Method for the production of colorless polyester amides

US4101524A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Klaus Burzin · Marl, DE
• Rainer Feldmann · Marl, DE

Key dates

• Filing date: Aug 24, 1976
• Grant date: Jul 18, 1978
• Expiry date: Aug 24, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/44
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The production of polyester amides based on dicarboxylic acids and/or the esters thereof, primary diamines, and polyhydric alcohols and/or aminocarboxylic acids or lactams, by poly-condensing the mixture under heating in the presence of water, while distilling off the volatile components, and recondensation under reduced pressure is improved so that colorless polyester amides are produced. In a first stage a monomer mixture is preliminarily condensed in the presence of about 3 - 20 percent of water, based on the sum total of the polyamide-forming components, under a pressure of about 14 - 25 bars, at temperatures of about 200.degree. - 300.degree. C and for a time period of about 4 - 12 hours. In a second stage, the mixture is completely condensed, after removal of the water, under a reduced pressure of about 0.01 - 100 mbar at temperatures of about 230.degree. - 300.degree. C and for a period of time of about 1 - 12 hours.