Photochromic materials having extended pi-conjugated systems and compositions and articles including the same
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United States of America Patent
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Mar 5, 2013
Grant Date -
Jun 14, 2012
app pub date -
Feb 21, 2012
filing date -
Apr 8, 2005
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Abstract
The present invention provides a photochromic material which is an indeno-fused naphthopyran of structural formulas I or II, having a pi-conjugation extending group bonded to the 11-position of the indeno-fused naphthopyran, the pi-conjugation extending group having at least one pendent halo-substituted group bonded thereto. The pi-conjugation extending group extends the pi-conjugation system of said indeno-fused naphthopyran. The 13-position of the indeno-fused naphthopyran is substantially free of spiro-substituents. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic material.
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