Process for the preparation of polymers of vinylphosphonic acid in protic solvents

US4696987A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Walter Dursch · Königstein, DE
• Walter Herwig · Bad Soden, DE
• Friedrich Engelhardt · Frankfurt, DE

Key dates

• Filing date: Dec 27, 1983
• Grant date: Sep 29, 1987
• Expiry date: Dec 27, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F30/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the preparation of polymers of vinylphosphonic acid in protic diluents with the aid of catalysts which form free radicals, which comprises heating vinylphosphonic acid at temperatures of 40.degree. to 130.degree. C. in a total of 10 to 150% by weight of protic diluents for a total of 4-60 hours in the presence of 1.0 to 5.5% by weight of aliphatic peroxy-esters, diacyl peroxides and/or aliphatic azo compounds which decompose by half in one hour at temperatures below 122.degree. C.