The use of an aqueous polymer dispersion comprising dispersed particles of at
least one polymer A1 obtainable by free-radical emulsion polymerization in the
presence of a polymer A2 synthesized from
from 50 to 99.5% by weight of at least one ethylenically unsaturated
monocarboxylic and/or dicarboxylic acid,
from 0.5 to 50% by weight of at least one ethylenically unsaturated
compound selected from the esters of ethylenically unsaturated monocarboxylic acids
and the monoesters and diesters of ethylenically unsaturated dicarboxylic acids
with an amine containing at least one hydroxyl group,
up to 20% by weight of at least one further monomer
