Process for coating thermoplastic substrates with a coating...

C - Chemistry – Metallurgy – 08 – J

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C08J 7/04 (2006.01) C08G 18/28 (2006.01) C08G 18/42 (2006.01) C08G 18/50 (2006.01) C08G 18/77 (2006.01) C08J 3/09 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2382068

A process for coating a thermoplastic substrate which comprises applying a solvent based coating composition to the substrate and curing the coating composition at ambient temperature to 125~C to form a uniform smooth film on the substrate; wherein the coating composition contains about 45-80% by weight of a film forming binder and 20-55% by weight of an organic liquid carrier; wherein the binder contains (A) 40-90% by weight, based on the weight of the binder, of a polymer selected from the following: acrylic polyol, polyester polyol, polyether polyol or a polyurethane polyol; and (B) 10-60% by weight, based on the weight of the binder, of an organic polyisocyanate crosslinking agent; and wherein the organic liquid carrier used in the coating composition comprises at least 50% by weight, based on the weight of the organic liquid carrier used in the coating composition, of tertiary butyl acetate; the process of this invention also can be used to apply lacquers, i.e., coating composition that do not contain a crosslinking agent such as a polyisocyanate.

Procédé servant à revêtir un substrat thermoplastique et consistant à appliquer à ce substrat une composition de revêtement à base de solvant et à durcir cette composition de revêtement à température ambiante jusqu'à 125 ·C afin d'obtenir un film lisse uniforme sur le substrat. Cette composition de revêtement contient 45-80 % en poids d'un liant formant un film et 20-55 % en poids d'un véhicule liquide organique. Ce liant contient: (A) 40-90 % en poids, sur la base du poids du liant, d'un polymère sélectionné dans polyol acrylique, polyol de polyester, polyol de polyéther ou polyol de polyuréthane; (B) 10-60 % en poids, sur la base du poids du liant, d'un agent de réticulation de polyisocyanate. Le véhicule liquide organique mis en application dans cette composition de revêtement comprend au moins 50 % en poids, sur la base du poids du véhicule liquide organique mis en application dans la composition de revêtement, d'acétate de butyle tertiaire. On peut également utiliser ce procédé afin d'appliquer des laques, c'est-à-dire une composition de revêtement ne contenant aucun agent de réticulation, tel qu'un polyisocyanate.

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