Patent ID: 6841608

Claim:
An aqueous polymer dispersion comprising dispersed polymer particles of at least one addition polymer A1 obtained by free-radical emulsion polymerization in the presence of an addition polymer A2 synthesized from from 50 to 99.5% by weight of at least one ethylenically unsaturated mono- and/or dicarboxylic acid, from 0.5 to 50% by weight of at least one ethylenically unsaturated compound selected from the group consisting of esters of ethylenically unsaturated monocarboxylic acids, monoesters of ethylenically unsaturated dicarboxylic acids and diesters of ethylenically unsaturated dicarboxylic acids wherein each ester is obtained by esterifying with an amine having at least one hydroxyl group, and up to 20% by weight of at least one further monomer.