申请人:Canon Kabushiki Kaisha
公开号:US05217645A1
公开(公告)日:1993-06-08
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a linear or branched alkyl group having 2-16 carbon atoms capable of including one or non-neighboring two methylene groups which can be replaced with --O--, --S--, --CO--, --COO-- or --OCO-- and capable of including a hydrogen atom which can be replaced with a fluorine atom; A denotes --A.sub.1 -- or --A.sub.1 --A.sub.2 --; B.sub.2 denotes --B.sub.3 -- or --B.sub.3 --B.sub.4 --; A.sub.1, A.sub.2, B.sub.1, B.sub.3 and B.sub.4 independently denote ##STR2## wherein Y.sub.1 and Y.sub.2 independently denote a hydrogen atom, F, Cl, Br, --CH.sub.3, --CN or --CF.sub.3, with the proviso that B.sub.1 can be a single bond; Z.sub.1 and Z.sub.2 independently denote a single bond, --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --; Z.sub.3 denotes --O--, --CO--, --COO-- or --OCO--; R.sub.2, R.sub.3 and R.sub.4 independently denote a linear or branched alkyl group having 1--16 carbon atoms capable of including one or two methylene groups, other than those directly connected to Si, which can be replaced with --O--, --COO-- or --OCO-- with the proviso that --O-- cannot directly be connected to --O--; 1 and m independently denote 0 or 1 with the proviso that 1+m.noteq.0; n is an integer of 1-12; and X and Q independently denote CH or N with the proviso that X and Q cannot be N simultaneously. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.
以下是用式子(I)表示的一种介向化合物:##STR1## 其中 R.sub.1 代表具有2-16个碳原子的线性或支链烷基,能够包括一个或非相邻的两个甲基烷基,可以用--O--,--S--,--CO--,--COO--或--OCO--替换,并且包括一个氢原子,可以用氟原子替换;A代表--A.sub.1--或--A.sub.1--A.sub.2--;B.sub.2代表--B.sub.3--或--B.sub.3--B.sub.4--;A.sub.1,A.sub.2,B.sub.1,B.sub.3和B.sub.4独立地表示##STR2## 其中Y.sub.1和Y.sub.2独立地表示氢原子,F,Cl,Br,--CH.sub.3,--CN或--CF.sub.3,但B.sub.1可以是单键;Z.sub.1和Z.sub.2独立地表示单键,--COO--,--OCO--,--CH.sub.2 O--或--OCH.sub.2--;Z.sub.3表示--O--,--CO--,--COO--或--OCO--;R.sub.2,R.sub.3和R.sub.4独立地表示具有1-16个碳原子的线性或支链烷基,能够包括一个或两个甲基烷基,除了直接连接到Si的甲基烷基,可以用--O--,--COO--或--OCO--替换,但--O--不能直接连接到--O--;1和m独立地表示0或1,但1+m≠0;n是1-12的整数;并且X和Q独立地表示CH或N,但X和Q不能同时为N。该介向化合物对于提供一种具有改进的低温操作特性和降低的温度依赖性响应速度的铁电液晶组成物是有效的。