LIQUID CRYSTALLINE COMPOUND HAVING PIPERIDINE RING, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:CHISSO CORPORATION
公开号:EP1072593A1
公开(公告)日:2001-01-31
The present invention relates to a novel liquid crystalline compound represented by Formula (1):
wherein R represents an alkyl group having 1 to 10 carbon atoms or a fluoroalkyl group having 1 to 10 carbon atoms, and R' represents an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom or a cyano group, in which any methylene groups which are not adjacent to each other in these alkyl groups and any methylene groups and/or fluoromethylene groups which are not adjacent to each other in the fluoroalkyl groups may be substituted with oxygen atoms, sulfur atoms or -CH=CH-; the rings A1, A2, A3 and A4 each independently represent 1,4-cyclohexylene, 1,4-phenylene in which 1 to 2 hydrogen atoms may be substituted with fluorine atoms, dioxane-2,5-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, piperidine-1,4-diyl or 1-sila-1,4-cyclohexylene; B1, B2, B3, B4 and B5 each independently represent a single bond, -CH2CH2-, -CH=CH-, -OCH2-, -CH2O-, -(CH2)4-, -OCO- or -COO-; l, m, n and p each independently represent 0 or 1; and Z represents one group selected from the following moieties (I) to (V):
provided that
when Z is the moiety (II), l + m + n + p > 0, and the rings A1, A2, A3 and A4 each independently represent 1,4-phenylene in which 1 to 2 hydrogen atoms are substituted with fluorine atoms, pyrimidine-2,5-diyl, pyridine-2,5-diyl, piperidine-1,4-diyl or 1-sila-1,4-cyclohexylene; and that when Z is the moiety (III) and l = m = n = p = 0, R is an alkyl group, and R' is not a fluorine atom or a cyano group when B5 is a single bond. The present invention further relates to a liquid crystal composition comprising the above compound and a liquid crystal display element comprising the above composition.
The liquid crystalline compound of the present invention has a particularly large dielectric anisotropy and refractive anisotropy and a low viscosity and is excellent in a low temperature compatibility.
本发明涉及一种新颖的液晶化合物,其表示为式(1)所示:其中R代表具有1至10个碳原子的烷基基团或具有1至10个碳原子的氟烷基基团,R'代表具有1至10个碳原子的烷基基团、具有1至10个碳原子的氟烷基基团、氟原子、氯原子、溴原子或氰基,在这些烷基基团中不相邻的任何亚甲基基团和不相邻的亚甲基和/或氟亚甲基基团可以用氧原子、硫原子或-CH=CH-取代;环A1、A2、A3和A4分别独立地表示1,4-环己亚甲基、1,4-苯基,其中1至2个氢原子可以用氟原子取代,二氧杂环戊二亚基、嘧啶-2,5-二亚基、吡啶-2,5-二亚基、哌啶-1,4-二亚基或1-硅-1,4-环己亚甲基;B1、B2、B3、B4和B5分别独立地表示单键、-CH2CH2-、-CH=CH-、-OCH2-、-CH2O-、-(CH2)4-、-OCO-或-COO-;l、m、n和p各自独立地表示0或1;Z表示从以下基团(I)到(V)中选择的一个基团:但是当Z为基团(II)时,l + m + n + p > 0,环A1、A2、A3和A4分别独立地表示1,4-苯基,其中1至2个氢原子被氟原子取代,嘧啶-2,5-二亚基、吡啶-2,5-二亚基、哌啶-1,4-二亚基或1-硅-1,4-环己亚甲基;当Z为基团(III)且l = m = n = p = 0时,R为烷基基团,当B5为单键时,R'不是氟原子或氰基。本发明还涉及包括上述化合物的液晶组合物和包括上述组合物的液晶显示元件。本发明的液晶化合物具有特别大的介电各向异性和折射各向异性,低粘度,并且在低温兼容性方面表现出色。