Nematic compounds

Details Nematic compounds Nematic compounds

1984-08-06

1987-01-20

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

558415, 558414, 558423, 558411, 2522995, 350350R, 350350S, 560 65, 560 73, 560126, 560 1, 560 8, 568631, 568647, 570129, 570182, C07C 4984, C07C 43225, C07C 3942, C07C 6975, C07C 2513, C07C12152, C07C12156, C09K 1930

Patent

active

046378979

ABSTRACT:
Nematic compounds with a negative DC antisotropy, characterized by the formula I ##STR1## in which m=1 or 2, r is zero or 1 and m+r=1 or 2, and R.sup.1 and R.sup.2 are identical or different and are selected from alkyl and alkoxy groups each having 1-12 carbon atoms in a straight or branched chain, which may be chiral, Z is a bridge member selected from a single bond and the groups of the formulae --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --O--CO-- or --CO--O--, one of the groups X and Y is selected from fluorine, chlorine, bromine and cyano and the other of the groups X and Y is selected from hydrogen, fluorine, chlorine, bromine and cyano, with the proviso that m=r=1 if X and Y are both cyano, are suitable as components for liquid crystal mixtures having an overall negative DC anisotropy, such as are required in particular for electro-optical displays of the type of guest/host displays or homotropic-nematic displays.

REFERENCES:
patent: 4357078 (1982-11-01), Carr et al.
patent: 4368135 (1983-01-01), Osman et al.
patent: 4393258 (1983-07-01), Sato et al.
patent: 4400061 (1983-08-01), Carr et al.
patent: 4400293 (1983-08-01), Romer et al.
patent: 4439015 (1984-02-01), Rich et al.
patent: 4479885 (1984-10-01), Mukoh et al.
patent: 4480117 (1984-10-01), Takatsu et al.
patent: 4512636 (1985-04-01), Andrews et al.
patent: 4514317 (1985-04-01), Tuonl et al.
Osman, M. A., et al., Mol. Cryst. Liq. Cryst., vol. 82 (Letters), pp. 339-344 (1983).

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