申请人:Chisso Corporation
公开号:US05653911A1
公开(公告)日:1997-08-05
A novel liquid crystalline compound having a high elastic constant ratio (K.sub.33 /K.sub.11) and an improved solubility thereof in other liquid crystal materials, at low temperatures, and a liquid crystal composition containing the same are provided. The liquid crystalline compound is expressed by the formula (1): ##STR1## wherein Q represents CF.sub.3, CF.sub.2 H or CFH.sub.2 ; A.sub.1, A.sub.2 and A.sub.3 each independently represent trans-1,4-cyclohexylene group, 1,4-phenylene group, wherein one or more hydrogen atoms on its six-membered ring may be replaced by F, Cl or CN, pyridine-2,5-diyl group or 1,3-pyrimidine-2,5-diyl; ring B represents 1,4-phenylene group or trans-1,4-cyclohexylene group; Z.sub.1, Z.sub.2 and Z.sub.3 each independently represent covalent bond, --C.dbd.C--, --C.tbd.C--, --OCO--, --COO--, --CH.sub.2 O--, --OCH.sub.2 --, --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.4 --; l and m each independently represent an integer of 0 to 5; o and p each independently represent 0 or 1; L.sub.1 and L.sub.2 each independently represent H, F or Cl; L.sub.3 represents halogen atom, CN, CF.sub.3, CF.sub.2 H, CFH.sub.2, OCF.sub.3, OCF.sub.2 H, H or an alkyl group of 1 to 10 carbon atoms or an alkenyl group of 2 to 10 carbon atoms wherein optional methylene groups (--CH.sub.2 --) in the alkyl group or the alkenyl group each independently may be replaced by --O--, --S--, --CO--, --OCO-- or --COO--, but two or more methylene groups should not be continuedly replaced.
提供了一种具有高弹性常数比(K.sub.33/K.sub.11)和改善其在低温下在其他液晶材料中的溶解度的新型液晶化合物和含有该化合物的液晶组合物。该液晶化合物由式(1)表示:##STR1## 其中Q代表CF.sub.3、CF.sub.2 H或CFH.sub.2;A.sub.1、A.sub.2和A.sub.3各自独立地表示反-1,4-环己基、1,4-苯基,其中其六元环上的一个或多个氢原子可被F、Cl或CN取代,吡啶-2,5-二基基团或1,3-嘧啶-2,5-二基;环B表示1,4-苯基或反-1,4-环己基;Z.sub.1、Z.sub.2和Z.sub.3各自独立地表示共价键、--C.dbd.C--、--C.tbd.C--、--OCO--、--COO--、--CH.sub.2 O--、--OCH.sub.2--、--(CH.sub.2).sub.2--或--(CH.sub.2).sub.4--;l和m各自独立地表示0到5的整数;o和p各自独立地表示0或1;L.sub.1和L.sub.2各自独立地表示H、F或Cl;L.sub.3表示卤素原子、CN、CF.sub.3、CF.sub.2 H、CFH.sub.2、OCF.sub.3、OCF.sub.2 H、H或1到10个碳原子的烷基或2到10个碳原子的烯基,其中烷基或烯基中的可选亚甲基基(--CH.sub.2--)各自独立地可被--O--、--S--、--CO--、--OCO--或--COO--取代,但不应连续替换两个或更多的亚甲基基。