2,3-Difluorophenyl derivative having negative dielectric anisotropy, liquid crystal composition, and liquid crystal display device
申请人:CHISSO CORPORATION
公开号:EP1081123A2
公开(公告)日:2001-03-07
The invention is to provide liquid crystalline compounds having a negative and extremely large dielectric anisotropy value and a small optical anisotropy value at the same time; liquid crystal compositions comprising the compound; and liquid crystal display devices fabricated by using the liquid crystal composition; the liquid crystalline compounds have 2,3-dihalogenophenylene moiety and are expressed by formula (1) wherein Ra and Rb each independently represents a linear or branched alkyl having 1 to 10 carbon, any methylene in the alkyl may be replaced by -O-, -S-, -CH=CH-, or -C≡C-, but -O- is not successive, and any hydrogen in the alkyl may be replaced by halogen; rings A1 to A4 each independently represents trans-1,4-cyclohexylene, cyclohexene-1,4-diyl, pyridine-1,4-diyl, pyrimidine-2,5-diyl, or 1,4-phenylene, wherein at least one hydrogen in these rings may be replaced by halogen, and any nonadjacent methylene in cyclohexane ring may be replaced by -O-; Y1 and Y2 each independently represents F or Cl; Z1, Z2 and Z3 each independently represents a single bond, -CH2CH2-, -(CH2)4-, -COO-, -OCO-, -CH2O-, -OCH2-, -CF2O-, or -OCF2-; and l, m and n each independently is 0, 1 or 2, and the sum of l + m + n is 3 and less.
本发明旨在提供同时具有负的、极大的介电各向异性值和较小的光学各向异性值的液晶化合物;包含该化合物的液晶组合物;以及使用该液晶组合物制造的液晶显示设备;所述液晶化合物具有 2,3-二卤代苯基并由式 (1) 表示 其中 Ra 和 Rb 各自独立地代表具有 1 至 10 个碳的直链或支链烷基,烷基中的任何亚甲基可被 -O-、-S-、-CH=CH- 或 -C≡C- 取代,但 -O- 不能连续,烷基中的任何氢可被卤素取代;环 A1 至 A4 各自独立地代表反式-1,4-环己烯、环己烯-1,4-二基、吡啶-1,4-二基、嘧啶-2,5-二基或 1,4-亚苯基,其中这些环中的至少一个氢可被卤素取代,环己烷环中任何不相邻的亚甲基可被-O-取代;Y1和Y2各自独立地代表F或Cl;Z1、Z2和Z3各自独立地代表单键、-CH2CH2-、-(CH2)4-、-COO-、-OCO-、-CH2O-、-OCH2-、-CF2O-或-OCF2-;以及l、m和n各自独立地为0、1或2,且l+m+n之和为3或更少。