Patent ID: 6528590
Filing Date: 2003-03-04
Classification: C08F

Abstract:
An aqueous copolymer dispersion consisting essentially of:A) an aqueous dispersion of a copolymer having a solids fraction of from 20 to 65% by weight, said copolymer being composed of a) from 40 to 99.9% by weight of at least one ester of, -monoethylenically unsaturated carboxylic acids containing 3 to 6 carbon atoms and alkanols containing 1 to 18 carbon atoms and from 0 to 40% by weight of at least one vinylaromatic compound (monomers a), b) from 0.05 to 10% by weight of at least one, -monoethylenically unsaturated mono- or dibasic acid containing 3 to 8 carbon atoms, and/or anhydrides thereof, and from 0 to 10% by weight of at least one, -monoethylenically unsaturated carboxamide which contains 3 to 8 carbon atoms and can be substituted once or twice on the nitrogen by alkyls, alkanols, alkyl sulfates or alkyl ether sulfates containing up to 5 carbon atoms (monomers b), c) from 0.05 to 10% by weight of at least one monoethylenically unsaturated crosslinking monomer (monomers c) whereby at least one of the crosslinking monomers c is silane of the formula CH2&boxH;CHâ€”Si(OX)3, a silane of the formula CH2&boxH;CZâ€”COOâ€”Yâ€”Si(OX)3 or an ethylenically unsaturated derivative of glycidol, in which X is a hydrogen atom, an acyl group or an alkyl group having not more than three carbon atoms, Z is a hydrogen atom or a methyl and/or ethyl group, Y is a group CnH2n where n=2 to 6, and d) from 0 to 30% by weight of at least one other copolymerizable monoethylenically unsaturated monomer (monomers d), in copolymerized form, the weight fractions of the monomers a, b, c and d being chosen within the stated limits such that a synthetic resin composed of these monomers alone would have a glass transition temperature in the range from âˆ’50 to 35Â° C., B) from 0 to 10% by weight, based on the copolymer A, of benzophenone, acetophenone, one or more acetophenone derivatives or benzophenone derivatives without an ethylenically unsaturated group, or a mixture thereof, C) from 0.3 to 10% by weight, based on the copolymer A, of emulsifiers, D) from 0 to 5% by weight, based on the copolymer A, of protective colloids, and wherein the aqueous dispersion does not comprise a compound containing hydrazide groups.