Process for preparing an aqueous composition of a synthetic organic po-limero for use, for example like special Sador in latex paint.

摘要

Novel aqueous liquid emulsion polymers are prepared by the copolymerization of (A) 15-60 weight percent of a C3-C8 alpha , beta -ethylenically unsaturated carboxylic acid monomer, preferably acrylic or methacrylic acid or a mixture thereof with itaconic or fumaric acid, (B) 15-80 weight percent of a nonionic copolymerizable C2-C12 alpha , beta -ethylenically unsaturated monomer, preferably a monovinyl ester such as ethyl acrylate or a mixture thereof with styrene, acrylonitrile, vinyl chloride or vinyl acetate, and (C) 1-30 weight percent of certain nonionic vinyl surfactant esters, such as nonylphenoxypoly (ethyleneoxy)9 ethyl acrylate, to give an emulsion copolymer stable as an aqueous colloidal dispersion at an acid pH lower than about 5.0 but responsive to pH adjustment with base. These emulsion polymers adjusted to a pH of 5.5-10.5 or higher are effective thickeners for a wide variety of aqueous systems including cosmetic products, drilling muds, and particularly aqueous coating compositions such as latex paint.