| 摘要 |
<p>#CMT# #/CMT# Liquid crystal medium (A) based on a mixture of polar compounds, comprises a substituted 1,2,8-trifluoro-naphthalene compound (I). #CMT# : #/CMT# Liquid crystal medium (A) based on a mixture of polar compounds, comprises a substituted 1,2,8-trifluoro-naphthalene compound of formula (I). R 11>, R 12>1-15C alkyl or alkenyl residue (optionally substituted by CN, CF 3 or halo), where one or more CH 2-group is replaced by -O-, -S-, cyclobutane, -C=C-, -CF 2-, -OCO- or -O-CO-, and the O atoms are not connected directly together; ring L 1>, L 2>cyclohexen-1,4-yl or bicyclohexyl-3-en-4,4'-yl; ring N 1>1,2,8-trifluoro-naphthalen-3,7-yl; and either a, b : 0 or 1 ; or a+b : +- 1. Independent claims are included for: (1) the preparation of (A) comprising mixing (I) with one or more mesogenic compounds; and (2) an electro-optical display with an active matrix addressing based on the electrically controlled birefringence, plasma addressed liquid crystal, fringe field switching or in plane switching effect, comprising (A) as dielectric component. #CMT#[Image]#/CMT# #CMT#USE : #/CMT# (A) is useful in electro-optical display (claimed). (A) is useful for screens of television sets, computers (such as laptops or desktops), switching centers, gambling device, electro-optical display, such as watches, calculators, electronic pocket games, chess computers, portable data storage system, such as personal digital assistants or mobile phones and navigation devices, preferably for all displays, where moving images are presented. #CMT#ADVANTAGE : #/CMT# (I) provides multiple field key display with very high specific resistance, large working temperature range, short switching times and low threshold voltage. (A) exhibits high level birefringence, relatively high value for the holding ratio and at the same time shows very good stability at low temperature, preferably at -30[deg] C to -40[deg] C. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Composition: (A) further comprises aromatic compounds of formulae (IIA) and (IIB), and a cyclic compound of formula (III). (A) comprises 2-4 or more compounds of (I). (A) comprises (I) (at least 2 (preferably 2-20) wt.%); (IIA) and/or (IIB) (at least 20 (preferably 20-80) wt.%); and (III) (at least 5 wt.%). ring A : cyclohexan-1,4-yl, tetrahydro-pyran-2,5-yl or cyclohexen-1,4-yl; Z 2>a single bond, -CH=CH-, -CH 2O-, -OCH 2-, -CF 2O-, -OCF 2-, -O-, -CH 2- or -CH 2CH 2; p : 1 or 2; L 1>-L 4>F (preferred), Cl, OCF 3, CF 3, CH 3, CH 2F or CHF 2; R 2>, R 31>, R 32>R 11>; ring A 31>-A 33>benzen-1,4-yl, cyclohexan-1,4-yl, 2-fluoro-benzen-1,4-yl, 1,3-difluoro-benzen-2,5-yl, cyclohexen-1,4-yl, tetrahydro-pyran-2,5-yl, [1,3]dioxan-2,5-yl, 3,4-dihydro-2H-pyran-3,6-yl, 2-fluoro-cyclohexen-1,4-yl or bicyclo[2.2.2]octan-1,4-yl; Z 31>, Z 32>single bond, -CH 2CH 2-, -C=C-, -CH=CH-, -CF 2O-, -OCF 2-, -CF=CF-, -CF=CH-, -CH=CF-, -CH 2CF 2-, -CF 2CH 2-, -COO-, -OCO-, -CH 2O-, -OCH 2- or -(CH 2) 4-; r : 0-2; and v : 1-6. #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#SPECIFIC COMPOUNDS : #/CMT# The use of 7-butoxy-1,2,8-trifluoro-3-(4-pentyl-cyclohex-1-enyl)-naphthalene of formula (Ia) and 7-butoxy-1,2,8-trifluoro-3-(4-propyl-cyclohex-1-enyl)-naphthalene is disclosed as (I). #CMT#EXAMPLE : #/CMT# Typical composition comprised (in %): 7-butoxy-1,2,8-trifluoro-3-(4-pentyl-cyclohex-1-enyl)-naphthalene (20); 7-butoxy-1,2,8-trifluoro-3-(4-propyl-cyclohex-1-enyl)-naphthalene (12); 4'-(2,3-difluoro-4-propoxy-phenyl)-4-propyl-bicyclohexyl (10); 4-pentyl-4'-vinyl-bicyclohexyl (30); 4'-((E)-propenyl)-4-propyl-bicyclohexyl (10); 4'-p-tolyl-4-vinyl-bicyclohexyl (8); and 4'-butyl-4-propyl-bicyclohexyl (10).</p> |
