A liquid crystal compound having a relatively low viscosity, a superior compatibility with other liquid crystalline compounds and suitable for preparing a liquid crystal device having a high response rate, and a superior liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 is H, F, Cl, CN or 1-20C alkyl or alkenyl in which alkenyl one --CH.sub.2 -- group or two not adjacent --CH.sub.2 -- groups may be replaced by --O-- and in which alkenyl the position and number of the double bond may be optionally chosen; A.sup.1, A.sup.2 and A.sup.3 are ##STR2## the H atom(s) of which ##STR3## may be replaced by F, Cl or methyl; B.sup.1 and B.sup.2 are --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 -- or single bond; n is 0 or 1; and m is 0 to 20.
Novel liquid crystal compounds which are useful as a component constituting liquid crystal compositions and particularly capable of broadening the liquid crystal temperature range of the compositions due to high clearing point of the compounds, and liquid crystal compositions comprising the same, are provided, which compounds are 4-(trans-4'-alkyloxymethylcyclohexyl)benzoic acid esters having the general formula ##STR1## wherein X represents ##STR2## each represent an alkyl group of 1 to 10 carbon atoms.
A liquid crystalline compound having a small .DELTA.n value; suitable for preparing a liquid crystal display element having a broad viewing angle; having a large positive .DELTA..epsilon. value; and suitable for preparing a liquid crystal composition having a low driving voltage for liquid crystal display devices, and a liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein n represents an integer of 0 to 20.
Novel liquid crystal compounds which are useful as a component constituting liquid crystal compositions and particularly capable of broadening the liquid crystal temperature range of the compositions due to high clearing point of the compounds, and liquid crystal compositions comprising the same, are provided, which compounds are 4-(trans-4'-alkyloxymethylcyc- lohexyl)benzoic acid esters having the general formula
represent an alkyl group of 1 to 10 carbon atoms.
A liquid crystal composition for twist nematic mode
申请人:CHISSO CORPORATION
公开号:EP0318003A2
公开(公告)日:1989-05-31
A liquid crystal composition for twist nematic mode having improved reduction in the threshold voltage and the temperature dependency of threshold voltage in the liquid crystal display element using the composition, and a liquid crystal display element are provided, which composition comprises a compound of the formula
wherein R₁ is 1-8C alkyl, R₂ is F or CN and n is 1 or 2; or comprises the compound of the formula (I) as a first component and at least one member as a second component selected from compounds of the following formulas (II), (III) and (IV);
wherein R₃ is 1-8C alkyl and R₄ is H or F,
wherein R₅ is 1-8C alkyl, R₆ is 1-8C alkoxy or F, m is 1 or 2 and X is single bond or -COO-, and
wherein R₇ is 1-8C alkyl, R₈ is 1-8C alkyl or alkoxy, F or CN and