Patent ID: 8030391

Claim:
An aqueous plastic dispersion based on a vinyl ester copolymer having a solids content of up to 80% by weight and a minimum film formation temperature below 20° C., the vinyl ester copolymer being characterized by the following features: it is a multistage polymer and is derived from at least one homo- or copolymer A and at least one homo- or copolymer B, the copolymer A is derived from a monomer composition A which would give a copolymer having a glass transition temperature in the range from 0 to 20° C., the homo- or copolymer B is derived from a monomer composition B which would give a homo- or copolymer having a glass transition temperature in the range from 20 to 50° C., monomer compositions A and B which give polymers A and B whose glass transition temperatures differ by at least 10 K are used, the sum of the proportions of the polymers A and B in the vinyl ester copolymer are at least 50% by weight, based on the vinyl ester copolymer, the weight ratio of monomer composition A to monomer composition B is in the range from 95/5 to 5/95, the monomer composition A contains from 50 to 100% by weight of at least one vinyl ester of carboxylic acids having 1 to 18 carbon atoms (M1), based on the total mass of the monomers used in monomer composition A, the monomer composition B contains from 50 to 100% by weight of at least one vinyl ester of carboxylic acids having 1 to 18 carbon atoms (M1), based on the total mass of the monomers used in monomer composition B, at least one of the monomer compositions A or B contains from 0.05 to 10% by weight of at least one unsaturated, copolymerizable organosilicon compound (M4), based on the total mass of the monomers used in this monomer composition, the vinyl ester copolymer contains, based on the total mass of the monomers used for the preparation of the vinyl ester copolymer, from 0 to 3% by weight of structural units derived from at least one ethylenically unsaturated, ionic monomer (M3), the vinyl ester copolymer contains, based on the total mass of the monomers used for the preparation of the vinyl ester copolymer, from 0 to 10% by weight of structural units derived from at least one ethylenically unsaturated, nonionic monomer (M5), the aqueous plastic dispersion contains from 0 to 3% by weight, based on the total mass of the monomers used for the preparation of the vinyl ester copolymer, of ionic emulsifiers (S1), the aqueous plastic dispersion contains at least 0.5% by weight, based on the total mass of the monomers used for the preparation of the vinyl ester copolymer, of nonionic emulsifiers (S2), and wherein the ratio of the total mass of ionic components (M3) and (S1) to the total mass of nonionic components (M5) and (S2) used assumes a value of from 0.0 to 0.9.