Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1992-10-02
1993-08-17
Cooper, Jack
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
502 8, 502 10, C01B 3312
Patent
active
052366839
ABSTRACT:
Disclosed are amorphous silica or silica-alumina spherical particles composed of X-ray diffractometrically substantially amorphous silica or silica-alumina, wherein individual particles have a definite spherical shape and a notched surface, the circularity (A) represented by the following formula: ##EQU1## wherein r1 stands for the radius of the circumcircle of the profile of the particle in an electron microscope photo thereof and r2 stands for the radius of the inscribed circle of the profile of the particle in the electron microscope photo, is in the range of from 0.90 to 1, the notching degree (B) represented by the following formula: ##EQU2## wherein .DELTA.t stands for the depth between the peak and trough in the radial direction of notches on the profile of the particle in the electron microscope photo and r1 is as defined above, is in the range of from 1 to 10%, and the primary particle size (2r1) determined by the electron microscope method is in the range of from 0.1 to 20 .mu.m.
REFERENCES:
patent: 4752458 (1988-06-01), Robinson
patent: 4775520 (1988-10-01), Unger et al.
patent: 5028360 (1991-07-01), Ito et al.
patent: 5128114 (1992-07-01), Schwartz
Abe Kiyoshi
Ito Toshio
Nakazawa Tadahisa
Ogawa Masahide
Suzuki Kazuhiko
Cooper Jack
Mizusawa Industrial Chemicals Ltd.
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