| 摘要 |
The present invention relates to a powder coating composition for the production of matt coatings containing as binder A) a component having hydroxyl groups, B) a polyisocyanate having blocked and optionally free isocyanate groups, C) a component having carboxyl groups and/or carboxylic anhydride groups and contains one or more of the following: C1) aliphatic and/or cycloaliphatic dicarboxylic acids having 4 to 20 carbon atoms, C2) monomeric and/or polymeric anhydrides of dicarboxylic acids C1) and C3) aliphatic hydroxycarboxylic acids having 4 to 18 carbon atoms, and 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 1) 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A), 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 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 invention further relates to heat resistant substrates coated with this powder coating composition.
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