申请人:Mitsui Petrochemical Industries, Ltd.
公开号:US05322639A1
公开(公告)日:1994-06-21
The carboxylic acid ester compound of the invention is represented by the following formula [I]: ##STR1## wherein R is an alkyl group of 3-20 carbon atoms; n is 0 or 1; at least one of A.sup.1, A.sup.2 and A.sup.3 is a group having tetralin structure, and the residual groups of A.sup.1, A.sup.2 and A.sup.3 are each independently a group having specific aromatic cyclic structure such as a phenylene group and a biphenyl group; Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --CH.sub.2 CH.sub.2 -- and --CH.sub.2 O--; Q.sup.1 is a group selected from the group consisting of --CH.sub.3, --CF.sub.3, --C.sub.2 H.sub.5 and --C.sub.2 F.sub.5 ; and q is an integer of 4 to 12. This carboxylic acid ester compound may be used as an antiferroelectric liquid crystal material, and also be used as a liquid crystal composition by using other liquid crystal material in combination. A liquid crystal element which is formed by filling the carboxylic acid ester compound in a gap between two substrates opposite to each other shows excellent properties required for antiferroelectric liquid crystal elements, for example, high speed switching.
该发明的羧酸酯化合物由以下公式[I]表示:其中R是3-20个碳原子的烷基基团;n为0或1;A.sup.1,A.sup.2和A.sup.3中至少一个是具有四氢萘结构的基团,A.sup.1,A.sup.2和A.sup.3的剩余基团分别独立地为具有特定芳香环结构的基团,如苯基和联苯基;Y.sup.1和Y.sup.2分别独立地为选自--COO--,--CH.sub.2 CH.sub.2--和--CH.sub.2 O--的基团;Q.sup.1是选自--CH.sub.3,--CF.sub.3,--C.sub.2 H.sub.5和--C.sub.2 F.sub.5的基团;q为4到12的整数。该羧酸酯化合物可用作反铁电液晶材料,并且可以通过与其他液晶材料组合使用作为液晶组分。通过在两个互相对立的基板之间填充羧酸酯化合物形成的液晶元件显示出反铁电液晶元件所需的优异性能,例如高速切换。