High molecular weight aromatic polyesters and processes for their production

US4482694A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter Freitag · Krefeld, DE
• Uwe Hucks · Alpen, DE
• Hans-Jurgen Meissner · Lüneburg, DE

Key dates

• Filing date: Apr 25, 1983
• Grant date: Nov 13, 1984
• Expiry date: Apr 25, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/79
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

High molecular weight aromatic polyesters having a low content of end groups and a very slight inherent color can be obtained according to the phase interfacial process wherein particular amines and a slight alkali excess are used.