Photochromic composition resistant to fatigue
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United States of America Patent
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Jan 19, 1988
Issued Date -
N/A
app pub date -
Jun 4, 1987
filing date -
Mar 22, 1982
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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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