Method of preparing photochromic glass

Details Method of preparing photochromic glass Method of preparing photochromic glass

1980-08-11

1982-09-14

Fisher, Richard V.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 3011, 65 32, 501 77, C03B 3200, C03C 326, C03C 330

Patent

active

043496342

ABSTRACT:
A process for producing a photochromic glass which will exhibit a brown coloration in its darkened state without a degradation in the photochromic properties of the glass taking place. The process includes the steps of forming a batch of specified components which include tin or a tin compound and subjecting the resultant batch to a series of glass-forming steps so as to develop photochromic properties in a glass article formed from the molten batch.
The invention also provides a photochromic glass having silver halide crystals and tin dispersed throughout the glass, the glass having in its darkened state a brown coloration which is described in accordance with the Hunter L,a,b, Color Scale System by the rectangular region having corners defined by the (a,b) co-ordinates: (5,1), (1,5), (12,16) and (16,12), the 1/2 OD FT of the glass being 120 seconds or less.

REFERENCES:
patent: 3022181 (1962-02-01), Connelly
patent: 3325299 (1977-06-01), Araujo
patent: 3892582 (1975-07-01), Simms
patent: 3920463 (1975-11-01), Simms
patent: 4017318 (1977-04-01), Pierson
patent: 4043781 (1977-08-01), DeMunn et al.
patent: 4118214 (1978-10-01), Wedding
patent: 4166745 (1979-09-01), Araujo et al.

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