Photochromatic compounds, process for their preparation and their use in polymeric materials
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United States of America Patent
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Jul 2, 2002
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N/A
app pub date -
Mar 6, 2000
filing date -
Jul 3, 1997
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Expired
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Abstract
##STR1## Photochromic compounds belonging to the group of spiro-isoindolino-oxazines having general formula (I). The above photochromatic compounds having general formula (I) have excellent photochromic characteristics, excellent stress resistance and high dyability characteristics.
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