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US 4,676,923 AGranted
Dichroic dyestuffs for liquid crystal and liquid crystal composition
AssigneeKabushiki Kaisha Nippon Kanko Shikiso Kenkyusho
InventorsShigeo Yasui, Masashi Ono, Seiko Kobayashi, Shigeo Senzai, Tatsuo Uchida
Life of this patent
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Abstract
New dichroic dyestuffs for the guest-host type liquid crystal and new liquid crystal compositions containing said dyestuff having an excellent improved dichroism and being prepared by introducing at least one group selected from the group consisting of phenyl, cyclohexyl, phenylcarbonyloxy and phenyloxycarbonyl group into a phenyl, a cyclohexyl or a naphthyl group at its 4-position, which is arranged at the end of a known dichroic dyestuff molecule along the major axis of the molecule.
Claims8
A dichroic dyestuff of the general formula:
- ##STR35## wherein A represents ##STR36## and if A is ##STR37## R is alkyl and R.sub.1 is alkoxy or alkylcarbonyloxy;
- and if A is ##STR38## R is para-alkylbiphenyl and R.sub.1 is para-alkylphenyl or dialkylamino.
Dependencies are inferred from the claim text.