Patent ID: 8871952

Claim:
A liquid crystalline-medium comprising one or more compounds of formula I in which R 1 and R 2 each, independently of one another, denote H, a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CH═CH—, —(CO)O—, —O(CO)—, —(CO)— or —O— in such a way that O atoms are not linked directly to one another, where R 2 additionally denotes F, Cl, Br, CN, SCN, NCS or SF 5 , A 1 , A 2 , A 3 and A 4 each, independently of one another, identically or differently, denotes: a) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or more non-adjacent CH 2 groups may be replaced by —O— and/or —S—, and in which H may be substituted by F, b) 1,4-phenylene, in which one or two CH groups may be replaced by N, and in which, in addition, one or more H atoms may be replaced by Br, Cl, F, CN, methyl, methoxy or a mono- or polyfluorinated methyl or methoxy group, or c) a radical from the group 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, cyclobut-1,3-diyl, spiro[3.3]heptane-2,6-diyl, in which one or more hydrogen atoms may be replaced by F, CN, SCN, SF 5 , CH 2 F, CHF 2 , CF 3 , OCH 2 F, OCHF 2 or OCF 3 , one or more CH groups may be replaced by N, one or more double bonds may be replaced by single bonds, M denotes —O—, —S—, —CH 2 —, —CHY— or —CYY 1 —, and Y and Y 1 denote Cl, F, CN, OCF 3 or CF 3 , V denotes H or F, Z 1 , Z 2 and Z 3 each, independently of one another, identically or differently, denote a single bond, —CH 2 O—, —(CO)O—, —CF 2 O—, —CH 2 CH 2 CF 2 O—, —CF 2 CF 2 —, —CH 2 CF 2 —, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CH═CH—, —CH═CF—, —CF═CF— or —C≡C—, where asymmetrical bridges may be oriented to both sides, a denotes 0, 1 or 2, b denotes 0, 1, 2 or 3, and c denotes 0, 1 or 2, where a+b+c≦4; and one or more compounds selected from the formulae IV-VIII, XIII-XVI, D1, D2, XVIIa, XVIIIb, XVIII, XIX-XXV, and XXVII: in which R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are each optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —CH═CH—, -O—, —(CO)O— or —O(CO)— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms are each optionally replaced by halogen, X 0 denotes F, Cl, CN, SF 5 , SCN, NCS, or a halogenated alkyl radical, halogenated alkenyl radical, halogenated alkoxy radical or halogenated alkenyloxy radical, in each case having up to 6 C atoms, Y 1-6 each, independently of one another, denote H or F, Z 0 denotes —C 2 H 4 —, —(CH 2 ) 4 —, —CH═CH—, —CF═CF—, —C 2 F 4 —, —CH 2 CF 2 —, —CF 2 CH 2 —, —CH 2 O—, —OCH 2 —, —COO—, —CF 2 O— or —OCF 2 —, and, in formulae V and VI, Z 0 also a single bond, b and c each, independently of one another, denote 0 or 1, R 5 and R 6 each, independently of one another, denote n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 9 C atoms, alkenyl” denotes C 2-7 -alkenyl.