Process for the preparation of carbonic acid bis-diphenol esters of polyester-diols and their use for the preparation of high-molecular segmented polyester/polycarbonates which can be processed as thermoplastics

US4216298A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Schreckenberg · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Christian Lindner · Bensheim, DE
• Carlhans Suling · Odenthal, DE
• Herbert Bartl · Odenthal, DE
• Klaus Konig · Leverkusen, DE

Key dates

• Filing date: May 24, 1978
• Grant date: Aug 5, 1980
• Expiry date: May 24, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/64
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to the transesterification of the carbonic acid aryl esters prepared according to German Published Patent Specification 2,651,639 (which corresponds to U.S. Patent application Ser. No. 854,174, filed Oct. 25, 1977) with an excess of diphenol for the preparation of polyester-diol bis-diphenol carbonate. The present invention further relates to the polyester-diol bis-diphenol carbonates obtained according to the invention and their use for the preparation of polyester/polycarbonates and to the polyester/polycarbonates so prepared.