Process for production of polymers of vinyl chloride for paste preparation using spray-drying

US4133947A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Josef Kalka · Herten, DE
• Hermann Winter · Marl, DE
• Alfred Kania · Marl, DE

Key dates

• Filing date: Jul 7, 1976
• Grant date: Jan 9, 1979
• Expiry date: Jul 7, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F14/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An improved process for the aqueous emulsion polymerization of vinyl chloride to be spray-dried and thus form paste-yielding polymers wherein the polymerization is conducted in an emulsion containing at least 45% by weight of monomers together with an emulsifying amount of alkali metal fatty acid salts of 8-18 carbon atoms at a pH of 9.5-11.5, and wherein the pH is reduced to a value between 6 and 7.5 prior to spray-drying or to a value between 4 and 7.5 during the spray-drying step.