Curable coating compositions containing blends of...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 201/02 (2006.01) C08J 3/24 (2006.01) C09D 175/00 (2006.01)

Patent

CA 2349383

The present invention provides a curable coating composition that includes at least three components. The coating composition includes a component (a) having at least one carbamate group or urea group and having a lactone or hydroxy carboxylic acid moiety. The second component (b) of the coating composition is one or more of three materials. First, the second component can be a polymer resin (b)(1) comprising active hydrogen-containing functional groups reactive with the third component (c). Secondly, the second component can be a compound (b)(2) having at least one carbamate group or terminal urea group according to the invention and having at least two linking groups that are urethane or urea. Finally, the second component can be a compound (b)(3) having at least two groups selected from carbamate groups, terminal urea groups, or combinations of the two and at least four urethane or urea linking groups. The third component of the coating composition is a curing agent that is reactive with the first two components. Preparation of coated articles using the compositions of the invention is also disclosed.

La présente invention concerne une composition de revêtement durcissable contenant au moins trois constituants. La composition de revêtement comprend un constituant (1) ayant au moins un groupe carbamate ou un groupe urée et ayant une fraction lactone ou acide hydroxycarboxylique. Le second constituant (b) de la composition de revêtement est un ou plusieurs de trois matériaux. Premièrement, le second constituant peut être une résine polymère (b)(1) comprenant des groupes fonctionnels contenant de l'hydrogène réagissant avec le troisième constituant (c), deuxièmement, le second constituant peut être un composé (b)(2) ayant au moins un groupe carbamate ou un groupe urée terminal selon l'invention et ayant au moins deux groupes de liaison lesquels sont l'uréthane ou l'urée. Enfin, le second constituant peut être un composé (b)(3) ayant au moins deux groupes choisis parmi des groupes carbamate, des groupes urée terminaux ou des combinaisons des deux et d'au moins quatre groupes de liaison uréthane ou urée. Le troisième constituant de la composition de revêtement est un agent de durcissement réagissant avec les deux premiers constituants. L'invention concerne également la préparation d'articles revêtus à l'aide des compositions de l'invention.

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