Photochromic compounds
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United States of America Patent
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Jul 8, 1997
Issued Date -
N/A
app pub date -
Dec 28, 1995
filing date -
Jun 28, 1993
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Expired
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Abstract
A photochromic compound, in particular, for tinting optical elements made of a plastic material has reduced mobility in plastic material. The photochromic compound is a photochromic 2H-pyran and is distinguished by the aromatic residues being chemically rigidly attached in the 2-position to a spiropyran.
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