Optically active naphthalene derivative, process for preparation thereof, liquid crystal composition containing the same as effective component, and liquid crystal element using the same
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0416946A2
公开(公告)日:1991-03-13
Disclosed herein are a novel optically active naphthalene derivative, a process of the preparation thereof a ferroelectric liquid crystal composition containing the same and a liquid crystal element using the composition.
The above optically active naphthalene derivatives including optically active naphthylcarboxylic acid derivative, hydroxynaphthalene derivative, alkoxynaphthylalkanol derivative and alkylnaphthylalkanol derivative have the following structural formula:
wherein R' denotes an alkyl group of 3-20 carbon atoms, R2 denotes an alkyl group of 1-20 carbon atoms optionally substituted with halogen atom(s) or an alkoxyalkyl group of 2-20 carbon atoms optionally substituted with halogen atom(s), X denotes -COO- or -OCO-, k, t and m denotes 0 or 1 respectively, n denotes an integer of 0-6, p denotes 0 or 1, and an asterisk indicates an asymmetric carbon atom, proviso when k is 0, t and m are not 1 at the same time, when k is 1, m is 1, and when n is 0 and m is 1, X is -COO-.
These optically active naphthalene derivatives are useful as a ferroelectric liquid crystal material or its component having a sufficient spontaneous polarization and by which a high speed response is possible and which further exhibits a ferroelectric liquid crystal phase in a temperature region around room temperature.
本文公开了一种新型光学活性萘衍生物、其制备工艺、含有该衍生物的铁电液晶组合物以及使用该组合物的液晶元件。
上述光学活性萘衍生物包括光学活性萘甲酸衍生物、羟基萘衍生物、烷氧基萘烷醇衍生物和烷基萘烷醇衍生物,其结构式如下:
其中 R' 表示 3-20 个碳原子的烷基,R2 表示 1-20 个碳原子的烷基,可选择被卤素原子取代,或 2-20 个碳原子的烷氧基烷基,可选择被卤素原子取代,X 表示 -COO- 或 -OCO-、k、t 和 m 分别表示 0 或 1,n 表示 0-6 的整数,p 表示 0 或 1,星号表示不对称碳原子,但当 k 为 0 时,t 和 m 不能同时为 1,当 k 为 1 时,m 为 1,当 n 为 0 而 m 为 1 时,X 为-COO-。
这些具有光学活性的萘衍生物可用作铁电液晶材料或其成分,它们具有足够的自发极化,可实现高速响应,并在室温附近的温度区域进一步显示出铁电液晶相。