Photochromic naphthopyrans
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United States of America Patent
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Dec 17, 1996
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app pub date -
Nov 28, 1994
filing date -
Feb 24, 1992
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Abstract
Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. Also described are polymeric organic host materials that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain spiro(indoline)type compounds, are also described.
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