Polyisocyanate-modified polycarboxylic acids and their use as crosslinking agents for epoxy resins

US5959060A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Schafer · Leichlingen, DE
• Knud Reuter · Krefeld, DE
• Hanns P. Muller · Leverkusen, DE
• Hans-Ulrich Meier-Westhues · Leverkusen, DE
• Ulrich Freudenberg · Hirschberg, DE
• Lothar Kahl · Bensberg, DE

Key dates

• Filing date: Apr 16, 1998
• Grant date: Sep 28, 1999
• Expiry date: Apr 16, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polyisocyanate-modified dicarboxylic acid derivatives obtainable by reacting organic polyisocyanates with excess quantities, based on the equivalent ratio of NCO/COOH groups, of dicarboxylic acid (poly)anhydrides containing free carboxyl groups and water. The present invention also relates to coating compositions, in particular powder coating compositions, containing these polyisocyanate-modified dicarboxylic acids as curing agents for resins containing epoxy groups.