C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
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 2455788
A crosslinking agent is provided which is an ungelled reaction product of (a) an aminoplast resin and (b) a compound having active hydrogen groups reactive with the aminoplast resin (a) such that the crosslinking agent is essentially free of functional groups reactive with aminoplast resin and has a glass transition temperature of at least 10~C. Also provided is a method for preparing the crosslinking agent. Further provided is a curable powder coating composition including (A) a polymer having a glass transition temperature of at least 30~C containing reactive functional groups and (B) the previously described crosslinking agent. Additionally provided is a multilayer composite coating composition including a base coat deposited from a film-forming composition and a top coat over the base coat deposited from the previously described powder coating composition. Coated substrates are also provided.
Agent de réticulation qui est le produit de réaction non gélifié (a) d'une résine aminoplaste et (b) d'un composé dont les groupes hydrogènes actifs réagissent avec la résine aminoplaste (a) de telle sorte que cet agent est pour l'essentiel exempt de groupes fonctionnels réagissant avec la résine aminoplaste, et possède température de transition vitreuse d'au moins 10 ·C. Procédé d'obtention de l'agent de réticulation. Composition de revêtement en poudre durcissable comprenant (A) un polymère à température de transition vitreuse d'au moins 30 ·C, renfermant des groupes fonctionnels réactifs, et (B) agent de réticulation susdécrit. Composition de revêtement composite multicouche comprenant une couche de base déposée à partir d'une composition filmogène, sur laquelle est déposée une couche de la composition en poudre susdécrite. Substrats enduits.
Ambrose Ronald R.
Chasser Anthony M.
Hu Shengkui
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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