Reversible light-sensitive glass

Details Reversible light-sensitive glass Reversible light-sensitive glass

1974-07-31

1976-03-02

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 54, 106DIG6, C03C 300

Patent

active

039416054

ABSTRACT:
A reversible light-sensitive glass, e.g., for eyeglasses, comprising 100 parts of a base glass composition consisting, in weight percent, of 48 to 62% SiO.sub.2, 15 to 22% B.sub.2 O.sub.3, 0 to 11% Al.sub.2 O.sub.3, 0 to 10% ZrO.sub.2, 6<Al.sub.2 O.sub.3 + ZrO.sub.2 <13%, 6 to 16% R.sub.2 O where R represents Li, Na or K, 0.5 to 7% BaO, BaO/R.sub.2 O 0.035 to 0.65, 0 to 2% TiO.sub.2, 0 to 2.5%Nd.sub.2 O.sub.3, 0 to 2.5% Ho.sub.2 O.sub.3, 0 to 2.5% Er.sub.2 O.sub.3, 0.2<Nd.sub.2 O.sub.3 + Ho.sub.2 O.sub.3 + Er.sub.2 O.sub.3 <2.5% and 0.002 to 0.03%CuO, and as light-sensitive components 0.15 to 1.0 part of Ag and more than the Ag chemical equivalent of halogens selected from the group consisting of Cl, Br and I.

REFERENCES:
patent: 2805166 (1957-09-01), Lojfler
patent: 3208860 (1965-09-01), Armstrad
patent: 3269847 (1966-08-01), Chen
patent: 3328182 (1967-06-01), Araujo
patent: 3419370 (1968-12-01), Cramer
patent: 3594198 (1971-07-01), Sperry
patent: 3706688 (1972-12-01), Matsuma
patent: 3795523 (1974-03-01), Moreya

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