05-11-2015 дата публикации
Номер: US20150315374A1
Water-redispersible polymer powders having a high proportion of base polymer are prepared by spray drying a base polymer dispersion, employing as a spraying aid, a hybrid copolymer prepared by polymerizing an ethylenically unsaturated monomer in the presence of a water soluble polymer. 112-. (canceled)14. The process for preparing a water-redispersible polymer powder of claim 13 , wherein the ethylenically unsaturated compounds used to form the base polymer particles of A) include one or more water-insoluble ethylenically unsaturated monomers whose homopolymers have a solubility in water of <10 g/l under standard conditions according to DIN50014.15. The process for preparing a water-redispersible polymer powder of claim 13 , wherein the ethylenically unsaturated compounds used to form the base polymer particles of A) include one or more ethylenically unsaturated cationic monomers.16. The process for preparing a water-redispersible polymer powder of claim 13 , wherein the ethylenically unsaturated silanes a)ii) include one or more ethylenically unsaturated silicon compounds of the formula{'br': None, 'sup': 3', '2', '4, 'sub': 0-2', '1-3, 'R—SiR(OR)\u2003\u2003(2)'}where{'sup': '2', 'sub': 1', '3', '1', '3, 'Ris a C- to C-alkyl radical, C- to C-alkoxy radical or halogen,'}{'sup': 3', '3', '5, 'sub': 2', '2', '0-1', '2', '2', '2', '1-3, 'Ris CH═CR—(CH)or CH═CRCO(CH),'}{'sup': 4', '4, 'Ris an unbranched or branched, optionally substituted alkyl radical having 1 to 12 carbon atoms or an acyl radical having 2 to 12 carbon atoms, where Ris optionally interrupted by an ether group, and'}{'sup': '5', 'sub': '3', 'Ris H or CH.'}17. The process for preparing a water-redispersible polymer powder of claim 13 , wherein one or more water-soluble polymers b) are selected from the group consisting of polysaccharides in water-soluble form claim 13 , proteins claim 13 , lignosulfonates claim 13 , formaldehydesulfonates and polymers comprising units of vinyl alcohol claim 13 , ...
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