FLUOROALKYLATED LIQUID-CRYSTAL COMPOUNDS, LIQUID-CRYSTAL COMPOSITIONS, AND LIQUID-CRYSTAL DISPLAY ELEMENTS
申请人:CHISSO CORPORATION
公开号:EP0950651A1
公开(公告)日:1999-10-20
The present invention provides liquid crystalline compounds having a very high voltage holding ratio, very little variation of these properties depending on temperature, high Δn, and good compatibility in the other liquid crystal materials particularly under a low temperature, liquid crystal compositions containing these crystalline compounds, and liquid crystal display devices constituted by using the liquid crystal compositions. The liquid crystalline compounds are represented by general formula (1):
wherein R represents an alkyl, alkoxy or alkoxyalkyl group of 2-20 carbon atoms, and in each group, any 1-3 hydrogen atoms may be replaced by fluorine atoms; X shows an halogen atom or an alkyl group of 1-20 carbon atoms, any methylene groups (-CH2-) not adjacent each other in the alkyl group may be replaced by oxygen atoms, and any one or more hydrogen atoms in the alkyl group may be replaced by fluorine atoms; Z1, Z2 and Z3, each independently, represents -(CH2)2-, -(CH2)4-, -CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3- or a covalent bond; Y1-Y16 each independently represent hydrogen atoms or fluorine atoms, but at least two represent fluorine atoms; m represents 0 or 1, and any atom constituting the compound may be replaced by an isotope thereof.
本发明提供的液晶化合物具有极高的电压保持率,这些特性随温度的变化极小,Δn高,特别是在低温下与其他液晶材料的兼容性好,提供含有这些液晶化合物的液晶组合物,以及使用这些液晶组合物构成的液晶显示装置。液晶化合物由通式(1)表示:
其中 R 代表 2-20 个碳原子的烷基、烷氧基或烷氧基烷基,在每个基团中,任意 1-3 个氢原子可被氟原子取代;X 表示卤素原子或 1-20 个碳原子的烷基,烷基中不相邻的亚甲基(-CH2-)可被氧原子取代,烷基中的任意一个或多个氢原子可被氟原子取代;Z1、Z2 和 Z3 各自独立地代表-(CH2)2-、-(CH2)4-、-CH2O-、-OCH2-、-(CH2)3O-、-O(CH2)3- 或共价键;Y1-Y16 各自独立地代表氢原子或氟原子,但至少有两个代表氟原子;m 代表 0 或 1,构成化合物的任何原子可由其同位素取代。