Kao Corporation

Yukio Inomata

Satoshi Sugawara

Yasumitsu Sakuma

Masahiro Umehara

Toshio Uesaka

Koji Mine

Hiromi Nambu

Yoko Nakajima

Keigo Kajiwara

Kimikazu Fukuda

Michiya Takagi

Makoto Tsuji

Makoto Inoue

Provided are a cosmetic composition which is an O/W/Oemulsion composition and contains, in the oil phases Oand Othereof, fine metal oxide particles having ultraviolet screening ability; and a preparation process of the cosmetic composition.

Cosmetic composition

Provided is an O/W emulsion cosmetic composition, which contains the following components (A), (B) and (C):

O/W emulsion cosmetic composition

Hydrogel particles include a continuous phase portion of non-crosslinked hydrogel and disperse phase portions dispersed in the continuous phase portion. Each of the disperse phase portions contains a solid oil and a liquid oil as an oil component, and titanium oxide particles dispersed therein. The solid oil of the oil component contains a higher alcohol and a solid paraffin, and the content of the solid oil in the disperse phase portion is 1 to 12 mass %. The hydrogel particles have a volume-average particle diameter of 10 to 300 &#x3bc;m.

Hydrogel particles

The invention provides a polymer composite particle having superb blending stability even in a W/O emulsion cosmetic, a highly effective ultraviolet protection effect and a good feeling in use. The invention also relates to a method of producing the polymer composite particle and a cosmetic composition containing the polymer composite particle. A preferred polymer composite particle contains a metal oxide coated with a silicone and/or fluorine compound and has an average particle diameter of 1 &#x3bc;m or less, wherein the polymer composite particle is obtained by polymerizing a crosslinking agent with a vinyl monomer contained in an amount of 25% by weight based on 100% by weight of the sum of total of all the monomers and crosslinking agent and wherein the vinyl monomer has a solubility parameter calculated by the Fedors method of less than about 8.9. A preferred cosmetic composition may contain (A) a microparticle metal oxide having an average primary particle diameter of from 0.001 to 0.1 &#x3bc;m, and (B) a flake zinc oxide having an average primary particle size of from 0.1 &#x3bc;m to 1 &#x3bc;m and an average thickness of from 0.01 &#x3bc;m to 0.2 &#x3bc;m, which provides ultraviolet protection ability and visible-light transmittance.

Polymer composite particle comprising metal oxide and silicone and/or fluorine and method of producing the same

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Sumida-ku, Japan

Yukio Inomata