Benzopyrans annelated in C7-C8 with an aromatic heterocycle and compositions and (CO)polymer matrices containing them
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United States of America Patent
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Jul 30, 2002
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N/A
app pub date -
Jun 8, 2000
filing date -
Jun 10, 1999
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Expired
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Abstract
The invention relates to novel benzopyran-type compounds having an aromatic heterocycle annelated in position 7,8 and a carbocycle annelated in position 5,6. These compounds have the 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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