Preparation of copolymers of monoethylenically unsaturated monocarboxylic acids and dicarboxylic acids

US5175361A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE
• Wolfgang Trieselt · Ludwigshafen, DE
• Albert Hettche · Heßheim, DE
• Rolf Schneider · Burgstetten, DE
• Hans-Juergen Raubenheimer · Ketsch, DE

Key dates

• Filing date: Nov 30, 1990
• Grant date: Dec 29, 1992
• Expiry date: Nov 30, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of copolymers which contain monoethylenically unsaturated monocarboxylic acids and dicarboxylic acids as copolymerized monomer units, which comprises copolymerizing PA1 a) 10 to 60% by weight, based on the sum of the monomers, of a monoethylenically unsaturated dicarboxylic acid of 4 to 6 carbon atoms, -or an alkali metal salt thereof or, an anhydride thereof, PA1 b) 90 to 40% by weight of a monoethylenically unsaturated monocarboxylic acid of 3 to 10 carbon atoms or an alkali metal salt thereof and PA1 c) 0 to 20% by weight of another monoethylenically unsaturated monomer, not having carboxyl groups and which is copolymerizable with a) and b); in an aqueous medium in the presence of from 0.5 to 5% by weight, based on monomers, of a water-soluble initiator.