Process for the continuous manufacture of vinyl chloride polymers

US4286078A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Franz Botsch · Altötting, DE
• Helmut Kraus · Cologne, DE

Key dates

• Filing date: Jul 30, 1979
• Grant date: Aug 25, 1981
• Expiry date: Jul 30, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/911
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the continuous preparation of vinyl chloride polymers containing at least 85 weight percent of polymerized vinyl chloride units in an aqueous emulsion in the presence of at least one water soluble catalyst and 1.5 to 3.5 weight percent (calculated on the monomer(s)) of at least one water soluble salt of an aliphatic, saturated monocarboxylic acid having the formula ##STR1## wherein R.sub.1 and R.sub.2 are equal or different each representing a saturated, branched or unbranched alkyl radical having 1 to 5 carbon atoms or of at least one of said water soluble salt in mixture together with at least one known emulsifier being an organic compound containing sulfonic acid-groups. The resulting polymers show an equally excellent thermostability in mixture with one of a multiplicity of known stabilizers especially of the lead-, tin- or barium/cadmium type.