| 摘要 |
#CMT# #/CMT# Liquid crystalline medium (A) with positive dielectric anisotropy based on a mixture of compounds, comprises one or more 1,2-difluoroethene compound (I). #CMT# : #/CMT# Liquid crystalline medium (A) with positive dielectric anisotropy based on a mixture of compounds, comprises one or more 1,2-difluoroethene compound of formula (I). R 1>halogenated or unsubstituted 1-15C alkyl- or alkoxy residue (where one or more CH 2-group is replaced by -Ctriple boundC-, -CH=CH-, -O-, -CO-O- or -O-CO-, and O atoms are not connected directly together); A 1>-cyclohexane-, 4 heterocyclic compound e.g. -dioxane- or -pyrimidine-, -fluoro-benzene-, -1,3-difluoro-benzene-, -phenyl- or bicyclic compound of formula (a); Z 1>, Z 2>a single bond, -Ctriple boundC-, -CF=CF- (preferred), -CH=CH-, -CF 2O- or -CH 2CH 2-; X : F, Cl, CN, SF 5 or halogenated or unsubstituted 1-15C alkyl- or alkoxy (where one or more CH 2-group is replaced by -Ctriple boundC-, -CH=CH-, -O-, -CO-O- or -O-CO-, and the O atoms are not connected directly together); L 1>-L 6>H or F; and m : 0-1. Independent claims are included for: (1) an electro optical liquid crystal display comprising (A); and (2) a difluoroethene compound of formula (Ia). m : 1-2. #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#USE : #/CMT# (A) is useful for electro optical purposes such as electro optical liquid crystal display (claimed). #CMT#ADVANTAGE : #/CMT# (I) is chemically and thermally stable. (I) exhibits low rotation viscosity, very high resistivity and low threshold voltages. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Components: (A) further comprises 12 cyclic compounds e.g. cyclohexane compound of formula (K-1), (K-3) or (K-12); 8 cyclic compounds e.g. cyclohexane-alkyl compound of formula (Z-1) or cyclohexane compound of formula (Z-2) or heterocyclic compound of formula (Z-8); 5 cyclic compounds e.g. aromatic-cyclohexane compound of formula (II) or (III); 2 cyclic compounds of formula (XIV) or (XV); 4 cyclic-keto-ester compounds e.g. keto-ester compound of formula (E-a) or (E-d); 2 cyclohexane-alkyl compounds of formula (O1) or (O2); and 2 dioxane compounds of formula (D1) or (D2). R 0>n-alkyl, oxaalkyl, fluoroalkyl or 0-9C alkenyl; R-1a, R-2a : H, CH 3, C 2H 5 or n-C 3H 7; Alkyl, Alkyl1 : an unsubstituted 1-7C n-alkyl; Alkenyl : an unsubstituted 2-7C alkenyl; R 0>n-alkyl, oxaalkyl, fluoroalkyl or 0-9C alkenyl; X 0>alkyl, alkenyl, alkenyloxy or 0-6C alkoxy (all halogenated), F or Cl; Y 1>-Y 4>H or F; ring A, B : 1,4-phenylene (substituted with 0-2 fluorine); and r : 0-1. #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT#. |
