Liquid crystals having pleochroic dyes
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United States of America Patent
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Dec 14, 1982
Grant Date -
N/A
app pub date -
Feb 4, 1981
filing date -
Feb 26, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Anthraquinone dyes of the general formula: ##STR1## wherein R.sup.1, R.sup.3, R.sup.4 and R.sup.6 are selected from the group consisting of H, OH, OCH.sub.3, NO.sub.2, NH.sub.2 and NHCH.sub.3 ; R.sup.2 and R.sup.5 are selected from the group consisting of: ##STR2## wherein R.sup.7 is selected from the group consisting of alkyl-, aryl-, amino-, alkylamino-, dialkylamino-, arylamino-, alkyloxy-, and aryloxy radicals, along with their syntheses routes are disclosed. The dyes are particularly useful in liquid crystal displays which function with a 'guest host' effect or in other electrooptical display devices having a medium therein switchable between different ordering states.
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