Photochromic spironaphthopyran compounds

Details Photochromic spironaphthopyran compounds Photochromic spironaphthopyran compounds

1995-05-31

1998-01-06

Owens, Amelia A.

Compositions

Light transmission modifying compositions

Ultraviolet

252586, 544150, 544375, 5462827, 549389, 524110, 351163, C07D31192, C07D41300

Patent

active

057051020

ABSTRACT:
A naphthopyran compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are each selected from the group consisting essentially of hydrogen, a stable organic radical, a heterocyclic group, a halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound and wherein A is a substituted divalent aromatic radical that includes substituents selected from the group consisting essentially of hydrogen and the stable organic radical.

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patent: 5244602 (1993-09-01), Van Gemert
patent: 5274132 (1993-12-01), Van Gemert
patent: 5395567 (1995-03-01), Van Gemert et al.
patent: 5532361 (1996-07-01), Allegrini et al.

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