Polymerization of vinyl chloride in aqueous suspension

US3957744A · kind A · utility

Assignee

• Badische Anilin- & Soda-Fabrik Aktiengesellschaft

Inventors

• Walter Deuschel
• Erich Gulbins · Heidelberg, DE
• Alfred F. Hauss
• Dietrich Lausberg · Ludwigshafen, DE
• Wilhelm Sigmund

Key dates

• Filing date: Mar 15, 1973
• Grant date: May 18, 1976
• Expiry date: Mar 15, 1993

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/91
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymerization of vinyl chloride in aqueous suspension in the presence of free-radical initiators of short half-life at pH's below 8. The temperature of the reactor wall must not be more than 20.degree.C above the temperature of the polymerization mixture during the heat-up phase and it must be lower than the temperature of the polymerization mixture during the subsequent polymerization phase. This procedure suppresses the formation of incrustations in the reactor.