Process for producing silica glass

Details Process for producing silica glass Process for producing silica glass

1997-02-03

1999-02-16

Group, Karl

Glass manufacturing

Processes

Sol-gel or liquid phase route utilized

501 12, C03B 802

Patent

active

058715584

ABSTRACT:
A silica glass production process that can prevent cracks from occurring during the step of gel drying. In a process for producing silica glass, comprising the steps of subjecting a partial polycondensation product of alkoxysilane to hydrolysis in the presence of a solvent, an organic polymeric compound and a basic catalyst to form a sol, making the sol into a gel, drying the gel to form a dry gel, and firing the dry gel to obtain a glass, a salt is caused to exist in a concentration not less than 1.times.10.sup.-4 mol based on 100 g of the partial polycondensation product of alkoxysilane in the step of subjecting the partial polycondensation product of alkoxysilane to hydrolysis to form a sol.

REFERENCES:
patent: 5196382 (1993-03-01), Hench et al.
patent: 5236483 (1993-08-01), Miyashita et al.

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