Compositions – Light transmission modifying compositions – Displaying color change
Patent
1999-12-17
2000-11-21
Tucker, Philip
Compositions
Light transmission modifying compositions
Displaying color change
549382, 549275, 549 58, 549 60, 549337, 549362, 544124, 544148, 544150, 546167, 546194, 546196, 546197, 5462807, 5462811, 5462841, 548454, 548518, 548525, 548526, 351163, G02B 523, C07D31178
Patent
active
061498416
ABSTRACT:
Described are novel photochromic benzopyrano-fused naphthopyran compounds, examples of which are naphthopyran compounds having a substituted or unsubstituted benzopyran group fused to one side of the naphtho portion of the naphthopyran and having certain substituents at the position ortho to the oxygen atom of the naphthopyran ring. These compounds may be represented by the following: ##STR1## Also described are polymeric organic host materials that contain or that are coated with such compounds or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, benzopyrans, and spiro(indoline)type compounds.
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Mallak Frank P.
PPG Industries Ohio Inc.
Stein Irwin M.
Tucker Philip
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