Process for the preparation of aromatic polyesters

US4966958A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Tacke · Krefeld, DE
• Ludwig Bottenbruch · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Ulrich Grigo · New Martinsville, US
• Wolfgang Alewelt · Krefeld, DE

Key dates

• Filing date: Jul 3, 1989
• Grant date: Oct 30, 1990
• Expiry date: Jul 3, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/19
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aromatic polyesters are prepared by the transesterification of aromatic dicarboxylic acid dialkyl esters with diester derivatives of divalent phenols at temperatures of about 260.degree. to 350.degree. C. with removal of the resulting monocarboxylic acid alkyl ester from the reaction mixture.