| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a zirconia sol in a colloid region having a uniform particle size distribution and being excellent in stability. SOLUTION: A method to manufacture the sol in which fine zirconia particles whose mean particle diameter is 5-100 nm are dispersed comprises steps (a)-(e); (a) a step to prepare the dispersion liquid of a zirconium hydroxide gel by adding an alkali aqueous solution in a zirconium compound aqueous solution in the presence of a particle growth regulator, (b) a step to wash the zirconium hydroxide gel, (c) a step to age the dispersion liquid of the washed zirconium hydroxide gel, (d) a step to wash the aged zirconium hydroxide gel and (e) a step to treat the washed dispersion liquid of the zirconium hydroxide gel hydrothermally in the presence of the particle growth regulator. The particle growth regulator is a carboxylic acid or a hydroxycarboxylic acid and the hydrothermal treatment is performed in the range of 100-250°C. COPYRIGHT: (C)2006,JPO&NCIPI
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