Photochromic composition resistant to fatigue
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United States of America Patent
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Apr 3, 1984
Grant Date -
N/A
app pub date -
Mar 22, 1982
filing date -
Mar 22, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The organic photochromic composition of this invention comprises spiro [indoline-2,3'-[3H]-naphth [2,1-b] [1,4] oxazine] (SO) dye and an unconventional ultraviolet stabilizer. The ultraviolet stabilizer improves the light fatigue resistance of the SO dye and will not hinder the photocolorability of the photochromic composition.
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