Patent ID: 7582337

Claim:
A liquid-crystalline medium based on a mixture of polar compounds, comprising at least one compound of formula I in which R 11 and R 12 each, independently of one another, denote an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, in which optionally one or more CH 2 groups are replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, each, independently of one another, denote a and b each, independently of one another, denote 0 or 1, where a+b≧1.