Patent ID: 7872067

Claim:
An amphiphilic polymer composition, obtainable by reacting a) at least one hydrophobic polymer P1 which carries functional groups R P1 which are reactive toward isocyanate groups and which is constructed of ethylenically unsaturated monomers M1, comprising: a1) at least 10% by weight, based on the total amount of monomers M1, of monomers M1a of the formula I in which X is oxygen or a group N—R 4 ; R 1 is C 1 -C 10 -alkyl, C 5 -C 10 -cycloalkyl, phenyl or phenyl-C 1 -C 4 -alkyl; R 2 is hydrogen or C 1 -C 4 -alkyl; R 3 is hydrogen or C 1 -C 4 -alkyl; and R 4 is hydrogen or C 1 -C 4 -alkyl; a2) up to 90% by weight, based on the total amount of monomers M1, of neutral monoethylenically unsaturated monomers M1b whose solubility in water at 25° C. is less than 50 g/l and which are different from the monomers M1a, wherein the total amount of M1a and M1b is at least 80% by weight based on the total amount of monomers M1, and a3) not more than 20% by weight, based on the total amount of monomers M1, of ethylenically unsaturated monomers M1c which are different from the monomers M1a and M1b, b) at least one hydrophilic polymer P2 which carries functional groups R P2 which are reactive toward isocyanate groups, wherein the polymer P2 is an aliphatic polyether, at least 50% by weight of which is constructed from ethylene oxide groups, and has no ionic groups, c) with at least one compound V which contains isocyanate groups and, with respect to the isocyanate groups, has a functionality of at least 1.5, where the proportion of the hydrophobic polymer P1 in the amphiphilic polymer composition is from 20 to 68% by weight, the proportion of the hydrophilic polymer P2 in the amphiphilic polymer composition is from 30 to 78% by weight and the proportion of the compound V in the amphiphilic polymer composition is from 2 to 20% by weight, in each case based on the total weight of polymer P1, polymer P2 and compound V.