Powder coating composition and its use for the preparation of matte coatings

US5786419A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Ulrich Meier-Westhues · Leverkusen, DE
• Wolfgang Schultz · Krefeld, DE
• Hans-Josef Laas · Odenthal, DE
• Walter Schafer · Leichlingen, DE
• Hans-Peter Klee · Burscheid, DE

Key dates

• Filing date: May 16, 1996
• Grant date: Jul 28, 1998
• Expiry date: May 16, 2016

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 matte coatings, containing PA1 A) a hydroxyl group-containing component, PA1 B) an addition polymerization compound which is based on aliphatic and/or cycloaliphatic diisocyanates and contains uretdione groups, PA1 C) a component which contains carboxyl and/or carboxylic acid anhydride groups and is selected from PA2 C1) aliphatic and/or cycloaliphatic dicarboxylic acids containing 4 to 20 carbon atoms, PA2 C2) monomeric and/or polymeric anhydrides of the acids C1) which may optionally be modified and PA2 C3) aliphatic hydroxycarboxylic acids containing 4 to 18 carbon atoms, and PA1 D) a component which contains groups which are reactive with carboxyl and/or carboxylic acid anhydride groups, provided that components A), B), C) and D) are present in amounts such that 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A), 0.3 to 1.5 groups of component D) which are reactive with carboxyl and/or carboxylic acid anhydride groups are present for each carboxyl equivalent of component C) and the amount of components C) and D) is 10 to 40% by weight of the total am…