Patent ID: 7115686

Claim:
A water-dilutable polyester resin ABCD derived from hydroxy-functional compounds A containing on average at least two hydroxyl groups per molecule, from acids B containing on average at least two acid groups per molecule, from unsaturated compounds C containing at least one group which is reactive under condensation conditions with hydroxy-functional or acid functional compounds, the said group being selected from the group consisting of hydroxyl groups, amino groups, carboxylic acid groups, sulfonic acid groups, and phosphonic acid groups, and from compounds D having at least one sulfonic acid group per molecule, and additionally at least one group selected from the group consisting of hydroxyl groups, carboxyl groups, and amino groups, having a mass fraction of from 1 to 10% of units derived from unsaturated cocondensed building blocks, an olefinic double bond content of from 10 to 2 000 mmol/kg, and a sulfonic acid group content of from 30 mmol/kg to 200 mmol/kg.