Naphthopyrans annelated in C5-C6, their preparation and compositions and (CO)polymer matrices containing them
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United States of America Patent
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Feb 19, 2008
Grant Date -
Dec 26, 2002
app pub date -
Jul 16, 2002
filing date -
Sep 11, 1998
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Abstract
The present invention relates to novel compounds of the naphthopyran type which have an annelated carbocycle in position 5,6. These compounds are of formula (I) given below: ##STR00001## in which A is an alicyclic ring which is optionally annelated with an aromatic ring and in which two adjacent R.sub.3 can together form at least one ring, for example a benzo group. These compounds (I) possess interesting photochromic properties. The invention also relates to the method of preparing these compounds (I), as well as their applications as photochromes and compositions and (co)polymer matrices comprising them.
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