Preparation of bluish luster pigments

Details Preparation of bluish luster pigments Preparation of bluish luster pigments

1996-03-26

1997-04-29

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106415, 106436, 428363, 428404, 428406, C09C 100, C04B 1420

Patent

active

056244878

ABSTRACT:
Preparation of bluish luster pigments by treating titania-coated silicatic platelets with a reducing gas mixture, which comprises treating titania-coated silicatic platelets whose titania coating has a geometric layer thickness of from 10 to 60 nm at from 800.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia, and also bluish luster pigments based on silicatic platelets comprising a reduced titania coating with a geometric layer thickness of from 10 to 60 nm and CIELAB color coordinates -2.ltoreq.a*.ltoreq.2 and b*.ltoreq.-20 (measuring angle 20.degree., standard illuminant D65).

REFERENCES:
patent: 4623396 (1986-11-01), Kimura et al.
patent: 4948631 (1990-08-01), Ostertag et al.
patent: 4978394 (1990-12-01), Ostertag et al.
Patent Abstracts of Japan, vol. 9, No. 78 (C-274), Apr. 6, 1985, JP-A-59 212422, Dec. 1, 1984.

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