Coating composition having improved adhesion to substrate

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 201/06 (2006.01) C08G 18/71 (2006.01) C08K 5/54 (2006.01) C09D 5/08 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2222228

The invention pertains to a coating composition comprising a polyacetoacetate and a crosslinker for said polyacetoacetate wherein the crosslinker is present in an amount insufficient to crosslink all acetoacetate groups and the polyacetoacetate has a number average molecular weight less than 1000. The coating composition may also comprise an organosilane. The organosilane preferably comprises at least one amino group, amino-containing group, epoxy group, epoxy-containing group, mercapto group, mercapto-containing group, vinyl group, vinyl-containing group, isocyanate group, isocyanate-containing group, ureido group, ureido-containing group, imidazole group or imidazole-containing group. The coating composition is particularly useful as a primer for an aluminium substrate.

L'invention a trait à une composition pour revêtement comportant un polyacétoacétate et un agent de réticulation de celui-ci. Cet agent de réticulation ne se présente pas en volume suffisant pour réticuler tous les groupes acétoacétate et le polyacétoacétate a un poids moléculaire moyen en nombre inférieur à 1000. Cette composition de revêtement peut également comporter un organosilane comprenant, de préférence, au moins un groupe amino, un groupe contenant un amino, un groupe époxy, un groupe contenant une époxy, un groupe mercapto, un groupe contenant un mercapto, un groupe vinyle, un groupe contenant un vinyle, un groupe isocyanate, un groupe contenant un isocyanate, un groupe uréido, un groupe contenant un uréido, un groupe imidazole ou un groupe contenant un imidazole. Cette composition de revêtement se révèle des plus utile comme apprêt pour un substrat d'aluminium.

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