| 摘要 |
<p>#CMT# #/CMT# Liquid crystal medium (Q) comprises one or more fluoro-substituted-benzene compound (I). #CMT# : #/CMT# Liquid crystal medium (Q) comprises one or more fluoro-substituted-benzene compound of formula (I). R 0> : 1-15C-alkyl- or alkoxy, where one or more CH 2 groups are substituted by C?=C, CF 2O, CH=CH, cyclobutane-1,3-yl, spiro[3.3]heptane-2,6-yl, O, CO-O or OCO, the O atoms are not directly connected and one or more hydrogen atoms are substituted by halo; L 1> : H or F (preferred); n : 1 or 2 (preferred); and ring A, ring B : 2-fluoro-benzene-1,4-yl, 1,3-difluoro-benzene-2,5-yl (both preferred), cyclohexane-1,4-yl, benzene-1,4-yl. Independent claims are included for: (1) the new or known fluoro-substituted-benzene compound (I); and (2) the preparation of (Q) comprising mixing (I) with one or more benzene compound of formula (II) or (XXVII), dibenzene compound of formula (III)-(VIII), fluoro-substituted dibenzene compound of formula (X) or (XI), tri-benzene compound of formula (XII)-(XV), difluoro-substituted tetrabenzene compound of formula (XXI) or (XXII) and liquid crystalline compounds and/or additives. Ring C : 1,4-phenyl or trans-1,4-cyclohexyl; a : 0 or 1; R 3> : 2-9C-alkenyl, preferably R3a-CH=CH- or R3a-CH=CH-CH 2-CH 2-; R 4> : R 0>, preferably R4a-CH=CH- or R4a-CH=CH-CH 2-CH 2-; R3a, R4a : H, CH 3, C 2H 5 or C 3H 7; Y 1>-Y 4> : H o F; X 0> : F, Cl, CN, SF 5, SCN, NCS, halogenated up to 6C-alkyl, -alkenyl, -alkoxy or -alkenyloxy; 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, CF 2O or OCF 2; r : 0 or 1; ring D, ring E : cyclohexane-1,4-yl, tetrahydro-pyran-2,5-yl or [1,3]dioxane-2,5-yl; and R 1>, R 2> : 2-9C- n-alkyl, -alkoxy, -oxaalkyl, -fluoroalkyl or -alkenyl. Provided that: both the ring D and E are not simultaneously cyclohexyl. In formula (V), (VI): Z 0> : CF 2O, COO (both preferred), C 2H 4, (CH 2)4, CH=CH, CF=CF, C 2F 4, CH 2CF 2, CF 2CH 2, CH 2O, OCH 2, OCF 2 or a bond. #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#USE : #/CMT# (Q) is useful for electro-optical purposes, preferably electro-optical liquid crystal display (claimed). (Q) is useful as dielectrics in display devices, preferably cells with dynamic scattering, deformation of aligned phase cells, guest/host cells, twisted nematic cell, super-twisted nematic cell, super birefringence effect cell, optical mode interference cell, in-plane switching cell, television and video applications (preferably pocket television, liquid-crystal display television, personal digital assistant, notebooks and), high informative displays for computer applications (preferably laptops) and in the automobile or aircrafts. #CMT#ADVANTAGE : #/CMT# (Q) exhibits good chemical-, thermal-, electrical-, UV- and temperature- stability, high positive dielectric anisotropy, broad nematic phases, low birefringence, high specific resistance, quality, fast switching times and improved storage stability. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Composition: (Q) further comprises benzene compound (II) or (XXVII), dibenzene compounds (III)-(VIII), fluoro-substituted dibenzene compounds (X) or (XI), tri-benzene compounds (XII)-(XV), difluoro-substituted tetrabenzene compounds (XXI) or (XXII). Preferred Components: The amount of (I), (II) and/or (III) and (VI) (in which Z 0> is CF 2O) is 1-25 wt.%, 25-80 wt.% and 5-30 wt.%, respectively. #CMT#SPECIFIC COMPOUNDS : #/CMT# 92 Compounds (I) are disclosed e.g. 4-(2,2-difluoro-vinyloxy)-3,5,2'-trifluoro-4'-(4-pentyl-cyclohexyl)-biphenyl of formula (Ia), 4-(2,2-difluoro-vinyloxy)-4'-(4-ethyl-cyclohexyl)-3,5,2'-trifluoro-biphenyl, 4-(2,2-difluoro-vinyloxy)-3,5,2'-trifluoro-4'-(4-propyl-cyclohexyl)-biphenyl, 4'-(4-butyl-cyclohexyl)-4-(2,2-difluoro-vinyloxy)-3,5,2'-trifluoro-biphenyl and 4'-(2,2-difluoro-vinyloxy)-4-(4-ethyl-cyclohexyl)-2,3'-difluoro-biphenyl. #CMT#[Image]#/CMT# #CMT#EXAMPLE : #/CMT# Typical liquid crystal medium comprised of (in %): 4''-propyl-4-chloro-2',2''-difluoro-[1,1';4',1'']terphenyl (2); 4'-((E)-propenyl)-4-propyl-bicyclohexyl (36); 4-((E)-propenyl)-4'-p-tolyl-bicyclohexyl (14.50); 4''-(2,2-difluoro-vinyloxy)-3'',5''-difluoro-4-propyl-[1,1';4',1'']terphenyl (30); 4-[difluoro-(3,4,5-trifluoro-phenoxy)-methyl]-3,5-difluoro-4'-propyl-biphenyl (8); 4''-butyl-4-ethyl-3''-fluoro-[1,1';4',1''] terphenyl (4); and 4'-methyl-4-((E)-pent-3-enyl)-biphenyl (5.50).</p> |
