Photochromic benzopyrano-fused naphthopyrans

Details Photochromic benzopyrano-fused naphthopyrans Photochromic benzopyrano-fused naphthopyrans

1998-07-10

2000-02-08

Tucker, Philip

Compositions

Light transmission modifying compositions

Displaying color change

549382, 549 58, 549 60, 549337, 549362, 544124, 544148, 544150, 546167, 546194, 546196, 546197, 5462807, 5462811, 5462841, 548454, 548518, 548525, 548526, G02B 523, C07D31178

Patent

active

060224959

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 graphic formulae: ##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, nenzopyrans, and spiro(indoline)type compounds.

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