Process for manufacture of metal oxide

Details Process for manufacture of metal oxide Process for manufacture of metal oxide

1987-12-24

1989-08-29

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423335, 423592, 423604, 423608, 423610, 423618, 423619, 423622, 423624, 423625, 423635, 423636, 423641, C04B 3500

Patent

active

048615722

ABSTRACT:
An improved process for the manufacture of a metal oxide is disclosed. In the process wherein a hydrolyzable organometallic compound is hydrolyzed by an alkaline hydrolyzing agent in an alkaline organic solvent, and thereafter, the metal oxide is formed by a condensation reaction of a metal hydroxide resulting from the hydrolysis of the organometallic compound, the improvement comprises feeding the organometallic compound and the hydrolyzing agent into the organic solvent so that a concentration of the hydrolyzed compound is initially above a critical level of supersaturation, and thereafter, is maintained in a range from above an upper limit of solubility to the critical level of super-saturation. According to the above process, the metal oxide can be obtained in the form of a powder material with a uniform particle size distribution.

REFERENCES:
patent: 4177251 (1979-12-01), Bendig et al.
patent: 4357427 (1982-11-01), Ho et al.
patent: 4543341 (1985-09-01), Barringer et al.
patent: 4619908 (1986-10-01), Cheng et al.
patent: 4732750 (1988-03-01), Olson et al.
"Metal Alkoxides for Sol-Gel Applications" by Jim Johnston, Dynamit Nobel Chemicals, received by Patent and Trademark Office on Nov. 6, 1987.
Chemical Abstracts 104:134796p.
Chemical Abstracts, vol. 105, No. 22, Dec. 1986, p. 163, Abstract No. 193842u, Columbus, Ohio, U.S.A. and JP-A-61 141 604 (Tokuyama Soda Co. Ltd.) 6-28-1986.
Report of the National Institute for Research in Inorganic Materials, Science and Technology Agency, T. Shimohira, No. 14, pp. 49-58, 1977.

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