Liquid crystalline compound and liquid crystal composition

Details Liquid crystalline compound and liquid crystal composition Liquid crystalline compound and liquid crystal composition

1995-03-24

1996-07-09

Wu, Shean C.

Compositions

Liquid crystal compositions

25229961, 25229963, 25229964, 25229965, 25229966, 25229967, 359103, 570127, C09K 1952, G02F 113, C07C 2513

Patent

active

055341870

ABSTRACT:
A liquid crystalline compound expressed by the formula ##STR1## wherein R.sub.1 represents an alkyl group of 1 to 12 carbon atoms, and one or two not adjacent CH.sub.2 group excluding the terminal in this group may be replaced by --CO-- group, --OCO-- group, --COO-- group or --CH.dbd.CH group; X and Z each represents H, F or Cl; Y represents perfluoroalkyl group or perfluoroalkyloxy group of 1 to 4 carbon atoms, and one or two F atoms in this group may be replaced by H; one of A, B and C represents cyclohexene ring and the others thereof are chosen from among covalent bond or cyclohexane group and benzene ring and these rings may be substituted by F or Cl; and l, m and n each are 0 or 1, independently of each other, but when m=0, then l=0. It is possible to provide a liquid crystal composition having a large .DELTA.n, a low viscosity and a high voltage-holding ratio, and exhibiting a nematic liquid crystal phase within a broad temperature range and having a very high .DELTA..epsilon. and a low driving voltage, and preferably used for TFT. Further it is possible to provide a novel liquid crystalline compound preferred as a component for the liquid crystal composition.

REFERENCES:
patent: 4505837 (1985-03-01), Romer et al.
patent: 5209868 (1993-05-01), Reiffenrath et al.
patent: 5324449 (1994-06-01), Kurmeier et al.
patent: 5342546 (1994-08-01), Sato et al.
patent: 5389295 (1995-02-01), Wachtler et al.

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