Process for the purification of polycarbonate and polyester carbonate solutions

USRE36432E · kind E · reissue

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: May 15, 1997
• Grant date: Dec 7, 1999
• Expiry date: May 15, 2017

Classification

• Technology area (CPC —): General

Abstract

A process for purifying aromatic carbonate polymers, including polycarbonates and polyestercarbonates, is disclosed. Accordingly, a carbonate polymer is 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.