Photochromic polymeric membrane

Details Photochromic polymeric membrane Photochromic polymeric membrane

1988-06-20

1991-05-14

Maples, John S.

Compositions

Light transmission modifying compositions

Displaying color change

430567, 430627, 430569, 430566, 350354, G02B 523, G03C 1005

Patent

active

050154168

ABSTRACT:
A photochromic material adapted for coating light transmissive materials. The photochromic material contains photosensitive silver halide crystals having dimensions in the range of approximately 50 Angstroms to 800 Angstroms. The silver halide crystals are surface doped with copper ions and another sensitizer selected from mild reducing agents or sulfur-bearing ions. The crystals are dispersed in a protective polymer that does not irreversibly bind halogen.

REFERENCES:
patent: 4046586 (1977-09-01), Uhlmann et al.
patent: 4049567 (1977-09-01), Chu et al.
patent: 4076542 (1978-02-01), Deeg et al.
patent: 4110244 (1978-08-01), Hovey
patent: 4431730 (1984-02-01), Urabe et al.
patent: 4550087 (1985-10-01), Kerko et al.

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