Multi-layer effect pigment

Details Multi-layer effect pigment Multi-layer effect pigment

C - Chemistry, Metallurgy

09

C

C09C 1/00 (2006.01) C09D 5/36 (2006.01)

Patent

CA 2512875

A multilayer effect pigment includes a transparent substrate, a layer of high refractive index material on the substrate, and alternating layers of low refractive index and high refractive index materials on the first layer, the total number of layers being an odd number of at least three, all adjacent layers differing in refractive index by at least about 0.2 and at least one of the layers having an optical thickness which is different from all of the other layers. The resulting multi-layer effect pigment is not a quarter wave stack.

L'invention concerne un pigment à effet multicouche comprenant un substrat transparent, une couche d'un matériau à indice de réfraction élevé sur le substrat, et, en alternance, des couches de matériaux à indice de réfraction faible et élevé sur la première couche, le nombre total de couches étant un chiffre impair d'au moins trois, toutes les couches adjacentes ayant un indice de réfraction différente d'au moins 0,2 et au moins une des couches présentant une épaisseur optique qui est différente de toutes les autres couches. Le pigment à effet multicouche obtenu n'est pas une pile quart d'onde.

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