Compositions – Light transmission modifying compositions – Displaying color change
Patent
1997-03-18
1998-03-03
Richter, Johann
Compositions
Light transmission modifying compositions
Displaying color change
524 84, 524 90, 524109, 524110, 544141, 544145, 544150, 544142, 546197, 546198, 5462767, 5462811, 5462827, 548417, 548526, 549 41, 549381, G02B 523, C07D49106, C07D49306, C07D49506
Patent
active
057230722
ABSTRACT:
Described are novel photochromic heterocyclic fused indenonaphthopyran compounds having a substituted or unsubstituted heterocyclic ring fused to the g, h, i, n, o or p side of the indenonaphthopyran. These compounds may be represented by either of the following graphic formulae: ##STR1## Also described are polymeric organic host materials that contain or that are coated with such compounds.
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Mallak Frank P.
PPG Industries Inc.
Richter Johann
Stein Irwin M.
Stockton Laura L.
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