Patent ID: 6964995

Claim:
A water-soluble or water-swellable grafted comb copolymer obtained by free-radical copolymerization of A) acryloyldimethyltaurine or acryloyldimethyltaurates or mixtures thereof, B) optionally, one or more other olefinicaily unsaturated, comonomer containing at least one oxygen, nitrogen, sulfur or phosphorus atom and possessing a molecular weight of less than 500 g/mol, C) one or more macromonomer of fomula (II) in which R 3 , R 4 , R 5 , and R 6 independently of one another denote hydrogen, n-alliphatic, iso-alliphatic, cycloalliphatic, olefinic, arylalliphatic and/or aromatic radicals having a carbon number of from 1 to 30, Y is a bridging group, and v and w independently of one another are from 0 to 500, the sum of v and w being on average ≧1; D) the copolymerization taking place in the presence of at least one polymeric additive having a number-average molecular weight of from 200 g/mol to 10 9 g/mol to provide graft copolymerization.