Powder coating composition providing low gloss

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/00 (2006.01) C09D 5/03 (2006.01) C09D 133/06 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2631104

The present invention provides a powder coating composition comprising A) 30 to 90 wt% of at least one glycidyl-functionalised (meth)acrylic resin, B) 30 to 90 wt% of at least one carboxyl functionalised polyurethane resin, C) 0.01 to 10 wt% of at least one wax, and D) 0.05 to 30 wt% of at least one coating additive, and optionally pigment and/or filler, the wt% based on the total weight of the powder coating composition; the powder coating composition provides coatings with a very low gloss level (highly matt finish) and smoothness, a superior durability against aggressive substances and a very good adhesion on metallic substrates.

La présente invention concerne une composition de revêtement en poudre comprenant (A) de 30 à 90 % en poids d~au moins une résine (méth)acrylique à fonction glycidylique, (B) de 30 à 90 % en poids d~au moins une résine de polyuréthane à fonction carboxylique, (C) de 0,01 à 10 % en poids d~au moins une cire, et (D) de 0,05 à 30 % en poids d~au moins un additif de revêtement, et en option un pigment et/ou agent de remplissage, le % en poids étant basé sur le poids total de la composition de revêtement en poudre ; la composition de revêtement en poudre confère aux revêtements un très faible niveau de brillance (fini très mat) et du lissé, une plus grande durabilité vis-à-vis des substances agressives et une très bonne adhésion sur des substrats métalliques.

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