| 摘要 |
<p>A novel liquid crystal material having an alkenyl group at the end of the molecule, and having a low viscosity, and when the compound is added, being able to reduce the threshold voltage of the resulting display element, is provided, the compound being expressed by the formula (I), <CHEM> wherein X is a F atom, a trifluoromethyl group, a trifluoromethoxy group or a difluoromethoxy group, -A- is 1,4-cyclohexylene or 1,4-phenylene, -B- is 1,4-cyclohexylene, l is 0, 1 or 2, m is 0, 1 or 2, l+m>/=1, Z is -CH2CH2- or single bond, n is an integer of 0 to 4, R is a H atom or a linear or branched alkyl group of 1-7C, and when R is an alkyl group, the double bond has a trans-configuration. The compounds of the present invention are suitable as liquid crystal material for STN display element, and further is chemically stable; hence it is possible to prepare a composition having a superior multiplex characteristic and capable of effecting a low voltage drive.</p> |
