Photochromatic composition endowed with light fatigue resistance

Details Photochromatic composition endowed with light fatigue resistance Photochromatic composition endowed with light fatigue resistance

1992-03-19

1993-07-06

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Displaying color change

252589, 524 96, G02B 523, F21V 904, C08J 535

Patent

active

052251136

ABSTRACT:
A photochromatic composition, endowed with a high light fatigue resistance contains a photochromatic compound belonging to the class of spirooxazines and an U.V.-stabilizer consisting of a sterically hindered amine to be defined by means of formula (I): ##STR1## wherein: R is either hydrogen or a methyl group,

REFERENCES:
patent: 4177186 (1979-12-01), Rody et al.
patent: 4720356 (1988-01-01), Chu
patent: 4946880 (1990-08-01), Costanzi et al.
patent: 4968454 (1990-11-01), Crano et al.

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