Photochromic articles
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United States of America Patent
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Nov 24, 1998
Issued Date -
N/A
app pub date -
Jul 17, 1997
filing date -
Jun 7, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A photochromic article that includes a host material and a photochromic amount of a naphthopyran compound, the naphthopyran compound represented by the formula: ##STR1## wherein R.sub.1 ', R.sub.2 ', R.sub.3 ', R.sub.4 ', R.sub.5 ', R.sub.6 ', R.sub.7 ', R.sub.8 ', R.sub.9 ', R.sub.10 ', R.sub.1 ', R.sub.2 ', R.sub.3 ', R.sub.4 ', R.sub.5 ', R.sub.6 ', R.sub.7 ', R.sub.8 ', R.sub.9 ', and R.sub.10 ' are each selected from the following group: a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.
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