Process for the polymerization of vinyl halide polymers

US4391960A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Willi Kleine · Burghausen, DE
• Werner Frey · Thalwil, CH

Key dates

• Filing date: Jun 4, 1981
• Grant date: Jul 5, 1983
• Expiry date: Jun 4, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2/005
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An improvement in the process for the polymerization of vinyl halide polymers comprising polymerizing at least one vinyl halide and, optionally, other olefinically-unsaturated monomers copolymerizable with vinyl halides, in an aqueous dispersion in the presence of free-radical-forming polymerization initiators, dispersants and, optionally, other additives in the presence of an inhibitor of polymer deposits and recovering said vinyl halide polymers, the improvement consisting essentially of adding to the reaction mixture from 10 to 1,000 ppm, based on the monomers, of at least one carbonyl compound having the formula: ##STR1## wherein R.sup.1 is selected from the group consisting of hydrogen and a hydrocarbon having from 1 to 9 carbon atoms selected from the group consisting of alkyl, aryl, alkaryl and aralkyl; R.sup.2 represents an oxyhydrocarbon having from 1 to 9 carbon atoms selected from the group consisting of alkoxy, aryloxy, alkaryloxy and aralkoxy, and a hydrocarbon having from 1 to 9 carbon atoms selected from the group consisting of alkyl, aryl, alkaryl and aralkyl; X is selected from the group consisting of hydroxy and R.sup.3 --CO--, wherein R.sup.3 represents a hydroca…