Process for preparing powder of silicon compound
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKazuyuki Matsumura, Masaaki Yamaya
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Abstract
An alkoxysilane is brought into a hydrolysis-polycondensation reaction using a fluoride salt, e.g. NaF, or a fluorine-containing silicon compound having an Si--F bond in its molecule, e.g. FSi(OCH.sub.3).sub.3, as a catalyst, to produce a powder of a silicon compound such as silica. The process reduces markedly the period of time required for the hydrolysis-polycondensation reaction and yields a porous silicon compound powder with low bulk specific gravity. The catalyst is excellent in handleability and safety.
Claims10
A process for preparing a powder of a silicon compound, comprising subjecting an alkoxysilane having the formula:
- (OR.sup.2).sub.x Si(R.sup.2).sub.4-X
- wherein X is an integer of 1 to 4, R.sup.1 and R.sup.2 are each independently an unsubstituted monovalent hydrocarbon group or a monovalent hydrocarbon group in which a part or all of the hydrogen atoms have been substituted with halogen, and said alkoxysilane comprises a monoalkoxysilane, a dialkoxysilane or both in a total amount of not more than 30% by weight of said alkoxysilane, to a hydrolysis-polycondensation reaction in the presence of at least one compound selected from the group consisting of fluoride salts and fluorine-containing silicon compounds having at least one Si--F bond.
Dependencies are inferred from the claim text.