Tokuyama Soda Kabushiki Kaisha

Shigeki Yuasa

Koshi Kusumoto

Minahiro Okabayashi

Hideki Ohno

Katsumi Suzuki

Disclosed is an amorphous, spherical inorganic compound having a particle size of 0.1 to 1.0 .mu.m, which comprises as main constituents (1) an oxide of at least one metal selected from the group consisting of metals of the Groups I, II, III and IV of the Periodic Table, said metal oxide being capable of combining with silicon dioxide, and (2) silica. This amorphous, spherical inorganic compound is prepared by a process comprising adding a mixed solution containing a hydrolyzable organic silicon compound and a hydrolyzable organic compound of at least one metal (M) selected from the group consisting of metals of the Groups I, II, III and IV of the Periodic Table to an alkaline solvent capable of dissolving said organic silicon compound and said organic metal compound therein but substantially incapable of dissolving a reaction product of both the organic silicon compound and the organic metal compound therein, effecting the hydrolysis to precipitate the reaction product and, if necessary, calcining the reaction product.

Amorphous, spherical inorganic compound and process for preparation

A crystalline metal oxide in the form of a solid solution comprising an oxide of a metal of Group II of the periodic table, titanium oxide and silicon dioxide as main components and having main peaks at about 26.7.degree. and about 20.9.degree. in its Cu-K.alpha. X-ray diffraction pattern (2.theta.) and a specific refractive index. The crystalline metal oxide is produced, for example, by dissolving a compound of a metal of Group II of the periodic table, a hydrolyzable organic silicon compound and a hydrolyzable titanium compound in an organic solvent, hydrolyzing said starting compounds in said solution or after said solution is added to a separately prepared solvent incapable of dissolving the reaction product, thereby to form a sol- or gel-like product, and thereafter calcining the sol- or gel-like product at a temperature and for a period of time sufficient to crystallize said product.

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Fujisawa, Japan

Shigeki Yuasa