申请人:Chisso Corporation
公开号:US05382379A1
公开(公告)日:1995-01-17
A novel liquid crystal material having an alkenyl group at the end of the molecule, and having a low viscosity is provided. When the compound is added to a display element it is able to reduce the threshold voltage of the resulting display element. The compound is expressed by the formula (I), ##STR1## 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.gtoreq.1, Z is --CH.sub.2 CH.sub.2 -- 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 are chemically stable; hence it is possible to prepare a composition having a superior multiplex characteristic and capable of effecting a low voltage drive.
本发明提供了一种具有分子末端烯基基团且粘度低的新型液晶材料。当该化合物添加到显示元件中时,能够降低所得到的显示元件的阈值电压。该化合物由式(I)表示,其中X为F原子,三氟甲基基团,三氟甲氧基团或二氟甲氧基团,--A--为1,4-环己基或1,4-苯基,--B--为1,4-环己基,l为0、1或2,m为0、1或2,l+m≥1,Z为--CH2CH2--或单键,n为0到4的整数,R为H原子或1-7C的线性或支链烷基,当R为烷基时,双键具有反式构型。本发明的化合物适用于STN显示元件的液晶材料,并且具有化学稳定性;因此,可以制备具有优异的多重复特性和能够实现低电压驱动的组合物。