Photochromic naphthopyran compounds
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United States of America Patent
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Dec 28, 1993
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N/A
app pub date -
Sep 30, 1992
filing date -
Sep 30, 1992
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Expired
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Abstract
Described are novel reversible photochromic naphthopyran compounds, examples of which are 3-aryl-3-arylalkenyl naphthopyrans. 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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