POROUS SPHERICAL SILICA, CATALYST CARRIER, COSMETIC, ANALYTICAL COLUMN, POLISH, RESIN COMPOSITION, AND METHOD OF PRODUCING POROUS SPHERICAL SILICA

Abstract: provided are an independent porous spherical silica such that the alkali metal content is reduced, the hardness of the particles is increased, and the number of shred particles is reduced; and a method of producing such a silica. in the porous spherical silica, the diameter (d50) of volume based particle size distribution is 2 �m to 200 �m, the ratio (d10/d90) of the diameter (d10) to the diameter (d90) is at least 0.3, the pore volume is 0.5 to 8 ml/g, the mode pore radius is 5 to 50 nm, the specific surface area is 50 to 400 m/g, and the arithmetic mean value of “compressive test forces when specimens are found to break” obtained according to jis z8844 is 1.0�10to 2.0�10mn, the number of particles each having a circularity of at most 0.7 is at most 20, and the alkali metal content is at most 50 ppm.

Inventor(s): Noriko YOSHIMURA

CPC Classification: C01B33/186 (Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels ; treatment to enhance the pigmenting or filling properties ))

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