Patent ID: 7820754

Claim:
An aqueous polymer dispersion, wherein the said polymer can be obtained from a mixture of monomers comprising, in parts by weight: a) 100 of at least one ethylenically unsaturated monomer not comprising an ionic group, b) 0.5 to 15 of at least one ethylenically unsaturated monomer carrying at least one carboxyl and/or carboxylic anhydride functional group, c) at least one ethylenically unsaturated monomer carrying at least one second functionality selected from: phosphate, phosphonate or phosphinate, in an amount such that the ratio c/(b+c) varies from 0.05 to 0.4, d) 0 to 2 of at least one ethylenically unsaturated monomer carrying at least one alkoxysilane functional group, e) 0 to 5 of at least one ethylenically unsaturated monomer carrying at least one active carbonyl functional group or another aldhehyde-reactive functional group, f) 0 to 10 of at least one ethylenically unsaturated monomer carrying at least one functional group selected from hydroxyl and primary or secondary amine or carrying a precursor group of such a functional group, and g) at least one alkoxylated alkyl phosphate anionic surfactant.