Stabilized aliphatic polycarbonates

US5064885A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Friedemann Muller · Neuss, DE
• Edgar Leitz · Dormagen, DE
• Herbert Eichenauer · Dormagen, DE
• Karl-Heinz Ott
• Hans-Josef Buysch · Krefeld, DE

Key dates

• Filing date: Feb 11, 1991
• Grant date: Nov 12, 1991
• Expiry date: Feb 11, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/527
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to aliphatic polycarbonates including sequential copolymers based on cyclic aliphatic carbonates and esters and block copolymers of blocks of polymerised cyclic aliphatic carbonates and blocks of polymerised vinyl compounds stabilized against thermal degradation containing 0.01 to 3.0% by weight, based on polymer, of a compound of trivalent phosphorus.