Spiro-indoline oxazine compounds with photochromatic and photosensitizing characteristics and the process for their preparation
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United States of America Patent
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Feb 16, 1993
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app pub date -
Feb 27, 1992
filing date -
Dec 12, 1989
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Abstract
New compounds of the spiro-indoline-oxazine class possessing photochromatic and photosensitizing charecteristics are definable by the general formula (I): ##STR1## where the substituents R, R.sup.1 -R.sup.7 and A are as defined in the description. The process for preparing the compounds (I) is described, as is their use as photochromic agents able to confer photochromatic characteristics on the articles in which they are incorporated, and as photosensitizing agents.
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