Process for the production of polycondensate containing cyclic imide groups

US4187365A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: May 15, 1978
• Grant date: Feb 5, 1980
• Expiry date: May 15, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/1035
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polycondensates linked by cyclic imide groups, wherein at least one organic polyisocyanate or masked isocyanate, formic acid and at least one cyclic dicarboxylic acid anhydride compound which, in addition to the cyclic anhydride group, is substituted at least once by another cyclic anhydride, carboxyl, carbalkoxy, carbaroxy or SO.sub.3 H group, are polycondensed at temperatures in the range from 0.degree. to 450.degree. C.