Process for isolating polymers from their solvents using liquids containing carbon dioxide

US5229486A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hanns-Ingolf Paul · Leverkusen, DE
• Rolf Treckmann · Cologne, DE
• Gunther Weymans · Leverkusen, DE
• Jurgen Kirsch · Cologne, DE
• Jürgen Heuser · Krefeld, DE
• Klaus Elgeti

Key dates

• Filing date: Dec 11, 1991
• Grant date: Jul 20, 1993
• Expiry date: Dec 11, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/403
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for isolating polymers from their solvents by addition of fluids containing carbon dioxide at temperatures of 30.degree. to 280.degree. C. and under pressures of 1 to 1,000 bar is disclosed. The process is characterized in that the concentration of the polymers in their solvents is between 5% and 80% by weight and the fluid containing carbon dioxide consists of at least 50% by weight carbon dioxide.