Boron-free silver halide photochromic glasses

Details Boron-free silver halide photochromic glasses Boron-free silver halide photochromic glasses

1975-07-16

1976-05-18

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106DIG6, C03C 304, C03C 326

Patent

active

039574989

ABSTRACT:
Clear alkali aluminosilicate glasses free of boron but exhibiting good stability against copper and silver reduction, resistance to opalization, reduced temperature melting characteristics, and good photochromic properties after heat treatment are described. The use of P.sub.2 O.sub.5 and Li.sub.2 O in combination with fluorine in these compositions facilitates the manufacture of strongly photochromic glasses at reduced halide concentrations.

REFERENCES:
patent: 3653863 (1972-04-01), Aranjo et al.
patent: 3656923 (1972-04-01), Garfinkel et al.

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