Aryl-mercapto anthraquinone dyestuffs, their preparation and use and dichroic material containing aryl-mercapto anthraquinone dyestuffs
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United States of America Patent
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-
Jun 24, 1986
Grant Date -
N/A
app pub date -
Dec 2, 1983
filing date -
Dec 3, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Anthraquinone dyestuffs of the formula ##STR1## in which R.sub.1 represents alkyl, aralkyl, --CO--X-alkyl, --CO--X-aralkyl, --CO--X-aryl, --O-alkyl, --O-aralkyl, --O-- aryl, --CN, --NO.sub.2, --CF.sub.3, halogen or a heterocyclic radical and R.sub.2 represents H or R.sub.1, X representing O, S, NH or a direct bond and Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 denoting hydrogen, --NH.sub.2, --OH, halogen, --NO.sub.2 or an arylmercapto group and at least one of the substituents Y.sub.1 -Y.sub.4 representing an arylmercapto group, it being also possible for the alkyl, aryl, aralkyl and heterocyclic radicals mentioned for R.sub.1 and Y.sub.1 -Y.sub.4 to be substituted, the preparation and use thereof, and dichroic material containing these anthraquinone dyestuffs.
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