Photochromic compounds

Details Photochromic compounds Photochromic compounds

1997-12-01

1998-12-08

Owens, Amelia

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544148, 544378, 546197, C07D31178

Patent

active

058471685

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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