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 18/72 (2006.01) C09D 133/00 (2006.01) C09D 151/08 (2006.01)

Patent

CA 2372202

The invention provides a thermosetting aqueous primer composition that includes a dispersed polyurethane poly-mer, an acrylic polymer emulsion polymerized in the presence of the polyurethane dispersion, 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 0°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.

La présente invention concerne une composition primaire aqueuse thermodurcissable comprenant un polymère polyuréthane dispersé, une émulsion polymère acrylique polymérisée en présence de la dispersion polyuréthane, et un agent de réticulation qui est réactif avec au moins un des éléments que sont le polymère polyuréthane et le polymère acrylique. Le polymère polyuréthane a une température de transition vitreuse de O DEG C ou moins. Le polymère acrylique a une température de transition vitreuse qui est supérieure d'au moins environ 20 DEG C à la température de transition vitreuse de la résine polyuréthane. Cette invention concerne également un revêtement composite ayant comme couche primaire une couche traitée de la composition primaire de l'invention et ayant au moins une couche de revêtement supérieure.

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