| abstract |
Cationically hydrophilized polyurethaneurea characterized in that it is synthesized from a) at least one aliphatic, araliphatic and / or cycloaliphatic polyisocyanate, b) polyols having a number average molecular weight Mn> = 400 and <= 6,000 g / mol and a functionality of hydroxyl of> = 1.5 and <= 4, (i) comprising at least one polyester polyol b1), having an amorphous structure and consisting of aromatic dicarboxylic acids and / or the corresponding carboxylic anhydrides, as acid component, the fraction of aromatic dicarboxylic acids and / or their anhydrides in the polyester polyol being> = 35% by weight, based on the overall mass of the polyester polyol, and (ii) comprising at least one polyol b2), consisting of in aliphatic dicarboxylic acids and / or the corresponding carboxylic anhydrides, as an acid component, in which the weight ratio between the polyester polyol b1) and the polyester polyol b2) is between 2: 1 and 1: 3; c) at least one cationic hydrophilizing component having at least one group that is reactive towards isocyanate groups, and has at least one cationic or potentially cationic group, d) at least one aliphatic, amino-functional compound having at least two isocyanate-reactive amino groups, e) optionally, at least one alcohol having at least two hydroxyl groups and a molar mass of> = 60 and <= 399 g / mol and f) optionally, at least one compound having a group that is reactive towards isocyanate groups. |