Amorphous silica or silica-alumina spherical particles and proce

Details Amorphous silica or silica-alumina spherical particles and proce Amorphous silica or silica-alumina spherical particles and proce

1993-02-08

1995-09-26

McFarlane, Anthony

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423332, 423335, 502 8, 502 10, 502238, C01B 3312, B01J 2112

Patent

active

054532604

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 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: 5139760 (1992-08-01), Ogawa et al.
patent: 5236483 (1993-08-01), Nakazawa et al.

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