Guanidine-derived catalyts for preparing polycarbonates by transesterification

US5418316A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Steffen Kuhling · Meerbusch, DE
• Hermann Kauth · Krefeld, DE
• Wolfgang Alewelt · Krefeld, DE

Key dates

• Filing date: Jun 9, 1994
• Grant date: May 23, 1995
• Expiry date: Jun 9, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/307
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a transesterification process for the production of thermoplastic, solvent-free polycarbonates by the use of catalysts that are derived from guanidine.