Silica particles and process for producing the same

Details Silica particles and process for producing the same Silica particles and process for producing the same

1990-12-11

1993-07-27

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

264 42, 264 43, 423335, 423338, 423339, 423470, 428402, B32B 516

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active

052309533

ABSTRACT:
Silica particles having an average particle size of 5 to 100 .mu.m, a BET specific surface area of not more than 20 m.sup.2 /g and a pore volume of not more than 0.1 ml/g, each of which has on its surface a plurality of protuberances with a smooth configuration , a diameter at half the protuberance height of the said protuberance being 0.2 to 5.0 .mu.m and a height of the said protuberance being 0.2 to 4.0 .mu.m, and a process for producing the silica particles, which comprises (A) reacting hydrosilicofluoric acid, ammonium silicofluoride or a mixture thereof with ammonia in an aqueous medium to form a silica slurry, (B) separating a silica from the silica slurry, and (C) calcining, after optionally drying, the separated silica at a temperature of not less than 500.degree. C.

REFERENCES:
patent: 1859998 (1932-05-01), Svendsen
patent: 1959749 (1934-05-01), Svendsend
patent: 3021194 (1962-02-01), Cunningham
patent: 4010242 (1977-05-01), Iler et al.
patent: 4508607 (1985-04-01), Winyall
patent: 4681750 (1987-07-01), Johnson et al.
patent: 5030433 (1991-07-01), Mehrotra
Chemical Abstracts, vol. 112, No. 6, Feb. 5, 1990, p. 206, abstract No. 39254s, Columbus, Ohio, U.S.; JP-A-01145318 (Nippon Steel Chem. Co., Ltd.) Jul. 6, 1989.
Patent Abstracts of Japan, vol. 12, No. 181 (C-499) (3028), May 27, 1988, and JP-A 62288110 (Daiki Rubber Kogyo K.K.) Dec. 15, 1987.

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