A powder-based coating composition, a cured film thereof,...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/03 (2006.01)

Patent

CA 2455030

The present invention is directed to a powder coating composition and a method. The method improves the color strength of a cured film of the powder- based coating composition. To produce the powder-based coating composition, the method begins by combining a powder-based binder, specifically a resin and a cross-linking agent,with a pigment and a surfactant to form a mixture. The mixture is then extruded thereby forming an extrudate of the mixture. The extrudate is cooled and then ground to produce the powder-based coating composition from the extrudate of the mixture. Next, the powder-based coating composition is spray applied to a substrate and cured to form the cured film. The surfactant in the mixture improves the color strength of the powder-based coating composition and the cured film so that the amount of pigment included in the mixture can ultimately be reduced. Additionally, certain physical properties of the cured film are not compromised.

L'invention concerne une composition de revêtement à base de poudre et un procédé associé. Ce procédé permet d'améliorer l'intensité de couleur d'un film durci de cette composition de revêtement à base de poudre. Afin de produire cette composition de revêtement à base de poudre, le procédé consiste tout d'abord à combiner un liant à base de poudre, plus spécifiquement une résine associée à un agent de réticulation, avec un pigment et un surfactant pour former un mélange. Ce mélange est ensuite extrudé pour former un extrudat du mélange. Cet extrudat est refroidi et ensuite moulu pour que la composition de revêtement à base de poudre soit produite à partir de l'extrudat du mélange. Ensuite, la composition de revêtement à base de poudre est appliquée par vaporisation sur un substrat et durcie afin de former le film durci. Le surfactant du mélange permet d'améliorer l'intensité de couleur de la composition de revêtement et du film durci de façon que la quantité de pigment comprise dans le mélange puisse être finalement réduite. En outre, certaines propriétés physiques du film durci ne sont pas compromises.

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