Photochromic articles with thermally stable photocolorability

Details Photochromic articles with thermally stable photocolorability Photochromic articles with thermally stable photocolorability

1989-02-24

1991-03-19

Maples, John S.

Compositions

Light transmission modifying compositions

Infrared

544 71, 350354, F21V 904, F21V 906

Patent

active

050008781

ABSTRACT:
Spirooxazine compounds are incorporated into a plastic host comprised of copolymers of poly(vinyl alcohol) and poly(vinyl acetate). This combination results in a photochromic composite which exhibits significantly improved temperature stability relative to the prior art.

REFERENCES:
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4720547 (1988-01-01), Kwak et al.
patent: 4784474 (1988-11-01), Yamamoto et al.

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