Process for the production of colorless aromatic polyester and polyester carbonates

US4617368A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter Freitag · Krefeld, DE
• Ludwig Bottenbruch · Krefeld, DE
• Uwe Hucks · Alpen, DE

Key dates

• Filing date: Dec 10, 1984
• Grant date: Oct 14, 1986
• Expiry date: Dec 10, 2004

Classification

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

Abstract

The invention relates to a process for the production of colorless, heat-stable and hydrolysis-stable aromatic polyesters and polyester carbonates by conventional interfacial polycondensation of aromatic dicarboxylic acid dichlorides and diphenolates in which dicarboxylic acid dichlorides are used which have been obtained by chlorination from the dimethyl esters of the corresponding acids, and tertiary cycloaliphatic amines are used as catalysts.