Title:
SPINDLE-SHAPED FINE PARTICLE TITANIUM DIOXIDE AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3732265
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a spindle-shaped fine particle titanium dioxide excellent in ultraviolet light screening properties, by treating an aqueous suspension of hydrous titanium oxide with an alkali, then adding hydrochloric acid under a specific condition, heating and aging.
SOLUTION: Hydrous titanium oxide is treated with an alkali, then the prepared reaction product is reacted with 0.1-2mols based on 1mol of titanium oxide in the reaction product of hydrochloric acid by instant mixing, then heated and aged at ≤80°C. Then the reaction product is reacted with 0.1-2mols based on 1mol of titanium oxide of hydrochloric acid by instant mixing, heated and aged at ≥85°C. Consequently, the objective spindle-shaped fine particle titanium dioxide having 0.15-0.25μm length, 3-9 axial ratio and 80-120m2/g specific surface area is obtained.
Inventors:
Hideo Futamata
Hideo Takahashi
Akito Sakai
Masakazu Hattori
Hideo Takahashi
Akito Sakai
Masakazu Hattori
Application Number:
JP35140995A
Publication Date:
January 05, 2006
Filing Date:
December 25, 1995
Export Citation:
Assignee:
Ishihara Sangyo Co., Ltd.
International Classes:
A61K8/00; C01G23/053; A61K8/25; A61K8/26; A61K8/29; A61Q17/04; C08K3/22; C08L101/00; C09D5/00; C09D5/32; C09K3/00; (IPC1-7): C01G23/053; A61K7/42; C08K3/22; C08L101/00; C09D5/32; C09K3/00
Domestic Patent References:
| JP7165423A | ||||
| JP4214030A |
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