Process for the purification of polycarbonate and polyester carbonate solutions

US5420241A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Fennhoff · Willich, DE
• Pieter Ooms · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Ralf Pakull · Krefeld, DE

Key dates

• Filing date: Apr 7, 1994
• Grant date: May 30, 1995
• Expiry date: Apr 7, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/406
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for purifying aromatic carbonate polymers, including polycarbonates and polyestercarbonates, is disclosed. Accordingly a carbonate polymer in an organic solvent is rendered virtually free of low molecular weight components by agitation with aluminosilicate or by passing through layers of such aluminosilicate. The aluminosilicate is subsequently separated off and the carbonate polymer is isolated in known methods.