PROCESS OF PREPARATION OF SPECIFIC COLOR EFFECT PIGMENTS

摘要

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.