Coating composition containing optically-variable pigment

Details Coating composition containing optically-variable pigment Coating composition containing optically-variable pigment

C - Chemistry, Metallurgy

09

D

C09D 5/29 (2006.01) B05D 5/06 (2006.01) C09B 1/62 (2006.01) C09C 1/00 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2174546

A coating composition is described comprising a polymer resin binder and optically variable thin film pigment flakes. The pigment flakes have a multilayer thin film interference structure comprising a metal reflector layer having first and second parallel planar surfaces and, disposed on at least one of said first and second planar surfaces, at least one transparent dielectric layer. The pigment flakes further have an average particle size of 5 to 40 µm and a particle size distribution where no more than 10 % of the particles have a particle size of greater than 50 µm and substantially none of the particles have a particle size of greater than 125 µm. This coating composition can be used to prepare a variety of coatings, especially color-plus-clear composite coatings such as those used in the automotive industry.

Composition pour revêtements comprenant une résine polymère comme liant et des pigments en flocons optiquement variables en couches minces. Les pigments en flocons présentent une structure interférentielle de plusieurs couches minces dont une couche métallique réflectrice à deux surfaces planes parallèles dont l'une au moins est revêtue d'une couche d'un diélectrique transparent. Les flocons de pigments ont une dimension de particule moyenne de 5 à 40 µm et une répartition granulométrique telle que 10 % d'entre elles au plus ont une dimension supérieure à 50 µm et pratiquement aucune ne présente une dimension supérieure à 125 µm. Cette composition peut servir à préparer divers revêtements, notamment les revêtements composites transparents et pigmentés utilisés dans l'industrie automobile.

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