Patent ID: 8318880

Claim:
Anionically modified copolymers obtained by polymerization of monomers (A), (B) and (C) to yield nonionic copolymers having reactive terminal OH groups, and subsequent conversion of the terminal OH groups to anionic end groups, wherein (A) is a monomer of formula (I) wherein A is C 2 -C 4 -alkylene, B is a C 2 -C 4 -alkylene other than A, R is hydrogen or methyl, m is from 1 to 500; n is from 1 to 500, and the sum total of m+n is from 2 to 1000; (B) is an ethylenically unsaturated monomer containing an aromatic group; and (C) is an ethylenically unsaturated monomer containing an alkyl radical, and wherein the copolymer is of the formulae (IV) or (V) wherein A is C 2 -C 4 -alkylene, B is a C 2 -C 4 -alkylene other than A, R is hydrogen or methyl, m is from 1 to 500; n is from 1 to 500; and the sum total of m+n is from 2 to 1000; X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms optionally containing one or more of the hetero atoms N, O and S, Z a is H or (C 1 -C 4 )-alkyl, Z b is H or (C 1 -C 4 )-alkyl, Z c is H or (C 1 -C 4 )-alkyl; R 2 is hydrogen or methyl, Y is an aliphatic hydrocarbyl radical having 1 to 30 carbon atoms, optionally linear, branched or cyclic, and optionally contain hetero atoms O, N S or a combination thereof and optionally are unsaturated, W b is oxygen or an NH group; R 1 is hydrogen or methyl, X b is an aromatic or araliphatic radical having 3 to 30 carbon atoms optionally containing one or more of the hetero atoms N, O and S, W a is oxygen or an NH group, a=0.01 to 0.8; b=0.001 to 0.8; c=0.001 to 0.8; subject to the proviso that the sum total of a+b+c is equal to 1, Q is SO 3 , CH 2 COO, PO 3 M or sulfosuccinate, where M represents H, a monovalent metal cation, a divalent metal cation, NH 4 + , a secondary, tertiary or quaternary ammonium ion or a combination thereof.