Indolino-spiroquinoxalino oxazine photochromatic compounds, methods for their preparation, photochromic compositions and articles containing such compounds
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United States of America Patent
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Aug 18, 1992
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N/A
app pub date -
Jun 5, 1990
filing date -
Jun 5, 1989
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Expired
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Abstract
The new photochromic compounds of the invention have the formula of a indolino-spiro-oxazine comprising an indolinic part and an oxazine part wherein the oxanine part comprises an unsaturated 6-atoms bi-aza heterocycle of the pyrimidine type included in a nucleus of the quinazoline part. Preferred photochromic compounds are those showing the following developed formula (II) wherein R.sub.1 is a methyl or isopropyl group R.sub.2 and R.sub.3 are methyl groups R.sub.4 is H or --OCH.sub.3 ##STR1##
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