Alkali metal aluminoborosilicate photochromic glasses

Details Alkali metal aluminoborosilicate photochromic glasses Alkali metal aluminoborosilicate photochromic glasses

1982-03-01

1983-06-28

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 56, C03C 326, C03C 308

Patent

active

043906354

ABSTRACT:
This invention is directed to the production of transparent photochromic glasses containing silver halide crystals sensitized with copper having base compositions within the alkali metal aluminoborosilicate system wherein at least 0.025% As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 is present in the composition to insure that more than 50% of the copper is present in the Cu.sup.+ state. Where an oxidizing agent is added to the composition, the amount of As.sub.2 O.sub.3 and/or Sb.sub.2 O.sub.3 will be increased to reduce that agent plus insure that more than 50% of the copper is present in the Cu.sup.+ state.

REFERENCES:
patent: 3208860 (1965-09-01), Armistead
patent: 3252374 (1966-05-01), Stookey
patent: 3306833 (1967-02-01), O'Leary
patent: 4001019 (1977-01-01), Yamashita et al.
patent: 4190451 (1980-02-01), Hares et al.
patent: 4284686 (1981-08-01), Wedding

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