Enhancement of iridescent colors to provide vivid colorants and

Coating processes – Particles – flakes – or granules coated or encapsulated – Applying superposed diverse coatings or coating a coated base

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427336, 427343, 427261, 427419D, 427419G, 106 23, 106291, 428324, 428404, B05D 506, C09C 128

Patent

active

040102939

ABSTRACT:
Iridescent pigments, of the type which comprise colorless micaceous substrates having thereon at least one overcoating of an essentially transparent material with a refractive index usually over about 2.0, can be enhanced in coloration by applying to them a solution of a coloring matter which possesses an absorption band complementary to the interference reflection color of the pigment, and which thereby absorbs that complementary color. The resulting vivid intensity of the iridescent coloration is far out of proportion to the concentration of the coloring matter and to the intensity of the adsorption band. The enhanced colors are useful in novel colorants, printing inks, recording systems, and copy papers.

REFERENCES:
patent: 3740244 (1973-06-01), Yano et al.
patent: 3766105 (1973-10-01), Chan
patent: 3840381 (1974-10-01), Watanabe
patent: 3861946 (1975-01-01), Waitkins et al.
patent: 3874890 (1975-04-01), Bernhard et al.
patent: 3920603 (1975-11-01), Stayner et al.

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