Patent ID: 7855260

Claim:
A copolymer comprising two monomer components, wherein component a) is an olefinic unsaturated monocarboxylic acid comonomer or an ester or a salt thereof or an olefinic unsaturated sulfuric acid comonomer or a salt thereof, and component b) is a comonomer of formula (I) wherein R 1 is and wherein R 2 is H or an aliphatic hydrocarbon group having from 1 to 5 carbon atoms, R 3 is a non-substituted or substituted aryl group, and R 4 is H or an aliphatic hydrocarbon group having from 1 to 20 carbon atoms, a cycloaliphatic hydrocarbon group having from 5 to 8 carbon atoms, a substituted aryl group having from 6 to 14 carbon atoms or a compound selected from the group wherein R 5 and R 7 may each be an alkyl, aryl, aralkyl or alkaryl group and R 6 may be an alkyliden, aryliden, aralkyliden or alkaryliden group and p=0 to 3; m and n are from 2 to 4, x and y are independently and integer from 55 to 350, and z is from 1 to 200.