Patent ID: 7557156

Claim:
Hydroxy-functional polyester dispersions containing urethane groups and comprising the following synthesis components: a) 87.0% to 95% by weight of at least one hydroxyl-functional polyester having an average functionality>2, b) 1% to 2.4% by weight of at least one di- and/or tri- and/or mono hydroxycarboxylic acid and/or aminocarboxylic acid, c) 4% to 10.6% by weight of one or more at least difunctional polyisocyanates and d) 0 to 3% by weight of other components, the percentages a) to d) adding up to 100%, and at least 50% of the acid groups incorporated via component b) are in the form of salt groups, wherein the acid number of the polyester dispersions incorporated via component b) is 5.0 to 9.9mg KOH/g substance, and wherein the urethane group content of the of the polyester dispersions is from 3.0% by weight to 6.4% by weight.