Patent ID: 7605196

Claim:
A water-soluble, sulpho group-containing copolymer consisting essentially of at least one of a) from 3 to 96 mol % of formula (I) wherein R 1 is hydrogen or methyl, R 2 , R 3 , R 4 are independently selected from hydrogen, an aliphatic hydrocarbon radical containing 1 to 6 carbon atoms, or a phenyl radical optionally substituted by methyl group; and M is hydrogen, a monovalent or divalent metal cation, an unsubstituted ammonium ion or an ammonium ion substituted by organic radicals; and a is ½ or 1; and b) from 3 to 96 mol % of formula (II) wherein R 1 has the meaning given above, R 5 and R 6 are independently selected from hydrogen, an aliphatic hydrocarbon radical containing 1 to 20 carbon atoms, a cycloaliphatic hydrocarbon radical containing 5 to 8 carbon atoms or an aryl carbon radical containing 6 to 14 carbon atoms, and c) from 0.01 to 10 mol % of the structural groups of formula (III) wherein Y is —COO(C n H 2n O) p —R 7 , —(CH 2 ) q —O(C n H 2n O) p —R 7 ; R 7 is or an unsaturated or saturated, linear or branched aliphatic alkyl radical containing 10 to 40 carbon atoms, R 8 is H, C 1 to C 6 alkyl, arylalkyl group containing a C 1 to C 12 alkyl and C 6 to C 14 aryl radical, n is from 2 to 4, p is from 0 to 200, q is from 0 to 20, x is from 0 to 3 and R 1 has the meaning given above, or d) from 0.1 to 30 mol % of the structural groups of formula (IV) wherein Z is —(CH 2 ) q —O(C n H 2n O) p —R 9 , R 9 is H or a C 1 to C 4 alkyl; and R 1 , n, p and q have the meaning given above.