Process for the production of aromatic polyesters

US4923957A · kind A · utility

Inventors

• Peter Tacke · Krefeld, DE
• Ulrich Grigo · New Martinsville, US
• Karsten-Josef Idel · Krefeld, DE

Key dates

• Filing date: Jan 3, 1989
• Grant date: May 8, 1990
• Expiry date: Jan 3, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/195
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aromatic polyesters based on diphenols and iso- and/or terephthalic acid are produced by transesterification of esters of the diphenols with the aromatic dicarboxylic acids in the melt by first reacting the aromatic dicarboxylic acids with a stoichiometric excess of the diphenol esters to form oligomers and then condensing the resulting oligomers to the aromatic polyesters with elimination and removal by distillation of diphenol ester.