Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles
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United States of America Patent
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Jun 12, 2007
Grant Date -
May 5, 2005
app pub date -
Sep 21, 2004
filing date -
Mar 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula I ##STR00001## in which the groups R.sub.1 to R.sub.7 and B' have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran derivatives have particularly long-waved absorption maxima in the open form, and when used in photochromic eyeglass lenses, produce essentially blue color tones which have a high darkening capacity.
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