| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a zirconia sol of a colloid region having a uniform particle size distribution and excellent in stability. SOLUTION: This manufacturing method comprises the following steps (a)-(d) and the sol in which fine zirconia particles whose average particle diameter is within a range of 5-100 nm are dispersed is manufactured; (a) a step of preparing a dispersion of a zirconium hydroxide gel by adding an aqueous alkali solution to an aqueous zirconium compound solution in the presence of a particle growth regulator, (b) a step of washing the zirconium hydroxide gel, (c) a step of hydrothermally treating a dispersion of the zirconium hydroxide gel in the presence of a particle growth regulator, (d) a step of washing the hydrothermally treated zirconium hydroxide gel. In the steps, the particle growth regulator is a carboxylic acid or a hydroxycarboxylic acid and the hydrothermal treatment is carried out within a temperature range of 100-250°C. COPYRIGHT: (C)2005,JPO&NCIPI
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