Rare earth metal sulfide pigment compositions

Details Rare earth metal sulfide pigment compositions Rare earth metal sulfide pigment compositions

1994-04-18

1995-03-28

Klemanski, Helene

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106403, 106404, 106437, 106439, 106450, 106451, 106482, 423263, C09C 102

Patent

active

054013097

ABSTRACT:
Novel colorant/pigment compositions, prepared via precipitation technique and well suited for the coloration of a wide variety of materials and substrates, e.g., plastics, paints and inks, ceramics, cosmetics, etc., comprise composite core/sheath particulates, the cores of which comprising particles of at least one crystalline rare earth metal sesquisulfide having the formula M.sub.2 S.sub.3 in which M is at least one lanthanide element having an atomic number of from 57 to 71, or yttrium, and such core particles having at least one alkali and/or alkaline earth metal dopant at least in part incorporated within the crystal lattice of the at least one crystalline rare earth metal sesquisulfide, and each sheath comprising a coating layer of at least one transparent oxide deposited onto the external face surfaces of the doped core particles.

REFERENCES:
patent: 4545967 (1985-10-01), Reynolds et al.
patent: 4765931 (1988-08-01), Saunders et al.
patent: 5348581 (1994-09-01), Chopin et al.

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