Naphthopyran derivatives, compositions and (co) polymer matrices containing same
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United States of America Patent
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Jun 4, 2002
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Jul 20, 1999
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Mar 21, 1997
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Abstract
For subject, the present invention has novel naphthopyran derivatives of formula: ##STR1## optionally substituted in position(s) 2, 3, 4, 6, 7, 8, 9 or/and 10; the substituent Z in position 5 being of formula --C(R1)(R2)(OR3). The invention also relates to compositions and (co)polymer matrices containing such derivatives. Said derivatives have interesting photochromic properties.
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