Patent ID: 9670435
Date: 2017-06-06
CPC Classifications: C08F,C11D

Claim:
1. A copolymer which comprises, in copolymerized form, a1) 30 to 90% by weight of a monomer selected from the group consisting of acrylic acid, methacrylic acid and water-soluble salts of acrylic acid and methacrylic acid, a2) 3 to 60% by weight of 2-acrylamido-2-methylpropanesulfonic acid and water-soluble salts thereof, a3) 3 to 60% by weight of at least one nonionic monomer of the formula (I)  in which R a4) 0 to 30% by weight of one or more further ethylenically unsaturated monomers which are polymerizable with a1), a2) and a3),