Patent ID: 8334350

Claim:
An aqueous polymer dispersion, comprising: a dispersed addition polymer P comprising, copolymerized in free-radical polymerized form, at least one polar monomer having a water solubility of greater than 50 g/liter, measured at 20° C., wherein the dispersed addition polymer P is obtained by free-radical initiated aqueous emulsion polymerization of a reaction mixture comprising: (A) at least one monomer selected from the group consisting of an ethylenically unsaturated acid and a conjugated base of an ethylenically unsaturated acid; (B) at least one monomer of formula (I) wherein n is 0 to 2, R1, R2, and R3 are, independently of one another, hydrogen or a methyl group, X is O or NH, and Y is H, alkali metal, or NH 4 ; and (C) at least one monomer which comprises, in free-radically copolymerized form, at least two COOX groups, wherein X is H or a metal, wherein at least one selected from the group consisting of monomer (B) and monomer (C) is metered into the reaction mixture during polymerization at a variable rate, wherein the reaction mixture of the addition polymer P comprises no molecular weight regulator; and wherein the addition polymer P comprises no vinyl aromatic monomers.