Process for the preparation of aromatic polyesters

US4260695A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harald Medem · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Klaus Reinking · Wermelskirchen, DE

Key dates

• Filing date: Nov 24, 1978
• Grant date: Apr 7, 1981
• Expiry date: Nov 24, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L67/03
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

High-molecular polyesters which are distinguished by good processability, a high glass transition temperature, mechanical strength and clear transparency are reproducibly obtained by transesterifying and polycondensing bisphenols with diaryl terephthalates and/or diaryl isophthalates in the presence of an aromatic polycarbonate having a molecular weight of 600 to 15,000.