Patent ID: 7754103

Claim:
Liquid-crystalline medium based on a mixture of polar compounds, comprising one or more compounds of the formula I and one or more compounds of the formula IA in which R 1 and R 1A each, independently of one another, denote a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each, independently of one another, be replaced by —C≡C—, —CH═CH—, —O—, —CO—O—, —CF 2 O—, —OCF 2 —, or —O—CO— in such a way that O atoms are not linked directly to one another, X and X A each, independently of one another, denote F, Cl, CN, SF 5 , SCN, NCS, halogenated alkyl radical, halogenated alkenyl radical, halogenated alkoxy radical or halogenated alkenyloxy radical having up to 6 C atoms, A 1 a) denotes a 1,4-cyclohexenylene or 1,4-cyclohexylene radical, in which one or two non-adjacent CH 2 groups may be replaced by —O— or —S—, c) a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, c)a radical from the group piperidine-1,4-diyl, 1,4-bicyclo [2.2.2] octylene, a naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydro-naphthalene-2,6-diyl, phenanthrene-2,7-diyl, fluorene-2,7-diyl, where the radicals a), b) and c) may be mono- or polysubstituted by halogen atoms, Z 1 denotes —CO——O—, —O—CO—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —CH 2 CH 2 —, —(CH 2 ) 4 —, —C 2 F 4 —, —CH 2 CF 2 —, —CF 2 CH 2 —, —CF═CF—, —CH═CF—, —CF═CH—, —CH═CF—, —CF═CH—, —CH═CH—, —C≡C—or a single bond, L 1 is F, L 2 and L 3 are H L 4 to L 7 each, independently of one another, denote H or F, and n denotes 0, 1 or 2.