Photochromic h-annellated benzo[f]chromene compounds
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United States of America Patent
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Jun 9, 2009
Grant Date -
Oct 25, 2007
app pub date -
Apr 20, 2007
filing date -
Oct 21, 2004
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Abstract
Photochromic h-annellated benzo[f]chromene compounds, especially photochromic compounds derived from benzo[f]chromenes, which compounds have particular long wavelength absorption maxima in their closed form and exhibit good performance in the open, colored form, so that good compatibility is achieved with indenonaphthopyrans which are diffused in phototropic glasses used in phototropic glass applications, and the use of such photochromic h-annellated benzo[f]chromene compounds in photochromic synthetic resin articles, particularly ophthalmic lenses.
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