Patent ID: 7345109

Claim:
Water-dilutable polyurethane dispersions comprising structural units derived from polyisocyanates A, polyols B having a number-average molar mass M n of at least 400 g/mol, compounds D that contain at least two groups reactive towards isocyanate groups and at least one group capable of anion formation, low molar mass polyols E that do not carry any further groups reactive towards isocyanate groups, compounds G that are monofunctional towards isocyanates or contain active hydrogen of different reactivity and that are different from the compounds E, characterised in that the polyols B contain a mass fraction of polycarbonate polyols B 1 of at least 85%, wherein the polycarbonate polvols B 1 are derived from mixtures of alkylene ether alcohols having from 2 to 4 carbon atoms in the alkylene group, and from 4 to 20 carbon atoms in total, and alpha,omega-dihydroxvalkanes.