Patent ID: 7105210

Claim:
A liquid-crystalline medium comprising a mixture of polar compounds of positive dielectric anisotropy, which comprises one or more compounds of the formula I and one or more compounds of the formula IA in which the individual radicals have the following meanings: R 1 and R 2 are each, independently of one another, H, a halogenated or unsubstituted alkyl radical having from 1 to 15 carbon atoms, where one or more CH 2 groups in these radicals are optionally replaced, in each case independently of one another, by —C≡C—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, X 1 and X 2 are each, independently of one another, F, Cl, CN, SF 5 , SCN, or OCN, or a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical each having 1 to 6 carbon atoms, Z 1 is —CH 2 CH 2 —, —CH═CH—, —C≡C—, —COO—, —CH 2 O—, —OCH 2 —, —OOC—, —(CH 2 ) 4 —, —CHFO—, —CH═CF—, —CF═CH—, —CF═CF—, —C 2 F 4 —, —CF 2 O—, —OCF 2 — or a single bond, L 1-8 are each, independently of one another, H or F, provided that at least one of L 5 , L 6 , L 7 or L 8 is F.