Method of preparing polycarbonates and polyester carbonates

US5357028A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ralf Pakull · Krefeld, DE
• Gerhard Fennhoff · Willich, DE
• Werner Struver · Leverkusen, DE
• Jurgen Kirsch · Cologne, DE

Key dates

• Filing date: Sep 28, 1993
• Grant date: Oct 18, 1994
• Expiry date: Sep 28, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A catalytic method for preparing thermoplastic carbonate polymers is disclosed. In the method according to the interfacial polycondensation process or the homogeneous solution process, resins which containing catalytically active groups are used as catalysts. The resulting resins are characterized by their color stability and temperature stability.