申请人:CHISSO CORPORATION
公开号:EP0293763A2
公开(公告)日:1988-12-07
A smectic liquid crystal mixture having a broad smectic C phase temperature range including room temperature, a ferroelectric smectic liquid crystal mixture having a large spontaneous polarization, comprising the above smectic mixture and at least one optically active compound, and a liquid crystal display element having an improved response time, containing the above ferroelectric smectic liquid crystal mixture are provided, which smectic liquid crystal mixture comprises
(1) at least two components at least one of which is a pyrimidine compound expressed by the formula
wherein R¹ and R² each are a linear alkyl group having 1 -20 carbons;
(2) at least one pyrimidine compound of the formula (I) and at least one pyrimidine compound expressed by the formula
wherein R³ and R⁴ each are a linear alkyl group having 1 - 18 carbons; or
(3) at least one pyrimidine compound of the formula (I) and at least one biphenylpyrimidine compound expressed by the formula
wherein R⁵ and R⁶ each are a linear alkyl or alkoxy group each having 1 - 18 carbons.
提供了一种具有包括室温在内的较宽 Smectic C 相温度范围的 Smectic 液晶混合物,一种具有较大自发极化的铁电 Smectic 液晶混合物(由上述 Smectic 混合物和至少一种光学活性化合物组成),以及一种具有更佳响应时间的液晶显示元件(包含上述铁电 Smectic 液晶混合物),该 Smectic 液晶混合物包括
(1) 至少两种成分,其中至少一种是由式表示的嘧啶化合物
其中 R¹ 和 R² 各为具有 1-20 个碳原子的直链烷基;
(2) 至少一种式(I)嘧啶化合物和至少一种式(I)嘧啶化合物
其中 R³ 和 R⁴ 各为含 1-18 个碳原子的直链烷基;或
(3) 至少一种式(I)嘧啶化合物和至少一种联苯嘧啶化合物,其结构式为
其中 R⁵和 R⁶ 各为具有 1-18 个碳原子的直链烷基或烷氧基。