Polyurethane powder coatings

Details Polyurethane powder coatings Polyurethane powder coatings

C - Chemistry, Metallurgy

09

D

C09D 175/06 (2006.01) C08G 18/42 (2006.01) C08G 18/46 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C09D 5/03 (2006.01) C09D 167/02 (2006.01)

Patent

CA 2197007

This invention relates to thermosetting powder coatings formulated with a polyisocyanate and a blend of a hydroxylated polyester resin having a low hydroxyl number and a hydroxylated resin based on tris(hydroxyethyl)isocyanurate having a high hydroxyl number. Powder coatings from this blend exhibit high hardness and good caking stability.

L'invention concerne des poudres de revêtement thermodurcissables, dont la formule comprend un polyisocyanate et un mélange de résine de polyester hydroxylée, dont le nombre hydroxyle est bas, ainsi qu'une résine hydroxylée à base de tris(hydroxyéthyle)isocyanurate, dont le nombre hydroxyle est élevé. Les poudres de revêtements obtenues au moyen de ce mélange présentent des caractéristiques optimisées de dureté et de stabilité de prise en masse.

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