Working up of polymer synthesis solutions

US6716933B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Alewelt · Krefeld, DE
• Wolfgang Ebert · Krefeld, DE
• Thomas Fritz · Gernsbach, DE
• Dirk Jahn · Twistringen, DE
• Stefan Westernacher · Kempen, DE
• Frank Bruynseels · Dendermonde, BE
• Johann Rechner · Krefeld, DE

Key dates

• Filing date: Jul 16, 2002
• Grant date: Apr 6, 2004
• Expiry date: Jul 16, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/40
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for working up solutions of polymers in organic solvents contaminated by alkaline constituents, using homogeneously soluble acids, especially by the introduction of an acid gas, and subsequent washing, and to the polymers so obtainable, which are distinguished by the fact that, on treatment with moist heat (sterilisation), only few defects caused by decomposition are formed, to the use thereof in the production of extrudates and molded specimen, and to the extrudates and molded specimen produced from those polymers themselves.