Process of preparation of specific color effect pigments

Details Process of preparation of specific color effect pigments Process of preparation of specific color effect pigments

C - Chemistry, Metallurgy

30

B

C30B 29/58 (2006.01) C08L 33/04 (2006.01) C09D 5/00 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2604688

The invention provides a process of preparation photonic crystals which is distinguished by high efficiency and which provide photonic crystals having an opalescent effect of high quality; the process comprises (a) providing a dispersion of mono-disperse spheres in a liquid, (b) applying the dispersion onto a plain surface of an absorbent substrate selected from the group consisting of paper, textile and wood, and (c) removing the liquid from the dispersion on the surface to produce the photonic crystals in the form of a tightly packed and regularly arranged structure of mono-disperse spheres in the resulted particles; using the process according to the invention, it is possible to produce photonic crystals usable as pigment particles with a high optical brilliance in the color and with a color stability for the use in, e.g., coating compositions and inks.

L'invention concerne un procédé de préparation de cristaux photoniques, remarquable en ce qu'il présente un rendement élevé et fournit des cristaux photoniques d'un effet opalescent de haute qualité, ledit procédé comprenant les étapes suivantes : (a) préparation d'une dispersion de sphères mono-dispersées dans un liquide, (b) application de la dispersion sur une surface unie d'un substrat absorbant choisi dans le groupe des papiers, des textiles et du bois, et (c) élimination du liquide de la dispersion sur la surface pour produire les cristaux photoniques sous la forme d'une structure serrée et régulière de sphères mono-dispersées dans les particules formées. Le procédé conforme à l'invention permet de produire des cristaux photoniques utilisables sous forme de particules de pigment d'une coloration d'une haute brillance optique et d'une bonne stabilité à l'emploi, par exemple, des compositions de revêtement et des encres.

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