Tolan compound and liquid crystal composition containing the sam

Details Tolan compound and liquid crystal composition containing the sam Tolan compound and liquid crystal composition containing the sam

1996-04-04

1997-08-12

Wu, Shean C.

Compositions

Liquid crystal compositions

25229963, 25229966, 25229967, 349182, C09K 1952, C09K 1930, G02F 113

Patent

active

056561989

ABSTRACT:
A novel tolan compound of the formula (I): ##STR1## wherein A is a substituted or unsubstituted cyclohexyl or phenyl group; B is --CO--O-- or --O--CO--; X is a hydrogen atom, a halogen atom, a cyano group, a C.sub.1 -C.sub.10 alkyl group, or a C.sub.1 -C.sub.10 alkoxy group; Y is a hydrogen atom or a halogen atom; and m and n are an integer of 0 or 1, provided that m+n=0 or 1. The tolan compound can raise the N-I point and increase the double refractive index (.DELTA.n) of liquid crystal compositions. The liquid crystal composition containing this tolan compound has excellent characteristics as a liquid crystal material, and the liquid crystal display device using this liquid crystal composition has a wide temperature range and a wide visible angle and can be operated at a low driving voltage.

REFERENCES:
Tinh et al., "Synthesis and Mesomorphic properties of the Homologous Series of 4-Alkyl or Alkory-4'-Bromo or Cyanotolanes", Mol. Cryst. Liq. Cryst., 1980, vol. 62, pp. 125-140.

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