Coating containing acrylosilane polymer to improve mar and...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 133/00 (2006.01) C09D 143/04 (2006.01)

Patent

CA 2514925

The present invention relates to a coating composition particularly useful as a clear coating used over a pigmented base coat that has improved cure, which provides increased out of oven hardness, as well as improved mar and scratch resistance, and increased environmental chemical resistance. The composition is comprised of 40 - 70% by weight of film forming binder and 30 - 60% by weight of a volatile liquid carrier for the binder; wherein the binder contains a 25 - 98.5% by weight, based on the weight of the binder, of a silane polymer, 1 - 40% by weight, based on the weight of the binder, of an alkylated melamine crosslinking agent, 0.5 - 5% by weight, based upon the weight of the binder, of an aryl or alkyl acid phosphate curing agent, and 0 - 30% by weight, based upon the weight of the binder, of a non aqueous dispersed polymer, a urethane polymer, a polyester resin, an acrylic polyol resin, or any mixture thereof. The composition may be used, in particular, as a finish for automobiles and light trucks.

L'invention concerne une composition de revêtement particulièrement utile comme revêtement transparent utilisé sur une couche de fond pigmentée présentant un durcissement amélioré, conférant une dureté hors du four améliorée, une résistance améliorée aux dommages et griffures, ainsi qu'une résistance chimique environnementale améliorée. La composition renferme entre 40 et 70 % en poids d'un liant filmogène et entre 30 et 60 % en poids d'un support liquide volatil destiné au liant, celui-ci comprenant entre 25 et 98,5 % en poids, en fonction du poids du liant, d'un polymère silane, entre 1 et 40 % en poids, en fonction du poids du liant, d'un agent de réticulation de la mélamine alkylée, entre 0,5 et 5 % en poids, en fonction du poids du liant, d'un agent de durcissement d'acide aryl ou alkyl phosphate et entre 0 et 30 % en poids, en fonction du poids du liant, d'un polymère dispersé non aqueux, d'un polymère uréthanne, d'une résine polyester, d'une résine acrylique polyol ou d'un mélange quelconque de ces produits. La composition peut être utilisée, notamment, comme finition pour des véhicules automobiles ou des utilitaires légers.

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