Clearcoat paint composition

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 135/02 (2006.01) C08J 3/24 (2006.01) C08J 7/04 (2006.01) C08K 5/3492 (2006.01) C09D 5/02 (2006.01) C09D 5/24 (2006.01) C09D 133/10 (2006.01)

Patent

CA 2575823

A coating composition including an aqueous dispersion of a copolymerization product of a mixture of monomers including carbamate-functional and (meth)acrylic monomers, some having carboxylic acid-functionality. The monomer mixture is essentially free of hydroxyl monomer. The coating can be applied on a polycarbonate substrate. The coating composition may be a clearcoat coating composition, preferably an automotive clearcoat coating composition. The invention provides a method of producing such a coating and application on a substrate, particularly as a basecoat/clearcoat composite coating, with the coating composition of the invention preferably being at least the clearcoat of the composite coating. If the substrate is a polycarbonate, the clearcoat can be applied directly on the substrate without any primer or basecoat.

L'invention concerne une composition de revêtement comportant une dispersion aqueuse d'un produit de copolymérisation d'un mélange de monomères renfermant des monomères carbamate-fonctionnels et (méth)acryliques, certains ayant une fonctionnalité acide carboxylique. Le mélange monomère est essentiellement exempt de monomère hydroxyle. Le revêtement peut être appliqué sur un substrat polycarbonate. La composition de revêtement peut être une composition de revêtement transparent, de préférence de revêtement transparent pour automobile. L'invention concerne un procédé de production d'un tel revêtement et d'application sur un substrat, en particulier comme revêtement composite de couche de fond/d'enduit lustré, ladite composition de revêtement selon l'invention étant de préférence au moins l'enduit lustré du revêtement composite. Si le substrat est un polycarbonate, on peut appliquer l'enduit lustré directement sur le substrat sans couche d'apprêt, ni couche de fond.

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