Process for the manufacture of vinyl chloride polymer dispersions with a low monomer content

US4158092A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Franz Botsch · Altötting, DE
• Christoph Heinze · Burghausen, DE
• Horst Wolff · Geretsried, DE

Key dates

• Filing date: Oct 26, 1977
• Grant date: Jun 12, 1979
• Expiry date: Oct 26, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31855
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Polymer dispersions are subject to a spray treatment to reduce the monomer content thereof. The dispersions are sprayed against the wall of the vessel by means of at least one spray nozzle. The residual monomer content of polymer dispersions is further reduced by spraying them in at least two series connected vessels, conducting the escaping gaseous constituents in one direction and the dispersion in opposite direction from one vessel to the next. The process is little liable to troubles and ensures a very effective monomer removal without thermal damage of the polymer.