Powder coating compositions, a process for their preparation, and their use for the coating of heat resistant substrates

US5508337A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wamprecht · Neuss, DE
• Reinhard Halpaap · Odenthal, DE
• Hans-Ulrich Meier-Westhues · Leverkusen, DE
• Wolfgang Schultz · Krefeld, DE

Key dates

• Filing date: May 5, 1994
• Grant date: Apr 16, 1996
• Expiry date: May 5, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a powder coating composition having a glass transition temperature of 20.degree. to 80.degree. C. and containing (A) 56 to 86.9% by weight of a polyacrylate polyol component having a hydroxyl number of 30 to 155 and a glass transition temperature of 30.degree. to 120.degree. C., (B) 0.1 to 9% by weight of a polyester polyol component having a hydroxyl number of 40 to 180 and a glass transition temperature of -40.degree. to 80.degree. C., (C) 13 to 35% by weight of a polyisocyanate component having a glass transition temperature of -40.degree. to 60.degree. C. and containing at least one ketoxime-blocked polyisocyanate selected from (i) polyisocyanate derivatives prepared from 1,6-diisocyanatohexane and containing biuret, isocyanurate, uretdione, and/or urethane groups, (ii) polyisocyanate derivatives prepared from mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane and containing isocyanurate groups and optionally uretdione groups and (iii) polyisocyanate derivatives prepared from 4,4'-diisocyanato-dicyclohexylmethane and containing urethane groups, and (D) at least one catalyst for the reaction between …