Oxygen-containing heterocyclic fused naphthopyrans
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United States of America Patent
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Aug 19, 2003
Grant Date -
May 15, 2003
app pub date -
Sep 20, 2001
filing date -
Sep 20, 2001
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Abstract
Novel naphthopyrans having an oxygen-containing heterocyclic group F annelated on the f, i, j, or k side of the naphthopyran ring. These naphthopyrans may have the formula (I) presented below: ##STR1## These compounds (I) have interesting photochromic properties. Various organic host materials that contain such compounds are described. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations are enabled.
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