Diaryl-2h-napthopyrans
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United States of America Patent
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-
Sep 14, 1999
Grant Date -
N/A
app pub date -
Jul 30, 1997
filing date -
Jul 11, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The description concerns a photochromicsubstance, with a diaryl-2H-naphthopyrane having a link in the form Y--Ar, Z--Ar, Y--Ar--Y, Y--Ar--Y', Y--Ar--Z, Z--Ar--Z or Z--Ar--Z', in which Y, Y', Z and Z' are pyranes. The photochromic substance is also distinguished in that it has an aryl substituent which reduces the migration of the molecules in plastics.
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