Process for manufacturing high purity silica

Details Process for manufacturing high purity silica Process for manufacturing high purity silica

1986-06-25

1987-07-28

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423335, 423339, 423340, C01B 3312

Patent

active

046831282

ABSTRACT:
This invention deals with a process for manufacturing high purity silica which comprises making an aqueous alkali silicate solution into fine fibrous gel in a coagulant, treating the fibrous gel obtained with an acid-containing solution, and then with water to extract and remove impurities; and optionallly heating a resulting silica at a temperature of 1,000.degree. C. or higher. Thus obtained silica is preferably used as a filler, especially, the one for resin compositions for encapsulating electronic parts; etc.

REFERENCES:
patent: 3846537 (1974-11-01), Marotta
patent: 3857924 (1974-12-01), Halasz et al.
patent: 3959174 (1976-05-01), Winyall et al.
patent: 4089932 (1978-05-01), Morita et al.
Chemical Engineers' Handbook, 5th edition, 1973, Perry, p. 21-5.

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