| 摘要 |
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 deg.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 deg.C. Consequently, the objective spindle-shaped fine particle titanium dioxide having 0.15-0.25μm length, 3-9 axial ratio and 80-120m<2> /g specific surface area is obtained.
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