Stable powder coating compositions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/42 (2006.01) C08G 18/80 (2006.01) C09D 167/02 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2387987

The invention provides powder coatings that produce consistent finishes when cured, and are stable when uncured. These powder coatings of the invention include film forming systems. The film forming system, in turn, includes a polymer component and a crosslinker component. The crosslinker component includes a polyfunctional isocyanate compound which is at least partially blocked with at least one of the following: a polyhydroxy aromatic compound, or a mixture of a polyhydroxy aromatic compound and a hydroxy-functional ester compound. The polymer component which can be used when practicing certain embodiments of this invention includes a polyester polyol. This polyester polyol includes the reaction product of a cycloaliphatic component and a polyfunctional isocyanurate component.

L'invention concerne des revêtements pulvérulents produisant des finitions durables quand ils sont durcis et présentant une stabilité quand ils ne sont pas durcis. Ces revêtements pulvérulents comprennent des systèmes de formation de couches minces. Ce système, à son tour, comporte un constituant polymère et un constituant de réticulation. Ce dernier contient un composé d'isocyanate polyfonctionnel au moins partiellement bloqué par au moins un des composés suivants: un composé aromatique polyhydroxy, ou un mélange d'un composé aromatique polyhydroxy et d'un composé d'ester présentant une fonctionnalité hydroxy. Le constituant polymère qu'on peut utiliser dans certains modes de réalisation de l'invention, contient un polyol de polyester. Ce polyol de polyester comprend le produit réactionnel d'un constituant cycloaliphatique et d'un constituant d'isocyanurate polyfonctionnel.

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