Pyrimidine derivative, liquid crystal composition comprising the derivative, and liquid crystal display device fabricated by using the composition
申请人:Chisso Corporation
公开号:US06326065B1
公开(公告)日:2001-12-04
Liquid crystalline compounds having a comparatively high voltage holding ratio, high &Dgr;n and high &Dgr;&egr;, and excellent miscibility with known liquid crystalline compounds at low temperatures. The novel compounds have the formula (1)
wherein R represents hydrogen atom or an alkyl group having 1 to 20 carbon atoms; n1 and n2 are independently 0, 1, or 2 provided that the sum of n1 and n2 is 1 or 2; ring A and ring B independently represent 1,4-phenylene, fluorine substituted 1,4-phenylene expressed by the formula (a) in the specification or 1,4-cyclohexylene provided that at least one of ring A and ring B is fluorine substituted 1,4-phenylene expressed by the formula (a); Za, Zb, and Zc independently represent single bond, —CH2CH2—, —COO—, —CF2O—, or —CH2CH2CH2CH2—; Q1, Q2, Q3, Q4, Q5, Q6, and Q7 independently represent hydrogen atom, a halogen atom, or methyl group provided that when at least one of Za, Zb, and Zc is —CH2CH2—, then Q2 is fluorine atom, and that when Za, Zb, and Zc are all single bonds, then Q1, Q2, Q3, Q4, Q5, Q6, and Q7 independently represent hydrogen atom or fluorine atom; Y represents hydrogen atom, a halogen atom, or a halogenated alkyl group having 1 to 5 carbon atoms; and each atom constituting this compound may be replaced by its isotope.
具有相对较高的电压保持比、高Δn和高Δε值,并且在低温下与已知液晶化合物具有良好的溶解性的液晶化合物。这些新颖的化合物具有以下结构式(1)其中R代表氢原子或具有1至20个碳原子的烷基基团;n1和n2独立地为0、1或2,前提是n1和n2的和为1或2;环A和环B独立地代表1,4-苯基、规定中的公式(a)表示的氟取代1,4-苯基或1,4-环己基,前提是环A和环B中至少有一个是由公式(a)表示的氟取代1,4-苯基;Za、Zb和Zc独立地代表单键、—CH2CH2—、—COO—、—CF2O—或—CH2CH2CH2CH2—;Q1、Q2、Q3、Q4、Q5、Q6和Q7独立地代表氢原子、卤素原子或甲基基团,前提是当至少其中一个为—CH2CH2—时,Q2为氟原子,以及当Za、Zb和Zc均为单键时,Q1、Q2、Q3、Q4、Q5、Q6和Q7独立地代表氢原子或氟原子;Y代表氢原子、卤素原子或具有1至5个碳原子的卤代烷基基团;此化合物的每个原子都可以被其同位素取代。