| 摘要 |
Disclosed is a powder coating composition for forming a coating layer having a matt appearance. The powder coating composition comprises: A) a crosslinker component, and B) a polyester component having -COOH and/or OH groups and being a mixture of: B1) 10-80% by weight of an amorphous polyester, and B2) 90-20% by weight of a specific (semi)crystalline polyester, where the (semi)crystalline polyester is formed of a dicarboxylic acid component and a polyol component, in which the dicarboxylic acid is composed of 50-100 mol% of succinic, adipic, sebacic or dodecanedioic acid and 50-0 mol% of another dicarboxylic acid and the polyol component is composed of 50-100 mol% of ethylene glycol, butane-1,4-diol or hexane-1,6- diol and 50-0 mol% of another polyol. The crosslinker A) has reactive epoxy or hydroxyalkylamide groups when the polyester component B) has -COOH groups and the crosslinker A) has optionally blocked isocyanate groups when the polyester component B) has -OH groups.
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