Metal oxide/silica composite, and a cosmetic preparation...

Details Metal oxide/silica composite, and a cosmetic preparation... Metal oxide/silica composite, and a cosmetic preparation...

2005-09-27

2005-09-27

Venkat, Jyothsna (Department: 1615)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C424S059000, C424S069000, C424S617000, C424S642000, C424SDIG005, C514S944000

Reexamination Certificate

active

06949248

ABSTRACT:
The object of this invention is to provide a UV protective powder, and a cosmetic preparation in which the dispersibility of metal oxide is kept at a high level, and the UV protection activity and transparency of the preparation are satisfactorily maintained.A metal oxide/silica composite wherein metal oxide particles whose primary particle diameter is 1-1000 nm are co-dispersed finely with silica particles, and the metal oxide particles exist substantially as primary particles in the composite. The composite is preferably obtained by mixing (1) a dispersion comprising a silica sol where silica particles have a primary particle diameter of 1-150 nm, and (2) fine particles of metal oxide whose primary particle diameter is 1-1000 nm, or a sol of the same metal oxide, and the metal oxide existing as fine particles or a sol preferably consists of one, or two or more selected from a group consisting of titanium oxide, zinc oxide and cerium oxide. Also a cosmetic preparation comprising thereof is provided.

REFERENCES:
patent: 5902569 (1999-05-01), Oshima et al.
patent: 11-001411 (1999-01-01), None
patent: 11-147809 (1999-06-01), None
patent: 11-343222 (1999-12-01), None
patent: 11-349467 (1999-12-01), None

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