| 摘要 |
<p>#CMT# #/CMT# Liquid crystal medium comprising p-quaterphenyl derivatives (I) is new. #CMT# : #/CMT# Liquid crystal medium comprising p-quaterphenyl derivatives of formula (I) is new. R 1>, R 2> : optionally halogenated 1-15C alkyl or alkoxy, optionally with CH 2 groups replaced by ethynylene, CF 2O, CH=CH, 1,3-cyclobutylene, 2,5-spiro[3.3]cycloheptylene, O, COO or OCO; X 1>-X 12> : H or F, at least one being F. An independent claim is also included for an electrooptic liquid crystal display comprising a liquid crystal medium as above. #CMT#[Image]#/CMT# #CMT#USE : #/CMT# The liquid crystal medium is useful for electrooptic purposes (claimed), especially in displays. #CMT#ADVANTAGE : #/CMT# The liquid crystal medium has a high dielectric anisotropy and a low threshold voltage. #CMT#ORGANIC CHEMISTRY : #/CMT# The medium preferably also contains liquid crystal compounds of formula (II)-(XIII) and/or (XXIa). Y 1>-Y 4> : H or F; R 0> : R 1>, X 0> : F, Cl, CN, SF 5, SCN, NCS, haloalkyl, haloalkenyl, haloalkoxy or haloalkenyloxy; A, B : trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; Z 0> : C 2H 4, (CH 2) 4, CH=CH, CF=CF, C 2F 4, CH 2CF 2, CF 2CH 2, CH 2O, OCH 2, COO or OCF 2, also a single bond in (V) and (VI), also CF 2O in (V) and (VIII); L : H or F; R' : 1-7C alkyl, 1-6C alkoxy or 2-7C alkenyl. #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# #CMT#[Image]#/CMT#.</p> |
