Liquid crystalline medium

摘要

Liquid crystal medium (A) comprises one or more 5-cyclohexyl-2-phenyl-tetrahydro-pyran compound (I). Liquid crystal medium (A) comprises one or more 5-cyclohexyl-2-phenyl-tetrahydro-pyran compounds of formula (I). R 0>halogenated or unsubstituted 1-15C alkyl- or alkoxy residue with 1 to 15 C atoms, where one or more CH 2-groups are substituted by -C?=C-, -CF 2O-, -CH=CH-, cyclobutane, spiro[3.3]heptane, -O-, -CO-O- or -O-CO- and the oxygen atoms are not connected directly; X 0>F, Cl, CN, SF 5, SCN, NCS, halogenated alkyl residue, halogenated alkenyl residue, halogenated alkoxy residue or halogenated up to 6C alkenyloxy residue; and Y 1>, Y 2>H or F. An independent claim is included for the preparation of (A) comprising mixing (I) with further 4-(difluoro-phenoxy-methyl)-bicyclohexyl compound of formula (II), 4-(difluoro-phenoxy-methyl)-biphenyl compound of formula (III), 4-phenyl-bicyclohexyl compound of formula (IV), 4-cyclohexyl-biphenyl compound of formula (V), [1,1';4',1'']terphenyl compound o of formula (VI) and cyclohexane-phenyl compound of formulae (VII) and (VIII), alkyl-cyclohexane compound of formula (IX) and alkenyl-cyclohexane compound of formula (X), alkenyl-cyclohexane-phenyl compound of formulae (XI) and (XII), and/or a biphenyl compound of formula (XIII), fluorophenyl-cyclohexane compounds of formulae (XX1a) and (XX1b) or with a further liquid crystal compounds and/or additives. Y 3>, Y 4>H or F; ring A : a cyclohexane ring or tetrahydro-pyran ring; 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-; alkyl : 1-7C alkyl; R1a : 1-7C alkyl, 1-6C alkoxy or 2-7C alkenyl; alkenyl, alkenyl1 : 2-7C alkenyl; R 1>, R 2>n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or up to 9C (preferably 2-9C) alkenyl; and r : 0 or 1. In formula (V):Z 0> = a single bond or -CF 2O-. In formula (VI):Z 0> = a single bond. In formula (VIII): Z 0>-CF 2O-. [Image] [Image] [Image] [Image] [Image] [Image] [Image] [Image] [Image].