Process for the production of polycondensates containing imide groups

US4088637A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Sep 22, 1976
• Grant date: May 9, 1978
• Expiry date: Sep 22, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polyimides by the condensation of cyclic polycarboxylic acid anhydrides with polyisocyanates and isocyanurates substituted with masked isocyanate groups in the presence of lactams or polyols, and the production of coatings on metals, in particular of lacquers on wires, and of films thereof.