Photochromic diaryl-3H-naphthopyrane
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United States of America Patent
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Nov 23, 1999
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N/A
app pub date -
Feb 5, 1998
filing date -
Oct 28, 1995
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Expired
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Abstract
Disclosed is a photochromic compound having a diaryl-3H-napthopyran structure, which has at the 8-position a nitrogen atom-linked hetercyclus, in which the heterocylcus can also have a HALS compound as a substituent or the heterocyclus itself can be formed as a HALS compound. Furthermore a photochromic compound is described having a diaryl-3H-naphtopyran structure which has at the 8-position an N-atom linked and an alkyl-bridge linked HALS compound.
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