| abstract |
The present invention relates to hydrophilic polyurethane (PU) prepolymers comprising a polymer backbone with structural units of formula (I), (see formula I) in which R1 and R2 independently of one another the radicals H, C1-C20-(cyclo)alkyl, C6-C24-aryl, C1-C20-(cyclo)alkyl ester or amide, C6-C24-aryl ester or amide, mixed aliphatic/aromatic radicals having 1 to 24 carbon atoms, which may also be part of a 4 to 8-membered ring, and X is an electron-withdrawing group, n is an integer from 0 to 5, and also having structural units of polymeric polyols from the average molar weight range from 400 to 600, the polymer backbone possessing ionic or potentially ionic and/or nonionically hydrophilicizing groups. |