Production of binders for coating compositions

Claim 1

A process for the production of a binder for coating agents wherein the binder is prepared by the polymerization, in the aqueous phase in the presence of an anionic emulsifier, polyethylene oxide and peroxydisulfate and at an elevated temperature, of a monomer mixture consisting by weight of 10-85% of vinyl aromatic component, which may be partially replaced by 0-20% of acrylonitrile, and 15-90% of a diolefin component, 0-6% of α,β-unsaturated carboxylic acid, and 0.-6% of an amide of an α,β-unsaturated carboxylic acid, which comprises employing a reaction mixture which contains at the beginning of the polymerization, by weight, based on the monomer mixture, about 0.05 - 0.5% of an anionic sulfonate or sulfate emulsifier; about 0.5 - 5% of a polyethylene oxide having an average molecular weight of between about 300 and 4,000; and about 0.5 - 2% of a water-soluble peroxydisulfate; and, after a monomer conversion of between about 15 and 35% by weight, adding to the reaction mixture another 0.2 - 1.5% by weight of starting monomer mixture of an anionic sulfonate or sulfate emulsifier.