Method for producing optical glass

Details Method for producing optical glass Method for producing optical glass

1980-11-21

1982-04-13

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Utilizing parting or lubricating layer

65 311, 65 301, 65134, 252317, 501 12, 501 54, 501 63, C03C 304, C03C 306

Patent

active

043245765

ABSTRACT:
A method for producing optical glass, which comprises charging a mixed solution capable of forming a high-silica-content gel by hydrolysis reaction into a vessel, the inner wall face of which is composed of a material unwettable to the mixed solution, such as a fluorocarbon resin or silicone resin, causing gelation of the mixed solution in the vessel, drying the obtained gel, and heating and sintering the obtained dry gel. When electrodes are placed in the mixed solution at the gelation step and an electric voltage is applied, the time required for formation of the gel is shortened. Furthermore, at the gel-drying step, if the amount of materials evaporated from the gel is detected or the weight of the gel is measured, the detected amount of the evaporated materials or the change of the weight of the gel is fed back to a factor regulating the drying speed, such as the drying temperature to control the drying speed to an appropriate level.

REFERENCES:
patent: 3479206 (1969-11-01), Patterson
patent: 3597252 (1971-08-01), Schroder
patent: 3607197 (1971-09-01), Ballantine
patent: 3767434 (1973-10-01), Thomas
patent: 4013436 (1977-03-01), Van Der Steen
patent: 4028085 (1977-06-01), Thomas
patent: 4030938 (1977-06-01), Thomas
patent: 4098595 (1978-07-01), Lenz et al.
Yogyo-Kyokai-Shi (Japan), vol. 85, #988, S86830064F, 1977, Kamiya et al.
Yogyo-Kyokai-Shi (Japan), vol. 86, #999, S91560072, Kamiya et al., 5-1977.

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