Patent ID: 6329472
Filing Date: 2001-12-11
Classification: A61K,A61Q,C08F,C08L

Abstract:
A water-soluble or water-dispersible graft copolymer with a K value of from 30 to 70, obtained by free-radical polymerization of monomers(A) consisting essentially of(a) from 50 to 85% by weight of monomers of the formula I ##STR6##in which R' is hydrogen or a C.sub.1 - to C.sub.6 -alkyl radical, and X is the radical ##STR7##where R"" is hydrogen or a C.sub.1 - to C.sub.6 -alkyl radical, and(b) from 15 to 30% by weight of a vinyl monomer which has at least one carboxyl group, and,(c) from 0 to 25% by weight of a free-radically polymerizable vinyl monomer of the formula II ##STR8##in which R is a C.sub.6 - to C.sub.30 -alkyl radical, and R' and X are as defined above, with(B) a prepolymer with a K value of from 30 to 50, comprising, in copolymerized form, at least 30% by weight of monomers of the formula III ##STR9##in which n is number from 1 to 3, the weight ratio A:B being from 100:5 to 100:200, and at least partial neutralization of the graft copolymer.