Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1990-04-19
1991-07-02
Lindsay, Robert L.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 183, 65901, 501 12, C03C 2700
Patent
active
050282476
ABSTRACT:
Silica glass powders are prepared by mixing a silicic acid ester, water in an amount equal and or larger than 0.5 gram equivalent of an alkoxy group of the silicic acid ester and siliceous particles and dispersing the siliceous particles which have particle sizes larger than 400 .mu.m in an amount of less than 10% by weight and particle sizes of less than 20 .mu.m in an amount of less than 50% by weight and which are dispersed in an amount equal to or larger than 10% by weight of the weight of silica prepared by roasting the silicic acid ester in the same amount as used for the preparation of the mixture, gelling the dispersion to give a gel, drying the gel, and sintering the dried gel. The silica glass powders of high purity are suitable for various uses such as raw materials for the silica glass products for semiconductor industry and for multicomponent glass for optical communication.
REFERENCES:
patent: 4339559 (1982-07-01), McDaniel
patent: 4681615 (1987-07-01), Toki et al.
patent: 4816299 (1989-03-01), Alpha et al.
patent: 4826521 (1989-05-01), Wiechmann et al.
Encyclopedia of Chemical Technology, Kirk-Othmer, 2nd Ed. vol. 18, 1969 p. 67.
Asami Muneo
Yasueda Minoru
Chisso Corporation
Lindsay Robert L.
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