申请人:Chisso Corporation
公开号:US05702641A1
公开(公告)日:1997-12-30
A liquid crystalline compound exhibiting a large .DELTA..epsilon. value, an electrical and chemical stability and a superior compatibility with existing liquid crystalline compounds, a liquid crystal composition containing the same, and a liquid crystal display element constructed by using the composition are provided, which liquid crystalline compound is expressed by the formula (I), F--(CH.sub.2)n-E--(CH.sub.2 CH.sub.2).sub.k --G--(CH.sub.2 CH.sub.2).sub.l --L--(CH.sub.2 CH.sub.2).sub.m --Z--Q--Y (I) wherein n is an integer of 1 to 10; k, l and m each independently are an integer of 0 to 2; ring E is 1,4-cyclohexylene group or 1,4-phenylene group, wherein one or more H atoms on each six-membered ring may be replaced by F atom(s); G and L each independently is a covalent bond or 1,4-cyclohexylene group or 1,4-phenylene group, wherein one or more H atoms on each six-membered ring may be replaced by F atom(s); Q is covalent bond or --O--; Y is a fluoroalkyl group of 1 to 3C or F atom; but in the case where ring E is 1,4-cyclohexylene group and at least one of G and L is covalent bond, k+l+m.noteq.0, and in the case where Q is --O--, Y is not F atom.
本发明提供了一种液晶化合物,该化合物表现出较大的.DELTA..epsilon.值,电学和化学稳定性以及与现有液晶化合物的优异兼容性,以及包含该化合物的液晶组合物和利用该组合物构造的液晶显示元件。该液晶化合物由式(I)表示,F--(CH.sub.2)n-E--(CH.sub.2 CH.sub.2).sub.k--G--(CH.sub.2 CH.sub.2).sub.l--L--(CH.sub.2 CH.sub.2).sub.m--Z--Q--Y (I),其中n为1至10的整数;k,l和m各自独立地为0至2的整数;环E是1,4-环己基或1,4-苯基,其中每个六元环上的一个或多个H原子可以被F原子取代;G和L各自独立地为共价键或1,4-环己基或1,4-苯基,其中每个六元环上的一个或多个H原子可以被F原子取代;Q为共价键或--O--;Y为1至3C的氟烷基或F原子;但在环E为1,4-环己基且至少一个G和L为共价键的情况下,k+l+m.noteq.0,在Q为--O--的情况下,Y不是F原子。