Substituted naphthopyrans

Compositions – Light transmission modifying compositions – Displaying color change

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549389, 549362, 549331, 549 60, 549 58, 548454, 546256, 5462804, 5462811, 5462827, 5462774, 5462824, 524110, G02B 523, G02B 2700, C07D31192

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active

055737129

ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.

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