Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Mica flake
Reexamination Certificate
1998-12-29
2001-06-05
Krynski, William (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Mica flake
C428S403000, C428S689000, C428S702000
Reexamination Certificate
active
06242092
ABSTRACT:
THIS INVENTION CLAIMS THE PRIORITY OF JAPANESE PATENT APPLICATION NO. HEISEI 8-60197, FILED FEB. 21, 1996, WHICH IS INCORPORATED HEREIN BY REFERENCE.
TECHNICAL FIELD
The present invention relates to a zinc oxide-coated material and in particular, relates to the improvement of its fatty acid-solidifying ability.
BACKGROUND ART
Sebum is always eliminated from human skim Sebum gives horny layer moisture and flexibility, and further prevents inrush of injurious material and bacteria from outside and discharge of the material such as water from body, in the human skin which is normally kematinized.
However, sebum causes cosmetics which are applied on the skin to be fallen off the skin, a so-called cosmetic crumbling effect Sebum also causes oily gloss on the skin.
Various methods have been used for controlling the action of sebum on the skin. For example, kaolin, calcium carbonate, magnesium carbonate, and the like are excellent in absorbing perspiration or sebum. Further, powders, such as porous globular silicic anhydride, porous cellulose powder, and the like, which have sebum absorptivity are used.
Among these powders, zinc white, in particular, has sebum solidifying ability. It can effectively prevent cosmetic crumbling.
However, zinc oxide has a fault which is inferior in spreadability.
The coefficient of friction of zinc oxide is about 0.60, which is considerably high as compared with other powders used in cosmetics. Accordingly, the spreadability and usability of cosmetics are remarkably lower in the case where a large amount of zinc oxide is compounded.
The present inventors are planning the improvement of the spreadability by separating zinc oxide on fine flake powder such as mica.
However, the inventors has faced with the problem that the sebum-solidifying ability of zinc oxide disappears, in the case where zinc oxide is separated on mica and the like.
DISCLOSURE OF INVENTION
In view of the above-mentioned problems in the prior art, an object of the present invention is to provide a powder and an external preparation for skin using the same which has good spreadability without spoiling fatty acid-solidifying ability of zinc oxide-coated material.
As a result of diligent studies by the inventors for attaining the above-mentioned objects, the inventors found that the usability of zinc oxide can be improved without spoiling fatty acid-solidifying ability by separating zinc oxide on a substrate with specific separation form Accordingly, the present invention has been accomplished.
Namely, a zinc oxide-coated material in accordance with the present invention is characterized in that an amorphous state of zinc oxide is coated on a substrate.
Preferably, the substrate is a fine flake.
Preferably, the fine flake is mica.
Preferably, the fine flake is titanium oxide coated mica.
Preferably, the fine flake is iron oxide-coated titanium oxide coated mica.
Preferably, the amount of zinc oxide is in the range of 1 to 8%.
A fatty acid-solidifying powder in accordance with the present invention is composed of a zinc oxide-coated material.
An external preparation for skin in accordance with the present invention is compounded with a fatty acid& solidifying powder.
A process for manufacturing a zinc oxide-coated material in accordance with the present invention comprises mixing a substrate in zinc halide water solution which is adjusted pH 11 to 13 and separating zinc oxide generated by hydrolyzing zinc halide on the substrate.
In addition, in said process for manufacturing the zinc oxide-coated material, it is preferable that the separation of zinc oxide from the substrate is conducted by adding zinc halide or alkaline water solution to the water solution where the substrate is dispersed, to adjust pH to the prescribed value of 11 to 13.
REFERENCES:
patent: 3087828 (1963-04-01), Linton
patent: 4207377 (1980-06-01), Kindrick
patent: 58-52651 (1983-03-01), None
patent: 8-32094 (1996-02-01), None
patent: WO 94/01498 (1994-01-01), None
Derwent Publications Ltd., London, GB, AN 93-071009, Tayca Corp., “Flaky pigment compsn. for high dispersibility in cosmetic material—prepd by coating surface of flaky pigment with titanium oxide and coating with zinc oxide, for ultraviolet A beam shielding.”.
Derwent Publications Ltd., London, GB, An 93-232556, Teika KK, Flaky pigment compsn. for cosmetics with low surface gloss—comprises flake surface coated titanium oxide or titanium-zinc composite oxide and zinc oxide.
Katsuyama Tomoyuki
Kimura Asa
Watanabe Naoko
Krynski William
Shewareged B.
Shiseido Co. Ltd.
Snider Ronald R.
Snider & Associates
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