Naphthopyrans and phenanthropyrans annelated in C5-C6 with a bicycle group and compositions and (co) polymer matrices containing them
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United States of America Patent
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Apr 3, 2001
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app pub date -
Feb 16, 2000
filing date -
Feb 17, 1999
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Abstract
The invention relates to novel naphthopyran- and phenanthropyran-type compounds having a carbobicycle annelated in 5,6-position. These compounds have formula (I) given below: ##STR1## These compounds (I) have interesting photochromic properties. The invention also relates to their preparation, to their applications as photochromes, as well as to the compositions and (co)polymer matrices containing them.
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