Photochromic glasses which darken to a brown hue

Details Photochromic glasses which darken to a brown hue Photochromic glasses which darken to a brown hue

1980-01-21

1981-02-17

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

65 30R, 106 54, 106DIG6, C03C 304, C03C 326

Patent

active

042512786

ABSTRACT:
The present invention is primarily directed to transparent photochromic glasses which are essentially colorless in the undarkened state but which exhibit a warm brown coloration in the darkened state. Such glasses utilize silver halide crystals to impart photochromic behavior thereto and contain about 1-10 ppm palladium and/or gold. The instant invention is secondarily directed to silver halide crystal-containing photochromic glasses having in excess of 10 ppm palladium and/or gold which exhibit a brownish tint in the undarkened state and a deeper brown coloration in the darkened state. Through differential heat treatment thereof, the latter glasses can be made to exhibit a gradient optical density brownish tint in the undarkened state and also demonstrate a gradient photochromic darkening behavior to a deeper brownish coloration.

REFERENCES:
patent: 3902909 (1975-09-01), Gliemeroth
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4043781 (1977-08-01), DeMunn et al.
patent: 4072490 (1978-02-01), Illig
patent: 4134747 (1979-01-01), Pierson et al.

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