Two component coating compositions and coatings produced...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 8/30 (2006.01) C08L 33/14 (2006.01)

Patent

CA 2527084

The present invention is directed to two component coating compositions that cure under ambient conditions and more particularly to those having low VOC (volatile organic content) that are suitable for use in automotive refinish and Original Equipment Manufacturing (OEM) applications. The coating composition includes crosslinkable and crosslinking components, wherein the crosslinkable component includes a low polydispersity, low molecular weight copolymer having on an average 2 to 25 crosslinkable functional groups, such as hydroxyl, acetoacetoxy, carboxyl, epoxy, primary amine and secondary amine. The copolymer is polymerized from a monomer mixture that includes one or more non-functional methacrylate monomers and one or more functional acrylate monomers provided with the functional groups. The crosslinking component includes polyisocyanate, polyamine, epoxy, polyacid, ketimine, melamine, or a combination thereof. The invention is also directed to coating produced from the coating composition.

La présente invention concerne des compositions de revêtement à deux composants qui durcissent dans des conditions ambiantes et plus particulièrement des compositions présentant une faible VOC (teneur en composés organiques volatiles) qui sont appropriées pour être utilisées dans des applications de réfection des peintures d'automobiles et de fabrication d'équipement d'origine (OEM). La composition de revêtement comprend des composants réticulables et de réticulation, les composants réticulables comprenant un copolymère de faible polydispersité, de faible poids moléculaire, présentant en moyenne entre 2 et 25 groupes fonctionnels réticulables, tels que hydroxyl, acétoacétoxy, carboxyl, époxy, amine primaire et amine secondaire. Ledit copolymère est polymérisé à partir d'un mélange de monomères qui comprend un ou plusieurs monomères de méthacrylate non fonctionnels et un ou plusieurs monomères d'acrylate fonctionnels pourvus des groupes fonctionnels. Le composant de réticulation comprend du polyisocyanate, de la polyamine, de l'époxy, du polyacide, de la cétimine, de la mélamine, ou une combinaison de ces constituants. L'invention concerne également un revêtement produit à partir de ladite composition de revêtement.

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