Liquid crystalline compound having alkynyl group, and liquid cry

Details Liquid crystalline compound having alkynyl group, and liquid cry Liquid crystalline compound having alkynyl group, and liquid cry

1997-10-10

1999-03-09

Wu, Shean C.

Compositions

Liquid crystal compositions

25229961, 25229963, 25229966, 25229967, 585534, C09K 1952, C09K 1934, C09K 1930, C07C 1554

Patent

active

058795855

ABSTRACT:
A liquid crystalline compound having a remarkably high .DELTA.n and good miscibility with other liquid crystalline compounds, and expressed by the general formula (1) ##STR1## wherein R.sub.1 represents, for example, a halogen atom, cyano group, or an alkyl or alkenyl group of 1 to 15 carbon atoms in which alkyl or alkenyl group hydrogen atom may be replaced, for example, by fluorine atom, and one or not-adjacent two or more methylene groups may be replaced by oxygen atom, --CH.dbd.CH-- or --C.tbd.C--; R.sub.2 represents an alkyl group of 1 to 10 carbon atoms or hydrogen atom; rings A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent, for example, 1,4-cyclohexylene or 1,4-phenylene in which hydrogen atom may be replaced by a halogen atom or cyano group; Z.sub.1, Z.sub.2, and Z.sub.3 independently represent, for example, a covalent bond or --CH.sub.2 CH.sub.2 --; s and t are 0 or 1; u is an integer of 1 to 5; and each of the elements in the general formula may be its isotope. A liquid crystal composition and a liquid crystal display device using the compound are also disclosed.

REFERENCES:
WPIDS 93-216716, 1993.
WPIDS 95-093876, 1995.
Buchecker et al, "Synthesis, Physical Properties and Structural Relationships of New, End-Chain Substituted Nematic Liquid Crystals", Mol. Cryst. Liq. Cryst., 1987, vol. 149, pp. 359-373.
Petrzilka, "Polar Acetylenic Liquid Crystals with Broad Mesomorphic Ranges. The Positional Influence of Different C,C-Elements on the Transition Temperatures", Mol. Cryst. Liq. Cryst., 1984, vol. 111, pp. 329-346.

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