Polyalkoxylated naphthopyrans
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United States of America Patent
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Oct 5, 1999
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N/A
app pub date -
Sep 11, 1998
filing date -
Sep 11, 1998
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Abstract
Described are novel photochromic polyalkoxylated naphthopyran compounds, examples of which are certain 2H-naphtho?1,2-b!pyrans, 3H-naphtho?2,1-b!pyrans and indeno?2,1-f!naphtho?1,2-b!pyrans, each having at least one polyalkoxylated substituent of from 2 to 50 alkoxy units per substituent. Specific substituents may also be present on the naphtho, indeno and pyrano portions of the compounds. These compounds may be represented by the following graphic formulae: ##STR1##
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