Matt polyurethane powder coatings and their use for coating heat resistant substrates

US5811190A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Laas · Odenthal, DE
• Hans-Ulrich Meier-Westhues · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE
• Ulrich Freudenberg · Hirschberg, DE
• Hans-Peter Klee · Burscheid, DE

Key dates

• Filing date: Jan 31, 1997
• Grant date: Sep 22, 1998
• Expiry date: Jan 31, 2017

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 for the production of matt coatings containing as binder PA0 A) a component having hydroxyl groups, PA0 B) a polyisocyanate having blocked and optionally free isocyanate groups, PA0 C) a component having carboxyl groups and/or carboxylic anhydride groups and contains one or more of the following: PA1 C1) aliphatic and/or cycloaliphatic dicarboxylic acids having 4 to 20 carbon atoms, PA1 C2) monomeric and/or polymeric anhydrides of dicarboxylic acids C1) and PA1 C3) aliphatic hydroxycarboxylic acids having 4 to 18 carbon atoms, and PA0 D) a component which has groups that are reactive with carboxyl groups and/or carboxylic anhydride groups wherein components A), B), C) and D) are present in amounts such that PA1 1) 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A), PA1 2) 0.3 to 1.5 groups of component D) that are reactive with carboxyl groups and/or carboxylic anhydride groups are present for each carboxyl equivalent of component C) and PA1 3) components C) and D) are present in an amount of 10 to 40 wt. %, based on the total weight of components A), B), C) and D). The inven…