Photochromic compositions of improved fatigue resistance
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United States of America Patent
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Feb 21, 1995
Issued Date -
N/A
app pub date -
Jun 9, 1994
filing date -
Sep 25, 1992
priority date (Note) -
Expired
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Abstract
Photochromic optical articles of improved resistance to light fatigue are provided by the use of a combination of hindered amine light stabilizer and asymmetric diaryloxalamide light stabilizer with a mixture of (1) photochromic material having a minima luminous transmission in the range of 560 to 630 nanometers and (2) photochromic material having a minima luminous transmission in the range of 430 to 520 nanometers.
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