Process for producing synthetic quartz glass and synthetic...

Details Process for producing synthetic quartz glass and synthetic... Process for producing synthetic quartz glass and synthetic...

2011-07-12

2011-07-12

Daniels, Matthew J (Department: 1741)

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

C065S426000, C501S054000

Reexamination Certificate

active

07975507

ABSTRACT:
The invention provides a process for producing a synthetic quartz glass, comprising: (a) depositing fine quartz glass particles synthesized by flame hydrolysis of a glass-forming material, on a substrate, to form a porous quartz glass base; (b) presintering the porous quartz glass base; (c) heat-treating the presintered porous quartz glass base by holding it under vacuum at a temperature in the range of from 1,100° C. to below the vitrification temperature for a certain time period; and (d) heating the thus heat-treated porous quartz glass base to a temperature not lower than the vitrification temperature to obtain a synthetic quartz glass. According to the process for synthetic quartz glass production of the invention, a synthetic quartz glass having a reduced OH group amount and a uniform OH group concentration can be obtained. From the synthetic quartz glass, an optical member having excellent optical properties can be obtained.

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Machine Translation of JP 09052719A. Accessed Nov. 30, 2009. Original Japanese Publication Feb. 25, 1997.
Cambridge Glassblowing, “Glass Properties”, <http://www.camglassblowing.co.uk/gproperties.htm>.
U.S. Appl. No. 11/853,891, filed Sep. 12, 2007, Hino.

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