Modified aminoplast crosslinkers and powder coating...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 12/40 (2006.01) C08G 12/26 (2006.01) C09D 5/03 (2006.01) C09D 161/26 (2006.01) C09D 161/32 (2006.01)

Patent

CA 2453386

A crosslinking agent which is an ungelled reaction product of (a) at least one aminoplast resin, (b) at least one polyfunctional polymer having functional groups reactive with aminoplast resin (a) and having a glass transition temperature of at least 15~C; and (c) at least one compound different from (b) having active hydrogen groups reactive with aminoplast resin (a) is provided. Also provided is a method for preparing the crosslinking agent. Further provided is a powder coating composition which includes the crosslinking agent. Additionally provided is a multi-layer composite coating composition having a base coat layer and a top coat over the base coat deposited from the previously described powder coating composition. Coated substrates are also provided.

L'invention concerne un agent de réticulation constitué par le produit de réaction non gélifié de: (a) au moins une résine aminoplaste; (b) au moins un polymère polyfonctionnel contenant des groupes fonctionnels réagissant avec ladite résine aminoplaste (a), qui présente une température de transition vitreuse d'au moins 15 ·C; et (c) au moins un composé différent de (b), qui contient des groupes hydrogène actifs réagissant avec ladite résine aminoplaste (a). L'invention concerne également un procédé de préparation dudit agent de réticulation. L'invention concerne encore une composition de revêtement en poudre contenant ledit agent de réticulation. L'invention concerne également une composition de revêtement composite multicouches comprenant une couche de revêtement de base et une couche supérieure disposée par dessus de ladite couche de base, formées à partir de la composition de revêtement en poudre décrite ci-dessus. L'invention concerne enfin des substrats revêtus.

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