Preparation of polymers of acrylic acid or metharcylic acid

US4774303A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE
• Guenter Hirsch · Mutterstadt, DE
• Hans-Werner Becker · Ludwigshafen, DE
• Michael Rohmann

Key dates

• Filing date: Jan 29, 1987
• Grant date: Sep 27, 1988
• Expiry date: Jan 29, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/62
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Polymers of acrylic acid or methacrylic acid are prepared by polymerizing acrylic acid and/or methacrylic acid at 50.degree.-180.degree. C. in a C.sub.2 -C.sub.6 -alcohol or mixtures thereof with water having a C.sub.2 -C.dwnarw.6.uparw.-alcohol content of not less than 40% by weight in the presence of free radical polymerization initiators and from 0.01 to 5% by weight, based on the monomers used, of inorganic acids of phosphorus in which the phosphorus has an oxidation number of from 1 to 4, or of water-soluble salts thereof, water-soluble --PO(OH).sub.2 -containing compounds and/or water-soluble salts thereof. The polymers thus prepared are effective milling aids and dispersants for pigments for producing aqueous pigment slurries for use in paper-coating compositions.