Fast-fading index-corrected photochromic glass compositions

Details Fast-fading index-corrected photochromic glass compositions Fast-fading index-corrected photochromic glass compositions

1974-11-11

1976-05-18

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106DIG6, 106 47Q, C03C 326, C03C 308, G02B 108

Patent

active

039574997

ABSTRACT:
Photochromic glasses having index of refraction values (n.sub.D) in the range from 1.52-1.54, compositions comprising, in weight percent, about 49-60% SiO.sub.2, 2-9% Al.sub.2 O.sub.3, 15-18% B.sub.2 O.sub.3, 6-12% Na.sub.2 O, 9-18% ZrO.sub.2, 0.5-0.9% Ag, 0.5-0.8% Cl, 0.010-0.030% CuO, 0.5-1% PbO, and 1-2% F, and rapid fading characteristics such that at least about 65% of the optical density gained during darkening is lost within a five-minute fading interval, are disclosed.

REFERENCES:
patent: 3197296 (1965-07-01), Eppler et al.
patent: 3419370 (1968-12-01), Cramer
patent: 3540793 (1970-11-01), Araujo
Yokota, R. "Phototropic Glass", Kotai Butsuri 1968, 3(s) 265-269 in Chemical Abstracts, Vol. 69, 1968, 72798p.

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