Photochromic chromene compounds
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United States of America Patent
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Apr 6, 1993
Grant Date -
N/A
app pub date -
Jul 23, 1990
filing date -
Jul 23, 1990
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Expired
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Abstract
Described are a series of novel photochromic benzopyran and naphthopyran compounds substituted with (1) a cyclopropyl group and (2) a phenyl, substituted phenyl, or 5-member aromatic heterocyclic group at the 2-position of the benzopyran or naphthopyran ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic or plano lenses that incorporate the novel pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described.
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