Powder coating compositions

Details Powder coating compositions Powder coating compositions

C - Chemistry, Metallurgy

09

D

C09D 5/03 (2006.01) C09D 133/06 (2006.01) C09D 133/14 (2006.01) C09D 167/02 (2006.01)

Patent

CA 2504696

The present invention relates to powdered thermosetting coating compositions comprising a co-reactable mixture of a glycidyl group containing acrylic copolymer, a carboxylic acid group containing acrylic copolymer, a carboxylic acid group containing polyester, all 3 compounds having a high Tg, along with a low Tg counterpart of 1 to 3 of these compounds, and a thermosetting catalyst. These thermosetting powder coatings particularly are designed for coating heat-sensitive substrates and produce a finish which exhibits reduced gloss.

La présente invention concerne des compositions de revêtement thermodurcissables en poudre contenant un mélange coréactif d'un copolymère acrylique contenant un groupe glycidyle, d'un copolymère acrylique contenant un groupe acide carboxylique, d'un polyester contenant un groupe acide carboxylique, les trois composés ayant une Tg élevée, avec une contrepartie à Tg basse d'1 à 3 de ces composés, et un catalyseur de thermodurcissement. Ces revêtements en poudre thermodurcissables sont conçus en particulier pour le revêtement de substrats thermosensibles et il produisent une finition présentant une brillance réduite.

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