Patent ID: 8399073

Claim:
Liquid-crystalline medium having negative dielectric anisotropy based on a mixture of polar compounds, which comprises: at least one compound of the formula I in which R 1 , R 1* each, independently of one another, denote an alkyl radical having 1-6 C atoms, and a denotes 1; and at least one compound selected from the group of the compounds of the formulae IIB and IIC: in which R 2B and R 2C each, independently of one another, denote H, an alkyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may be replaced by —O—,—S—, —C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, L 3 and L 4 each, independently of one another, denote F or Cl, Z 2 and Z 2′ each, independently of one another, denote a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 ——CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —CF═CF—, or —CH═CHCH 2 O—, q denotes 0, and v denotes 1 to 6.