Waterborne primer with improved chip resistance

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/06 (2006.01) C08G 18/42 (2006.01) C08G 18/73 (2006.01) C09D 5/02 (2006.01) C09D 133/06 (2006.01)

Patent

CA 2373922

The invention provides a thermosetting aqueous primer composition that includes a polyurethane polymer, an acrylic polymer, and a crosslinking component that is reactive with at least one of the polyurethane polymer and the acrylic polymer. The polyurethane polymer has a glass transition temperature of O°C or less. The acrylic polymer has a glass transition temperature that is at least about 20°C higher than the glass transition temperature of polyurethane resin. The invention further provides a composite coating having as a primer layer a cured layer of the primer composition of the invention and having at least one topcoat layer.

L'invention concerne une composition de couche d'apprêt aqueuse thermodurcissable composée d'un polymère de polyuréthane, d'un polymère acrylique et d'un composant de réticulation qui réagit avec l'un des deux polymères au moins. Le polymère de polyuréthane a une température de transition vitreuse inférieure ou égale à 0 DEG C. Le polymère acrylique a une température de transition vitreuse supérieure d'au moins 20 DEG C à celle de la résine de polyuréthane. L'invention concerne également un revêtement composite dont la couche d'apprêt est une couche polymérisée, obtenue à partir de la composition d'apprêt de l'invention, recouverte d'une couche de finition au moins.

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