Powder coating compositions and their use for coating heat resistant substrates

US5492955A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wamprecht · Neuss, DE
• Hans-Josef Laas · Odenthal, DE
• Manfred Bock · Leverkusen, DE
• Hans-Ulrich Meier-Westhues · Leverkusen, DE
• Wolfgang Schultz · Krefeld, DE
• Lothar Kahl · Bensberg, DE

Key dates

• Filing date: Oct 31, 1994
• Grant date: Feb 20, 1996
• Expiry date: Oct 31, 2014

Classification

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

Abstract

A powder coating composition which is curable at 120.degree. to 150.degree. C. and contains A) one or more copolymers prepared from olefinically unsaturated monomers and containing epoxy groups and optionally hydroxyl groups, B) one or more curing agents containing carboxylic acid or carboxylic acid anhydride groups, and C) one or more polyaddition compounds which contain uretdione groups, have a melting point or range of 40.degree. C. to 120.degree. C. and are prepared from (cyclo)aliphatic diisocyanates; and its use for coating of heat-resistant substrates, especially automotive substrates.