Silica-coated mixed crystal oxide particle, production...

Details Silica-coated mixed crystal oxide particle, production... Silica-coated mixed crystal oxide particle, production...

2008-03-25

2008-03-25

Dodson, Shelley A. (Department: 1616)

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

C424S060000, C424S400000, C424S401000

Reexamination Certificate

active

07347986

ABSTRACT:
Provided are a silica-coated mixed crystal oxide particle which has high dispersibility, excellent visible light transparency and superior ultraviolet-shielding capability and which is sufficiently reduced in the photocatalytic activity; an economical production process thereof; and an ultraviolet-shielding cosmetic material containing the silica-coated mixed crystal oxide particle, which is particularly excellent in the visible light transparency. The surface of a mixed crystal oxide particle having a BET specific surface area of 10 to 200 m2/g and containing primary particles in a mixed crystal is covered with a dense and thin film silica.

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