Carboxylate compounds, liquid crystal compositions and liquid crystal elements containing said compounds and method of optical modulation using said elements
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0431929A2
公开(公告)日:1991-06-12
The invention provides carboxylate compounds of the following formula (A):
wherein R is a group selected from C₃-C₂₀ alkyl, C₃-C₂₀ alkoxy and halogenated C₃-C₂₀ alkyl, X and Y are each, independently, a group selected from: -COO-,-OCO-, -CH₂CH₂-. CH₂O-, OCH₂-, -S-S-,
and
or a single bond, A and B are each, independently, a group selected from
and
and R* is an optically active group of 4 to 20 carbon atoms, the group containing at least one asymmetric carbon atom and being optionally substituted by one or more halogen atoms, and m and n are each an integer of 0 to 2; with the proviso that both m and n are not 0 at the same time.
The compounds are employed in liquid crystal compositions. A liquid crystal element containing such a composition, a process for the preparation of the element and a method of light modulation involving use of the element are also disclosed.
本发明提供下式(A)的羧酸盐化合物:
CH₂-,OCH₂-,-S-S-、
和
或单键,A 和 B 各自独立地为选自以下的基团
和
和 R* 是 4 至 20 个碳原子的光学活性基团,该基团含有至少一个不对称碳原子,并可选择被一个或多个卤素原子取代,且 m 和 n 均为 0 至 2 的整数;但 m 和 n 不能同时为 0。
这些化合物可用于液晶组合物中。此外,还公开了含有这种组合物的液晶元件、制备该元件的工艺以及涉及使用该元件的光调制方法。