Title:
微粒子酸化けい素・酸化セリウム複合体の製造方法
Document Type and Number:
Japanese Patent JP3981483
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a UV light-shielding agent having a high UV light-shielding effect and further having transparency and high whiteness. SOLUTION: This ultrafine metal oxide.cerium oxide complex has an L* value (as whiteness degree) of >=80 evaluated by L*a*b* system, an a* value of <=4 (as an absolute value), and a b* value of <=10 (as an absolute value). The complex is obtained by reacting a cerium salt aqueous solution with an alkali under conditions of <=40 deg.C an a pH value of >=9, mixing the produced cerium hydroxide with an oxidizing agent at <=60 deg.C at a pH value of <8, and then compounding the product with a metal oxide. The complex may also be obtained by simultaneously dropwisely adding the alkali and the oxidizing to the cerium salt aqueous solution under conditions of <=40 deg.C and a pH value of >=9, adjusting the reaction product to conditions of >=40 deg.C and a pH value of <8, and then compounding the product with the metal oxide. The ultrafine metal oxide.cerium oxide complex can be added to a resin composition or cosmetic to impart a UV light-shielding effect thereto.
Inventors:
Nobuyoshi Yabe
Kota Tofukuji
Shigeyoshi Momose
Sakae Yoshida
Kazuyuki Tahira
Tsugio Sato
Kota Tofukuji
Shigeyoshi Momose
Sakae Yoshida
Kazuyuki Tahira
Tsugio Sato
Application Number:
JP37355398A
Publication Date:
September 26, 2007
Filing Date:
December 28, 1998
Export Citation:
Assignee:
Kose Inc.
Daito Kasei Co., Ltd.
Daito Kasei Co., Ltd.
International Classes:
A61K8/19; C01F17/00; A61K8/00; A61K8/25; A61K8/26; A61K8/28; A61K8/29; A61K8/30; A61K8/33; A61Q1/00; A61Q1/04; A61Q1/06; A61Q1/12; A61Q17/04; C01B13/14; C01B33/12; C08K3/22; C08L101/00; C09K3/00
Domestic Patent References:
| JP9118610A | ||||
| JP63277281A | ||||
| JP11180829A |
Attorney, Agent or Firm:
Hiroshi Tanaka
Eishiro Higuchi
Eishiro Higuchi