申请人:Chisso Corporation
公开号:US05720899A1
公开(公告)日:1998-02-24
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)和改善其在其他液晶材料中的溶解度的新型液晶化合物,适用于低温,以及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-
环己烷基,1,4-苯基,其六元环上一个或多个氢原子可被F,Cl或CN替换,
吡啶-2,5-二基基团或1,3-
嘧啶-2,5-二基;环B代表1,4-苯基或反-1,4-
环己烷基;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团(-CH.sub.2-)可以独立地被替换为-O-,-S-,-CO-,-OCO-或-COO-,但不应连续替换两个或更多的亚甲基基团。