Method for achieving a durable two-tone finish on a vehicle

B - Operations – Transporting – 05 – D

Patent

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Details

B05D 5/06 (2006.01) B05D 1/32 (2006.01) B05D 7/00 (2006.01) B05D 7/14 (2006.01)

Patent

CA 2577008

A method for producing a multilayer two-tone finish on a substrate, such as automobile and truck bodies or parts thereof, by applying an improved clearcoat composition as the exterior most coating on top of the accent color and main body color basecoats. The clearcoat composition has improved compatibility over both waterborne and solventborne basecoats. The composition includes a film-forming binder comprising a carbamate material, a curing agent, typically a monomeric melamine curing agent, and a hydroxy functional silane component. When used as a clearcoat over a standard pigmented basecoat, the resulting coating provides a substantially durable and wrinkle free appearance and excellent adhesion to waterborne and solventborne basecoats, baked or unbaked.

Cette invention concerne un procédé servant à produire un fini à deux tons multicouche sur un substrat, tel que des carrosseries d'automobile et de camion ou des parties de carrosserie, en appliquant une composition de revêtement transparent améliorée comme couche de revêtement extérieure sur les couches de base de couleur accentuée et de couleur principale de la carrosserie. La composition de la couche de revêtement transparente possède une meilleure compatibilité que les couches de base à base d'eau et à base de solvant. Cette composition contient un liant filmogène comprenant une matière carbamate, un agent de durcissement, généralement un agent de durcissement à base de mélamine monomère, et un composant au silane à fonction hydroxy. Lorsqu'il est utilisé comme revêtement transparent sur une couche de base pigmentée standard, le revêtement résultant assure un aspect extérieur essentiellement durable et sans rides et une excellente adhérence aux couches de base à base d'eau et à base de solvant, cuites ou non cuites.

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