Patent ID: 7838603

Claim:
Graft copolymers P based on polyoxyalkylene-polysiloxane block polymers S of the general formula (V) where the radical A is a polyoxyalkylene block of the average formula (VI), [(C 2 H 4-d R′ d O) n (C x H 2x O) r (C 2 H 4-d R″ d O) t ] (VI) where d is from 1 to 3, n is ≧0, x is from 2 to 10, r is ≧0, t is ≧0, n+r+t is ≧1, and R′ is a monovalent aromatic, optionally substituted hydrocarbon radical, R″ is a hydrogen radical or a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, R 1 is a hydrogen atom, a monovalent organic linear or branched alkyl radical of chain length C 1 -C 40 or a carboxyl radical or an optionally branched alkyl or aryl ester, (VIII) where the R 1 , A, B radicals and m, p and q are each as defined above and C is a linear or branched alkylene radical having from 2 to 20 carbon atoms wherein the graft copolymers P are prepared by free radical graft polymerization of ethylenically unsaturated monomers M in the presence of polyoxyalkylene-polysiloxane block polymers of the formula (VIII); wherein the monomers M are selected from the group of acrylic acid, methacrylic acid, vinyl ethers, vinyl alcohols, vinyl esters, styrene, methyl styrene, tert-butylstyrene, and mixtures and derivatives thereof; and wherein the graft copolymers P further include derivatives of acrylic acid and methacrylic acid of the general formula (I), X—C(O)CR 7 ═CHR 6 (I) where X is selected from the group of the OH, OL, OR 8 , NH 2 , NHR 8 , N(R 8 ) 2 radicals, R 7 and R 6 are each independently selected from the group consisting of —H, C 1 -C 8 linear or branched alkyl chains, methoxy, ethoxy, 2-hydroxyethoxy, 2-methoxyethoxy and 2-ethoxyethyl, R 8 are C 1 -C 40 linear, C 3 -C 40 branched-chain, aromatic or C 3 -C 40 carbocyclic alkyl radicals, C 6 -C 12 polyfunctional alcohols having from 2 to 10 hydroxyl groups, such as ethylene glycol, hexylene glycol, glycerol and 1,2,6-hexanetriol, alcohol ethers such as methoxyethanol and ethoxyethanol, or polyethylene glycols, L is a cation selected from the group consisting of Na + , K + , Mg 2+ , Ca 2+ , Zn 2+ , NH 4 + , alkylammonium, dialkylammonium, trialkylammonium, tetraalkylammonium and analogous phosphorus ammonium derivatives.