Process for the production of polyamide imides

US4472567A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilfried Zecher · Leverkusen, DE
• Rudolf Merten · Leverkusen, DE
• Willi Dunwald · Leverkusen, DE

Key dates

• Filing date: Aug 22, 1983
• Grant date: Sep 18, 1984
• Expiry date: Aug 22, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/343
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The condensation of organic polyisocyanates, lactams, and cyclic polycarboxylic acid anhydrides in the presence of mono- or disubstituted imidazole catalyst results in a polyamide imide having an increased softening temperature.