申请人:Chisso Corporation
公开号:EP1010687A2
公开(公告)日:2000-06-21
A novel liquid crystalline compound having a large dielectric anisotropy value, a small change in the threshold voltage depending upon temperatures, and an improved solubility in other liquid crystal materials at low temperatures, and a liquid crystal composition containing the compound are provided,
which liquid crystalline compound is expressed by the formula (1)
wherein R represents an alkyl group of 1 to 10 carbon atoms; ℓ represents an integer of 1 to 9; m and n each independently represent 0 or 1; A1, A2 and A3 each independently represent trans-1,4-cyclohexylene group, 1,4-phenylene group or 1,3-dioxane-2,5-diyl group; Z1, Z2 and Z3 each independently represent -COO-, -(CH2)2- or a covalent bond at least one of which represents -COO-; X represents CF3, CF2H, CFH2, OCF3 or OCF2H; Y1 and Y2 each independently represent H or F with the proviso that at least one of Y1 and Y2 is F; provided that when m + n = 1, then Z3 represents -COO-.
本发明提供了一种新型液晶化合物,该化合物具有较大的介电各向异性值,阈值电压随温度的变化较小,低温下在其他液晶材料中的溶解性也有所改善,还提供了一种含有该化合物的液晶组合物、
该液晶化合物由式(1)表示
其中 R 代表 1 至 10 个碳原子的烷基;ℓ 代表 1 至 9 的整数;m 和 n 分别独立地代表 0 或 1;A1、A2 和 A3 分别独立地代表反式-1,4-环己烯基、1,4-亚苯基或 1,3-二氧六环-2,5-二基;Z1、Z2 和 Z3 各自独立地代表-COO-、-(CH2)2- 或至少一个代表-COO-的共价键;X 代表 CF3、CF2H、CFH2、OCF3 或 OCF2H;Y1 和 Y2 各自独立地代表 H 或 F,但 Y1 和 Y2 中至少有一个是 F;当 m + n = 1 时,则 Z3 代表-COO-。