Compositions for multilayer coating and resins therefore

C - Chemistry – Metallurgy – 09 – D

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C09D 175/06 (2006.01) B05D 1/36 (2006.01) C09D 201/00 (2006.01)

Patent

CA 2754354

A 2K basecoat clearcoat system includes a solvent borne basecoat having a low Tg branched polyester polyol, optionally, a high Tg, high molecular weight thermoplastic resin, and a hardener that includes an isocyanate functional material suitable for crosslinking the polyester polyol, and optional thermoplastic resin. The solvent borne clearcoat composition includes a low Tg linear or branched polyester polyol, at least one other multi- functional polyol, and an isocyanate functional material suitable for crosslinking the polyester and multi-functional polyols.

L'invention porte sur un système de vernis de couche de fond 2K, lequel système comprend une couche de fond portée dans un solvant qui contient un polyester polyol ramifié à faible Tg, facultativement, une résine thermoplastique de masse moléculaire élevée à Tg élevée, et un durcisseur qui contient un matériau fonctionnel isocyanate approprié pour réticuler le polyester polyol, et une résine thermoplastique facultative. La composition de vernis portée dans un solvant contient un polyester polyol linéaire ou ramifié à faible Tg, au moins un autre polyol multifonctionnel, et un matériau fonctionnel isocyanate approprié pour réticuler le polyester et les polyols multifonctionnels.

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