High index photochromic glasses

Details High index photochromic glasses High index photochromic glasses

1988-12-09

1990-01-02

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 406

Patent

active

048913367

ABSTRACT:
The present invention is related to transparent, fast darkening and fading photochromic glasses.
The glasses contain SiO.sub.2, B.sub.2 O.sub.3, Al.sub.2 O.sub.3, ZrO.sub.2, Li.sub.2 O, Na.sub.2 O, K.sub.2 O, MgO, CaO, SrO, BaO, ZnO, La.sub.2 O.sub.3, Nb.sub.2 O.sub.5, TiO.sub.2 as base glass components, Ag, Br, Cl, CuO as photochromic elements, with, optionally, Sb.sub.2 O.sub.3, As.sub.2 O.sub.3, and SnO.sub.2 as colorants to impart a brown color at darkening.
The glasses have a refractive index greater than 1.585, an Abbe number greater than 42, and a density lower than about 2.80 g/cm.sup.3.

REFERENCES:
patent: 3630765 (1971-12-01), Aranjo
patent: 3703388 (1972-11-01), Aranjo et al.
patent: 3999996 (1976-12-01), Faulstich et al.
patent: 4149896 (1979-04-01), Faulstich et al.
patent: 4486541 (1984-12-01), Gliemeroth et al.
patent: 4686196 (1987-08-01), Gliemeroth et al.

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