Patent ID: 7078455

Claim:
An aqueous plastic material dispersion based on a vinyl ester copolymer P obtained by multistage emulsion polymerization with a solid content of up to 80% by weight and a minimum film formation temperature below 20° C., which is substantially stabilized by ionic components, the vinyl ester copolymer P comprising at least one homo- or copolymer A and at least one homo- or copolymer B, and the homo- or copolymer A having a glass transition temperature of 0 to 20° C. and the homo- or copolymer B having a glass transition temperature of 20 to 50° C., provided that the glass transition temperatures of the two homo- or copolymers A and B differ by at least 10 K, the sum of the amounts of the homo- or copolymers A and B in the vinyl ester copolymer P being at least 50% by weight, based on the copolymer P, the weight ratio of homo- or copolymer A to homo- or copolymer B being 95/5 to 5/95 and the homo- or copolymers A and B, independently of one another, containing in the form of copolymerized units a) from 50 to 100% by weight of at least one vinyl ester of carboxylic acids of 1 to 18 carbon atoms (M1) and b) from 0 to 25% by weight of at least one monoethylenically unsaturated, optionally halogen-substituted hydrocarbon of 2 to 4 carbon atoms (M2), based on the total mass of the monomers used for the preparation of the respective homo- or copolymer A and B, wherein it comprises, based on the total mass of the monomers used for the preparation of the vinyl ester copolymer P, from 0 to 10% by weight of at least one ethylenically unsaturated, ionic monomer (M3) and from 0 to 5% by weight of ionic emulsifiers (S1), the total mass of ethylenically unsaturated, ionic monomers (M3) and ionic emulsifiers (S1) being at least 2%.by weight.