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Title:
ULTRA-FINE PARTICLES OF ZINC OXIDE, METHOD FOR PREPARING THE SAME AND COSMETIC COMPRISING THE SAME
Document Type and Number:
WIPO Patent Application WO/2000/046152
Kind Code:
A1
Abstract:
Ultra-fine particles of zinc oxide which have a specific surface area of 10 to 200 m?2¿/g as measured by one point BET method, have primary particles being substantially isotropic with respect to the form thereof, characterized in that it has a specific volume of 4 to 40 ml/g as measured by means of a tapping machine; a method for preparing the same; and a cosmetic comprising the same. The ultra-fine particles have a reduced degree of aggregation of primary particles and thus can be extremely easily dispersed into and suspended in an aqueous solvent with no pulverization steps or through a simple dry pulverization, can be suitably used, for example, as a powder for a cosmetic, and further have both of feeling of transparency and ultraviolet ray-shielding function.

Inventors:
KOGOI HISAO (JP)
TANAKA JUN (JP)
YAMAYA HAYATO (JP)
Application Number:
PCT/JP2000/000621
Publication Date:
August 10, 2000
Filing Date:
February 04, 2000
Export Citation:
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Assignee:
SHOWA DENKO KK (JP)
KOGOI HISAO (JP)
TANAKA JUN (JP)
YAMAYA HAYATO (JP)
International Classes:
A61K8/25; A61K8/27; A61Q1/02; A61Q17/04; A61Q19/00; C01G9/02; C01G9/03; C09C1/04; (IPC1-7): C01G9/02
Foreign References:
JPH07118133A1995-05-09
JPH01286919A1989-11-17
JPH0725614A1995-01-27
US5560871A1996-10-01
JPH10167929A1998-06-23
Other References:
See also references of EP 1172334A4
Attorney, Agent or Firm:
Fukuda, Kenzo (6-13 Nishishinbashi 1-chom, Minato-ku Tokyo, JP)
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