Patent ID: 7393894
Filing Date: 2008-07-01
Classification: C08G,C09D

Abstract:
1. A self-crosslinking aqueous polyurethane dispersion containing a crosslinking agent I selected from diamines I1 and dihydrazides I2 and polyurethanes with structural units derived from polyisocyanates A, polyols B having a number-average molar mass M n of at least 400 g/mol, compounds D having at least two groups which are reactive towards isocyanates and at least one group which is capable of anion formation, low molar mass polyols E carrying no further groups which are reactive towards isocyanate groups, compounds F containing at least one group which is reactive towards isocyanate and at least one carbonyl group said compounds F being selected from the group consisting of 1-(4-hydroxyphenyl)-3-butanone, 2-acetyl-1-ethanol, 3-acetyl-1-propanol, 4-acetyl-1-butanol, and dihydro-5-hydroxymethyl-2(3H)-furanone, and compounds G which are monofunctional with respect to isocyanates or contain active hydrogen of differing reactivity and which differ from compounds E.