Press molding optical articles from acid hydrated glasses

Details Press molding optical articles from acid hydrated glasses Press molding optical articles from acid hydrated glasses

1975-12-15

1977-05-31

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 31, 65 68, 65DIG14, 106 53, C03C 1500, C03B 914

Patent

active

040266923

ABSTRACT:
A glass article having relatively high degrees of surface smoothness, durability, and light transmissivity can be made by forming a glass comprising, in mole percent on an oxide basis, 70-80% SiO.sub.2, 8-18% Na.sub.2 O and/or K.sub.2 O, and 5 to 10% of ZnO and/or PbO; hydrating the glass under acidic conditions to include a water content of up to 12% by weight while reducing the alkali content; reacting the hydrated glass with a HF-containing solution to remove up to 30 weight % of the glass; dehydrating the glass, if necessary, to reduce the total water content to a range of 3 to 7 weight percent; and pressure molding the glass under conditions sufficient to impart an optical quality surface smoothness of a die to the glass surface.

REFERENCES:
patent: 3149946 (1964-09-01), Elmer
patent: 3278285 (1966-10-01), Pickering
patent: 3290193 (1966-12-01), Salzle
patent: 3653864 (1972-04-01), Rothermel et al.
patent: 3833347 (1974-09-01), Angle et al.
patent: 3912481 (1975-10-01), Bartholomew et al.
patent: 3938974 (1976-02-01), Macedu et al.

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