| abstract |
The present invention has a fine average particle size and a high specific surface area, and also has an oil absorption amount in which a proportional relationship is established between the specific surface area, and thus has a high effective surface area and is highly dispersible in a resin. An excellent fine zirconium oxide powder and a method for producing the same are provided. According to the present invention, fine zirconium oxide powder having an average particle size of 30 nm or less, a specific surface area greater than 35 m 2 / g, and an oil absorption greater than 40 mL / 100 g is provided. Such zirconium oxide fine powder is obtained by, for example, reacting a water-soluble zirconium salt with an alkali in water containing a treatment agent such as citric acid to obtain an aqueous slurry of an amorphous precipitate. Is filtered and washed with water to obtain an amorphous precipitate, which is then again made into an aqueous slurry, to which a treating agent such as sodium borate is added, and the resulting aqueous slurry is hydrothermally treated. Can be obtained. [Selection figure] None |