERZUSAMMENSETZUNG FÜR ROHRE

Polymer composition for pipes

A multimodal polymer composition for pipes is disclosed as well as a pipes made thereof. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm3, and a viscosity at a shear stress of 747 Pa (eta747 Pa) of at least 650 Pa.s, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65-45). Preferably, the multimodal polyethylene has a viscosity at a shear stress of 2.7 kPa (eta2.7 kPa) of 260-450 kPa.s; and a shear thinning index (SHI) defined as the ratio of the viscosities at shear stresses of 2.7 and 210 kPa, respectively, of SHI27/210=50-150, and a storage modulus (G') at a loss modulus (G'') of 5 kPa, of G'5 kPa>=3000 Pa. The pipe is made of the multimodal polymer composition and withstands a stress of 8.0 MPa gauge during 50 years at 20° C. (MRS8.0). Preferably, the pipe ...

Polymerzusammensetzung für Rohre

Pressureless polymer pipe

A pressureless pipe and polymer composition for making such a pipe as well as the use of the polymer composition for pressureless pipes and supplementary parts, are disclosed. The polymer composition is characterized in that the polymer comprises a multimodal ethylene polymer including a copolymer of ethylene and a C4-C10 -olefin comonomer; the ethylene polymer has a total density of 953-958 kg/m3 and a MFR5 of 0.2-2.0 g/10 min; the ethylene polymer has a modulus of elasticity, determined according to ISO 178 of 1300-1700 MPa; the ethylene polymer has a resistance to slow crack growth, determined according to ASTM F 1473 of more than 1.5 hrs.

Polyethylene composition for pressure pipes with enhanced flexibility

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m 3 ; (iii) the polyethylene composition has an MFR 5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI (2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

POLYMER COMPOSITION FOR PIPES

A multimodal polymer composition for pipes is disclosed as well as a pipe made thereof. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm, and a viscosity at a shear stress of 747 Pa (η) of at least 650 Pa.s, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65-45). Preferably, the multimodal polyethylene has a viscosity at a shear stress of 2.7 kPa (η) of 260-450 kPa.s; and a shear thinning index (SHI) defined as the ratio of the viscosities at shear stresses of 2.7 and 210 kPa, respectively, of SHI=50-150, and a storage modulus (G') at a loss modulus (G'') of 5 kPa, of G'≥3000 Pa. The pipe is made of the multimodal polymer composition and withstands a stress of 8.0 MPa gauge during 50 years at 20°C (MRS8.0). Preferably, the pipe has a rapid crack propagation ...

A pressureless polymer pipe

MULTIMODAL POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

The present invention concerns a multimodal polyethylene composition comprising a base resin comprising three ethylene homo- or copolymer fractions (A), (B) and (C) with different weight average molecular weight Mw, wherein a) fraction (A) has an MFR21 equal or lower than 20 g/10 min, b) fraction (B) has a lower weight average molecular weight than fraction (C), c) fraction (C) has a lower weight average molecular weight than fraction (A), d) the composition has a viscosity at a shear stress of 747 Pa (eta747) of 350 kPas or higher, and e) the composition has a MFR5 of 0.15 g/10 min or higher and a white spot area of 1% or below. Furthermore, the present invention relates to a process for the production of such a composition as well as to the use of such a composition for the production of a pipe, for moulding applications, and wire and cable applications.

Polyethylene composition with broad molecular weight distribution and improved homogeneity

The present application relates to a polyethylene composition comprising a base resin having a density of at least 948 kg/m3, wherein the composition has a shear thinning index SHI(2.7/210), being the ratio of the viscosity at a complex modulus of 2.7 kPa and of 210 kPa, of 55 or more and 105 or less and a viscosity at a shear stress of 747 Pa, eta747 Pa, of 450 kPas or more, a process for the production of said polyethylene composition, an article comprising said polyethylene composition and the use of said polyethylene composition for the production of an article.

MULTIMODAL POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

Pipe comprising super slow crack growth resistant polyethylene

A pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises: (A) a first ethylene homo- or copolymer fraction having an MFR2 in the range of 300 to 700 g/10 min, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), wherein the base resin has a density in the range of 0.945 to 0.949 kg/cm3 and an MFR5 in the range of 0.2 to 0.4 g/10 min and a comonomer content of higher than 2.0 wt.-% and a SHI(2.7/210) in the range of 55 to 100.

Coated Pipes Having Improved Mechanical Properties at Elevated Temperatures and a Method of Production Thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol and a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 945 kg/m3 to 958 kg/m3. The coatings have a high stiffness, good properties at elevated temperatures and acceptable stress-cracking properties.

Polyethylene composition for pressure pipes with enhanced flexibility

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI(2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m3 to 955 kg/m3. Further, the multimodal ethylene copolymer comprises the multimodal ethylene copolymer comprises from 49 to 59 % based on the weight of the multimodal ethylene copolymer a low molecular weight ethylene homopolymer component, said low molecular weight ethylene homopolymer having a weight average molecular weight of from 5000 g/mol to 70000 g/mol; and from 51 to 41 % based on the weight of the multimodal ethylene copolymer a high molecular ...

POLYMER COMPOSITION FOR INJECTION MOLDING

POLYETHYLENE RESIN WITH NARROW PARTICLE SIZE DISTRIBUTION

Polymer composition for pipes

A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm<3>, an MFR5 of 0.2-1.2 g/10 min, an Mn of 8000-15000, an Mw of 180-330x10<3>, and an Mw/Mn of 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65:45).

PRESSURE PIPE COMPRISING A MULTIMODAL POLYETHYLENE COMPOSITION WITH AN INORGANIC FILLER

MULTIMODAL POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

Polymer compositions and pressure-resistant pipes made therefrom

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 935 kg/m3, a melt index MFR5 of from 0.5 to 6.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 50. In addition the multimodal copolymer comprises: (A) from 30 to 70% by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 945 to 975 kg/m3; and (B) from 30 to 70% by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or ...

Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m3 to 955 kg/m3. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Multimodal polyethylene composition with improved homogeneity

MULTIMODAL POLYETHYLENE COMPOSITION WITH IMPROVED HOMOGENEITY

The present invention in a first embodiment concerns a multimodal, preferably bimodal, polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR2 of fraction (A) and the MFR5 of the base resin being from 200 to 1500, and the composition has a white spot area of 1% or below. In a second embodiment, the present invention concerns a polyethylene composition comprising a base resin comprising (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR2 of fraction (A) and the MFR5 of the base resin being from 200 to 1500, and the composition has a rating in the ISO 18553 white spot rating test of below 4.5. Furthermore, the present invention relates to a process ...

High density polymer compositions, a method for their preparation and pressure-resistant pipes made therefrom

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 937 to 950 kg/m3, a melt index MFR5 of from 0.3 to 3.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 30. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to100000 g/mol and a density of from 960 to 977 kg/m3; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or ...

POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH ENHANCED FLEXIBILITY

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower average molecular weight than fraction (B); (ii) the base resin has a density of 940 to 947 kg/m3; (iii) the polyethylene composition has an MFR5 of 0.1 to 0.5 g/10 min; and (iv) the polyethylene composition has an SHI(2.7/210) of 10 to 49. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

Polyethylene composition, product containing same and its uses

The present invention relates to a polyethylene composition comprising a base resin which comprises (a) an ethylene homo- or copolymer fraction (A); and (b) an ethylene homo- or copolymer fraction (B), wherein (i) fraction (A) has a lower weight average molecular weight than fraction (B); (ii) the base resin has a density of 932 to 938 kg/m 3 ; (iii) the polyethylene composition has an MFR 5 of 0.1 to 0.6 g/10 min ; and (iv) the polyethylene composition has a shear stress 2.7 kPa of 85 to 230 kPas. Furthermore, the present invention relates to an article, preferably a pipe comprising said composition and to the use of said composition for the production of an article, preferably a pipe.

PIPE COMPRISING SUPER SLOW CRACK GROWTH RESISTANT POLYETHYLENE

A pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises: (A) a first ethylene homo- or copolymer fraction having an MFR2 in the range of 300 to 700 g/10 min, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), wherein the base resin has a density in the range of 0.945 to 0.949 kg/cm3 and an MFR5 in the range of 0.2 to 0.4 g/10 min and a comonomer content of higher than 2.0 wt.-% and a SHI(2.7/210) in the range of 55 to 100.

Multimodal polyethylene composition for pipes

Multimodal polyethylene composition for pipes

A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm<3>, an MFR5 of 0.2-1.2 g/10 min, an Mn of 8000-15000, an Mw of 180-330x10<3>, and an Mw/Mn of 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65:45).

Polymer composition for pipes

A multimodal polymer composition for pipes is disclosed as well as a pipes made thereof. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm3, and a viscosity at a shear stress of 747 Pa (eta747 Pa) of at least 650 Pa.s, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65-45). Preferably, the multimodal polyethylene has a viscosity at a shear stress of 2.7 kPa (eta2.7 kPa) of 260-450 kPa.s; and a shear thinning index (SHI) defined as the ratio of the viscosities at shear stresses of 2.7 and 210 kPa, respectively, of SHI27/210=50-150, and a storage modulus (G') at a loss modulus (G'') of 5 kPa, of G'5 kPa>=3000 Pa. The pipe is made of the multimodal polymer composition and withstands a stress of 8.0 MPa gauge during 50 years at 20° C. (MRS8.0). Preferably, the pipe has a rapid crack propagation (RCP) S4-value, determined according to ISO 13477:1997(E), of -5° C. or lower and a slow crack propagation resistance, determined according to ISO 13479:1997, of at least 500 hrs at 4.6 MPa/80° C. The polymer composition affords good non-sagging properties to pipe made thereof.

A multimodal polyethylene polymer composition and its use in the production of pipes

The invention relates to novel multimodal polyethylene polymers comprising a low molecular weight fraction and a high molecular weight fraction, and having a MFR5 of greater than 0.10 g/10 min and less than or equal to 0.22 g/10 min, and a density of greater than equal to 952 kg/m3. The invention also relates to uses of the novel polymers in the production of polymeric articles, especially pipes.

Multimodal polyethylene composition with improved homogeneity

The present invention concerns a multimodal polyethylene composition comprising a base resin comprising three ethylene homo- or copolymer fractions (A), (B) and (C) with different weight average molecular weight M w , wherein a) fraction (A) has an MFR 21 equal or lower than 20 g/10 min, b) fraction (B) has a lower weight average molecular weight than fraction (C), c) fraction (C) has a lower weight average molecular weight than fraction (A), d) the composition has a viscosity at a shear stress of 747 Pa (eta 747 ) of 350 kPas or higher, and e) the composition has a MFR 5 of 0.15 g/10 min or higher and a white spot area of 1 % or below. Furthermore, the present invention relates to a process for the production of such a composition as well as to the use of such a composition for the production of a pipe, for moulding applications, and wire and cable applications.

Multimodal polyethylene composition with improved homogeneity

The present invention in a first embodiment concerns a multimodal, preferably bimodal, polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR 2 of fraction (A) and the MFR 5 of the base resin being from 200 to 1500, and the composition has a white spot area of 1 % or below. In a second embodiment, the present invention concerns a polyethylene composition comprising a base resin comprising (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR 2 of fraction (A) and the MFR 5 of the base resin being from 200 to 1500, and the composition has a rating in the ISO 18553 white spot rating test of below 4.5. Furthermore, the present invention relates to a process for the production of said compositions as well as to the use said compositions for the production of an article, in particular a pipe.

Multimodal polyethylene composition for pipes

The present invention relates to a multimodal polyethylene composition for pipes which comprises polyethylene composition comprising a base resin which comprises (A) an ethylene homo- or copolymer fraction, and (B) an ethylene copolymer fraction comprising at least one alphaolefin comonomer having at least 4 carbon atoms, wherein (i) fraction (A) has a lower average molecular weight than fraction (B), and (ii) the comonomer content and the density d of the base resin satisfy the following relation: comonomer [mol %]>−0.0612 d [kg/m 3 ] mol %/(kg/m 3 )+58.6, and (iii) the base resin comprises mom than 0.5 mol % of at least one alpha-olefin comonomer having at leant 4 carbon atoms. Furthermore, the present invention relates to a process for the production or said composition, a pipe comprising said composition and to the use of said composition for the production of a pipe.

High density polymer compositions, a method for their preparation and pressure-resistant pipes made therefrom

The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 937 to 950 kg/m, a melt index MFR of from 0.3 to 3.0 g/10 min, a melt index MFR of from 0.1 to 2.0 g/10 min and a shear thinning index SHI of from 2 to 30. In addition the multimodal copolymer comprises: (A) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a low molecular weight ethylene polymer selected from ethylene homopolymer and a copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 5000 to 100000 g/mol and a density of from 960 to 977 kg/m; and (B) from 30 to 70 % by weight, based on the combined amount of components (A) and (B), of a high molecular weight copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms and having a weight average molecular weight of from 100000 to 1000000 g/mol and a density of from 890 to 929 kg/m.

Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR of from 0.05 g/10 min to 5 g/10 min, a melt index MFR of from 0.5 to 10 g/10 min and a density of from 930 kg/m to 955 kg/m. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Polymer compositions having improved homogeneity and odour, a method for making them and pipes made thereof

High density polymer compositions, a method for their preparation and pressure-resistant pipes made therefrom

Polymer compositions and pressure-resistant pipes made therefrom

Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/M3 to 955 kg/m3 . The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Coated pipes having improved mechanical properties at elevated temperatures and a method of production thereof

Polymer composition for pipes

Polyolefin composition with increased resistance to CIO2-containing water

POLYMER COMPOSITION AND METHOD FOR PIPE AND PIPE PRODUCTION

A multimodal polyethylene polymer composition and its use in the production of pipes

The invention relates to novel multimodal polyethylene polymers comprising a low molecular weight fraction and a high molecular weight fraction, and having a MFR5 of greater than 0.10 g/10 min and less than or equal to 0.22 g/10 min, and a density of greater than equal to 952 kg/m3. The invention also relates to uses of the novel polymers in the production of polymeric articles, especially pipes.

WATER-RESISTANT POLOLEFINE COMPOSITION WITH CLO2

Druckloses rohr enthaltend eine multimodale polyethylenzusammensetzung und anorganischer füllstoff

Rohr mit gegen extrem langsames risswachstum beständigem polyethylen

Multimodale polyethylenzusammensetzung für rohre mit erhöhter flexibilität

Polymerzusammensetzung für rohre

Polymerzusammensetzung für rohre

Multimodale polyethylenzusammensetzung mit verbesserter homogenität

Polymerzusammensetzung für spritzgussverfahren

Transparent, steriliserbar emballasje av plast.

Multimodale polyethylenzusammensetzung für rohre

Polymerzusammensetzungen mit verbesserter homogenität und verbessertem geruch, verfahren zu deren herstellung und daraus hergestellte rohre

Polymerzusammensetzungen und daraus hergestellte druckresistente rohre

Multimodale polyethylenzusammensetzung für rohre mit erhöhter flexibilität

Verfahren zur strahlenbehandlung von ethylenpolymeren

Druckrohr enthaltend eine multimodale polyethylenzusammensetzung und anorganischen füllstoff

Polyethylenharz mit enger korngrössenverteilung

Ein druckloses polymerrohr

Multimodale polyethylenzusammensetzung mit verbesserter homogenität

Polymerzusammensetzung für rohre

Polyolefinzusammensetzung mit verbesserter resistenz gegenüber cio2-enthaltenden wasser

Transparent steriliserbar emballage af plast