Process and device for continuously treating with gases aqueous dispersions of polyvinyl chloride

US4301275A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

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

Key dates

• Filing date: May 19, 1980
• Grant date: Nov 17, 1981
• Expiry date: May 19, 2000

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/182
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In aqueous dispersions on the basis of polyvinyl chloride the content of residual monomers is reduced by the countercurrent method by contacting the rapidly moved surface of the dispersion with secluded intensely mixed gas atmospheres in several successive chambers. To carry out the process a device is used which permits to obtain under mild conditions residual monomer contents of 10 ppm and therebelow.