申请人:Chisso Corporation
公开号:US04882083A1
公开(公告)日:1989-11-21
A smectic C liquid crystal mixture having a broad smectic C phase temperature range including room temperature, a ferroelectric smectic C liquid crystal mixture having a large spontaneous polarization, comprising the above smectic C mixture and at least one optically active compound, and a liquid crystal display element having an improved response time, containing the above ferroelectric smectic C liquid crystal mixture are provided, which smectic C liquid crystal mixture comprises (1) at least two components at least one of which is a pyrimidine compound expressed by the formula ##STR1## wherein R.sup.1 represents a linear alkyl group of 4 to 20 carbon atoms and R.sup.2 represents a linear alkyl group having 7-20 carbons and having a smectic C phase; (2) at least one pyrimidine compound of the formula (I) and at least one pyrimidine compound expressed by the formula ##STR2## wherein R.sup.3 represents a linear alkyl group of 6 to 12 carbon atoms and R.sup.4 represents a linear alkyl group having 8 to 11 carbons and having a smectic C phase; or (3) at least one pyrimidine compound of the formula (I) and at least one biphenylpyrimidine compound expressed by the formula ##STR3## wherein R.sup.5 and R.sup.6 each are a linear alkyl or alkoxy group each having 1-18 carbons.
提供了一种拥有广泛的液晶C相温度范围(包括室温)的液晶C混合物,一种具有大自发极化的铁电液晶C混合物,其中包括上述液晶C混合物和至少一种光学活性化合物,以及一种具有改进响应时间的液晶显示元件,其中包含上述铁电液晶C混合物。该液晶C混合物包括(1)至少两种组分,其中至少一种是由以下公式表示的嘧啶化合物之一:##STR1## 其中R.sup.1表示4至20个碳原子的线性烷基,R.sup.2表示具有7-20个碳原子并具有液晶C相的线性烷基;(2)至少一种由公式(I)表示的嘧啶化合物和至少一种由以下公式表示的嘧啶化合物:##STR2## 其中R.sup.3表示6至12个碳原子的线性烷基,R.sup.4表示具有8至11个碳原子并具有液晶C相的线性烷基;或(3)至少一种由公式(I)表示的嘧啶化合物和至少一种由以下公式表示的联苯嘧啶化合物:##STR3## 其中R.sup.5和R.sup.6各自是具有1-18个碳原子的线性烷基或烷氧基。