Compositions – Light transmission modifying compositions – Displaying color change
Patent
1987-06-04
1988-01-19
Henderson, Christopher
Compositions
Light transmission modifying compositions
Displaying color change
8506, 350438, 524 89, 524 90, G02B 523, C08K 535
Patent
active
047203560
ABSTRACT:
An organic photochromic composition comprising spiro [indoline-2,3'-[3H]-naphth [2,1-b] [1,4] oxazine] dye (spirooxazine dye) and unconventional ultraviolet stabilizers. The ultraviolet stabilizers improve the light fatigue resistance of the spirooxazine (S.O.) dye and will not hinder the photocolorability of the photochromic composition. The unconventional ultraviolet stabilizers belong to the class of hindered amine light stabilizers (HALS) and excited state quenchers.
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Stretanski, J. A. "Ultraviolet Stabilizers", Modern Plastics Encyclopedia, pp. 179-180, (1984-1985).
American Optical Corporation
Henderson Christopher
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