Preparation of concentrated polyacrylate dispersions

US4424298A · kind A · utility

Assignee

• BASF SE

Inventors

• Erich Penzel · Heidelberg, DE
• Guenter Eckert · Schifferstadt, DE
• Lothar Heider · Ludwigshafen, DE
• Lothar Wuertele · Ludwigshafen, DE
• Werner Schackert · Schifferstadt, DE

Key dates

• Filing date: Apr 28, 1982
• Grant date: Jan 3, 1984
• Expiry date: Apr 28, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Emulsion copolymerization of acrylic or methacrylic acid esters with from 0.3 to 10% by weight of .alpha.,.beta.-monoolefinically unsaturated monocarboxylic acids and/or dicarboxylic acids and/or their amides, with or without up to 25% by weight of styrene, acrylonitrile, vinyl acetate and/or vinyl chloride, using the emulsion feed process, gives particularly concentrated copolymer dispersions if an emulsifier system of 0.01-5.0% by weight of a sulfuric acid half-ester of an oxyalkylated alkylphenol and 0.01-1% by weight of a dialkyl sulfosuccinate, where alkyl is of 6 to 18 carbon atoms, is employed and the polymerization is carried out at pH 2-6.