Compositions – Liquid crystal compositions – Containing pleochroic dye
Patent
1990-10-29
1991-08-06
Stoll, Robert L.
Compositions
Liquid crystal compositions
Containing pleochroic dye
430 70, 430 57, 430 75, 430 78, 359 96, G03G 506, G02F 113
Patent
active
050375750
ABSTRACT:
A squarilium compound represented by the following formula (I) and a liquid crystal composition containing the same are disclosed: ##STR1## wherein X and Y each represents ##STR2## wherein R.sup.1 represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group; R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group or a substituted or unsubstituted alkoxy group; R.sup.5 represents a hydrogen atom, an alkyl group, an aralkyl group or an aryl group; ring A represents a cyclic alkylene; ring B represents a substituted or unsubstituted aromatic ring; and ring C represents a heterocyclic ring containing one or two of a nitrogen atom, an oxygen atom and a sulfur atom; with proviso that X and Y are not the same when either one of them represents ##STR3## and a liquid crystal composition containing the squarilium compound of the formula (I). The squarilium compound (I) are soluble in a wide variety of solvents and resistant to light, and their maximum absorption wavelengths in these solvents are in the ranges of from 700 to 900 nm.
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Iwanami Junko
Miura Konoe
Ozawa Tetsuo
Mitsubishi Chemical Industries Ltd.
Stoll Robert L.
Sweet Greg M.
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