Dichroic liquid crystal compositions made with asymmetric tris-azo dyes
Abstract
Abstract Novel asymmetric tris-azo dye compositions and a liquid crystal composition containing the asymmetric tris-azo dye compositions are disclosed. The asymmetric dye compositions having asymmetric terminal groups have the general formula: ##STR1## wherein R 1 is one of the three following groups: ##STR2## 5-nitrothiazolyl group, 4-cyanophenyl group, and 4-nitrophenyl; wherein R 2 , R 3 , R 4 and R 5 are selected from the group consisting of hydrogen, alkyl, halogen and alkoxy, and R 6 is selected from the group consisting of N,N-diethylamino-3-methylphenyl; N,N-diethylamino-3-methylphenyl; N,N-diethylamino-3,5-dimethylphenyl; 2-pentylperimidyl; N-ethylamino-1-naphthyl; N,N-dimethylamino-1-naphthyl; and N,N-diethylamino-1-naphthyl. When the asymmetric tris-azo dichroic dyes are used as a guest in a host liquid crystal material, they form a novel liquid crystal composition for use in liquid crystal displays.
Inventors
- 👤 Siegfried Aftergut
- 👤 Herbert S. Cole
Bibliographic Details
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
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