Tercyclohexane, liquid-crystalline compound and liquid crystal c

Details Tercyclohexane, liquid-crystalline compound and liquid crystal c Tercyclohexane, liquid-crystalline compound and liquid crystal c

1996-06-14

2000-02-29

Kelly, C. H.

Compositions

Liquid crystal compositions

570144, C09K 1930, C07C 2200

Patent

active

060305452

ABSTRACT:
The present invention provides a liquid-crystalline compound which has a reduced viscosity, a wide liquid crystal temperature range (high clearing point), a high chemical stability (extremely high specific resistance, high voltage holding ratio) and a high solubility with other liquid-crystalline compound(s) and preferably has a proper refractive index anisotropy. The present invention also provides a liquid crystal composition having excellent properties. The liquid-crystalline compound is represented by the following general formula (1): wherein R and R' each independently represents a C.sub.1-20 alkyl or halogenated alkyl group or a group obtained by replacing one or more --CH.sub.2 -- groups in the alkyl group by any of --O--, --S--, --CH.dbd.CH-- or --C.tbd.C--, provided that two or more --CH.sub.2 -- groups are not consecutively replaced by either --O-- or --S--; and Z.sub.1 and Z.sub.2 each independently represents a covalent bond or 1,2-ethylene group, provided that when both Z.sub.1 and Z.sub.2 are a covalent bond, R and R' are not straight-chain alkyl groups each having the same chain length.

REFERENCES:
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patent: 4877547 (1989-10-01), Weber et al.
patent: 5030383 (1991-07-01), Scheuble et al.
patent: 5308537 (1994-05-01), Coates et al.

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