Photochromic benzopyrans
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United States of America Patent
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Feb 22, 2011
Grant Date -
Sep 30, 2010
app pub date -
Nov 25, 2008
filing date -
Nov 26, 2007
priority date (Note) -
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Abstract
The present invention relates to photochromic benzopyrans and to the use thereof in plastics of all kinds, especially for ophthalmic purposes. The inventive compounds are photochromic benzopyran compounds in which a polycyclic aromatic is joined to the 5 and 6 positions of a benzopyran, where the bond in the 6 position is direct and the bond in the 5 position is via a mono- or diatomic bridge.
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