Process for producing photochromicity in untreated glasses of su

Details Process for producing photochromicity in untreated glasses of su Process for producing photochromicity in untreated glasses of su

1973-06-19

1976-02-17

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, 65117, 65DIG2, C03B 2500, C03C 2100

Patent

active

039389774

ABSTRACT:
Photochromic glass compositions are photochromically activated by immersion in a hot liquid bath at activation and/or annealing temperatures to provide improved thermal efficiency and control of the degree of activation, making possible the rapid production of uniform photochromic glass products. The hot liquid bath is a molten salt bath having a density very close to that of the glass composition. A silver salt may be employed in the salt bath to prevent silver diffusion from the glass, the required amount of silver being already present in the glass prior to its immersion in the salt bath. The glass is not simultaneously ion exchanged during the annealing process in order to tint and/or strengthen the glass. Coloring may be effected.

REFERENCES:
patent: 3208860 (1965-09-01), Armistead et al.
patent: 3282770 (1966-11-01), Stookey et al.
patent: 3317297 (1967-05-01), Ray
patent: 3357876 (1967-12-01), Rinehart
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3451797 (1969-06-01), Meth
patent: 3464807 (1969-09-01), Pressau
patent: 3493963 (1970-02-01), Buckley
patent: 3524739 (1970-08-01), Loukes et al.
patent: 3544437 (1970-12-01), Loukes et al.
patent: 3628934 (1971-12-01), Duthoit

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