Patent ID: 8168081

Claim:
A liquid-crystalline medium comprising a mixture of dielectrically negative, polar compounds, which comprises one or more compounds of formula I in which R 11 and R 12 each, independently of one another, denote H, an unsubstituted alkyl or alkenyl radical having up to 15 C atoms, in which one or more CH 2 groups may be replaced by —O—, —S—, —C≡C—, —CF 2 —O—, —O—CF 2 —, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, one of the rings present denotes and another of the rings to present denotes and the others, if present, each, independently of one another, denote Z 11 to Z 13 each, independently of one another, denote —CH 2 —CH 2 —, —CH═CH—, —C≡C—, —CH 2 —O—, —O—CH 2 —, —CO—O—, —O—CO—, —CF 2 —O—, —O—CF 2 —, —CF 2 —CF 2 — or a single bond, and m and n each, independently of one another, denote 0 or 1, and one or more compounds selected from formulae II-3, II-5, II-6 and II-7 in which R 21 and R 22 each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms, in which one or more CH 2 groups may be replaced by —O—, —S—, —C≡C—, —CF 2 —O—, —O—CF 2 —, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another.