Liquid crystal compound having large optical anisotropy value

Details Liquid crystal compound having large optical anisotropy value Liquid crystal compound having large optical anisotropy value

1989-12-15

1992-10-13

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 2522996, 25229966, 585 25, C09K 1952, C09K 1930

Patent

active

051548518

ABSTRACT:
A liquid crystal compound is provided, having a large optical anisotropy .DELTA.n value and yet a low viscosity, and which can be added to a liquid crystal composition, without lowering the NI point of the composition and raising the viscosity thereof, while raising the .DELTA.n value thereof. The liquid crystal compound is a 4-substituted-4'-(1-alkynyl)tolan expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each is 1-8C alkyl and one CH.sub.2 group or two non-adjacent CH.sub.2 groups present therein may be replaced by any one of O, --CO--, --CO--O--, --O--CO-- or --CH.sub.2 .dbd.CH.sub.2 --; --A-- is unsubstituted 1,4-phenylene, 1,4-phenylene having one or two F, Cl or Br atoms or CN groups, 1,4-cyclohexylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl; X is --COO--, --OCO--, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.CH-- or a single bond; n is 0 or 1 and when n is 0, X is a single bond; and Y is H or F.

REFERENCES:
patent: 3925482 (1975-12-01), Jacques
patent: 4528114 (1985-07-01), Petrzilka
patent: 4705905 (1987-11-01), Takatsu et al.

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