Title:
ULTRAVIOLET RAY-BLOCKING COMPOSITE FINE PARTICLE, ITS PRODUCTION AND COSMETIC
Document Type and Number:
Japanese Patent JP3848697
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain ultraviolet rays-blocking composite fine particles having high transparency with visible light and light blocking property in ultraviolet ray area.
SOLUTION: The composite fine particles having ≤0.5μm average particle diameter are obtained by the following steps (a) to (c). (a) A mixed liquid containing a mixture of sol containing particles constituting mother particles having 0.001-0.3μm average particle diameter of primary particle or powder of the mother particle with a sol having 0.001-0.1μm average particle diameter, contaiining children particles in which band gap energy is smaller by ≥0.2eV than particles constituting mother paricles or powder of the child particles is prepared and the mixed liquid is subjected to mill treatment and/or disperse treatment under high pressure to produce composite fine particles in which child particles and/or mother particles are aggregated. (b) The composite fine particles are coated with an inorganic material by sol-gel reaction method so as not to substantially have catalytic activity. (c) The treated composite fine particles are subjected to water-repelling treatment using a water-repelling agent and then, dried and/or pulverized to provide the objective fine particles, in which child particles are dispersed and fixed at a ratio of 0.1-85vol.% into the mother particles.
Inventors:
Kentaro Oshima
Shunji Ozaki
Yoshinobu Imaizumi
Toshio Miyake
Tohru Nishimura
Den Keiichi
Tomo Sugawara
Makoto Torizuka
Shunji Ozaki
Yoshinobu Imaizumi
Toshio Miyake
Tohru Nishimura
Den Keiichi
Tomo Sugawara
Makoto Torizuka
Application Number:
JP8096596A
Publication Date:
November 22, 2006
Filing Date:
March 07, 1996
Export Citation:
Assignee:
Kao Corporation
International Classes:
A61K8/00; C09K3/00; A61K8/21; A61K8/25; A61K8/26; A61K8/29; A61Q1/00; A61Q1/04; A61Q1/06; A61Q1/10; A61Q1/12; A61Q17/04; C01B33/18; (IPC1-7): C01B33/18; A61K7/42
Domestic Patent References:
| JP1143821A | ||||
| JP5132662A | ||||
| JP3017011A | ||||
| JP2247109A | ||||
| JP3183620A | ||||
| JP63126818A | ||||
| JP59015885B1 |
Attorney, Agent or Firm:
Yoshinori Hosoda