NOVEL AROMATIC SUBSTITUTED NAPHTHOPYRANS
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United States of America Patent
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app pub date -
Dec 15, 2000
filing date -
Sep 19, 1997
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Abstract
Described are photochromic 2H-naphtho[1,2-] pyrans characterized by having an aromatic substituent in the 5 position. The aromatic group at 5-position of the naphthopyran is a substituted or unsubstituted aryl group or other substituted or unsubstituted aromatic group. These compounds may be represented by the following graphic formula: 1 Also described are polymeric organic host materials that contain or that are coated with such compounds.
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