Title:
SILICON OXIDE-COATED ZINC OXIDE AND METHOD FOR PREPARING SAME, AND COMPOSITION AND COSMETIC MATERIAL CONTAINING SILICON OXIDE-COATED ZINC OXIDE
Document Type and Number:
WIPO Patent Application WO/2016/076350
Kind Code:
A1
Abstract:
The present invention provides: a silicon oxide-coated zinc oxide in which the elution of zinc ions is suppressed even when the zinc oxide is coated with silica formed from an alkali metal silicate salt; a method for preparing the same; and a composition and a cosmetic material which contain the silicon oxide-coated zinc oxide. This silicon oxide-coated zinc oxide is formed by coating the surfaces of zinc oxide particles with a silicon oxide film, wherein the average primary particle diameter of the zinc oxide particles is over 50 nm to 500 nm, and when the silicon oxide-coated zinc oxide is kept for one hour in a buffer solution having a pH of 5, the elution rate S, defined by equation (1), of zinc oxide is 50% or less. (1) Elution rate S = (amount of eluted zinc oxide)/(amount of zinc oxide in silicon oxide-coated zinc oxide).
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Inventors:
SUMA SYUNSUKE (JP)
ITAGAKI TETSURO (JP)
MATSUSHITA HIROKAZU (JP)
ITAGAKI TETSURO (JP)
MATSUSHITA HIROKAZU (JP)
Application Number:
PCT/JP2015/081720
Publication Date:
May 19, 2016
Filing Date:
November 11, 2015
Export Citation:
Assignee:
SUMITOMO OSAKA CEMENT CO LTD (JP)
International Classes:
C01G9/02; A61K8/27; A61Q1/04; A61Q1/08; A61Q1/10; A61Q17/04; A61Q19/00
Domestic Patent References:
| WO2014171322A1 | 2014-10-23 |
Foreign References:
| JPH10130021A | 1998-05-19 | |||
| JPH08104512A | 1996-04-23 | |||
| JPH11302015A | 1999-11-02 | |||
| JPH0789710A | 1995-04-04 |
Other References:
H. WANG ET AL.: "Effect of Polyelectrolyte Dispersants on the Preparation of Silica-Coated Zinc Oxide Particles in Aqueous Media", J. AM. CERAM. SOC., vol. 85, no. Issue 8, 2002, pages 1937 - 1940, XP009143705
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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