Patent ID: 7052744

Claim:
A nematic liquid-crystal mixture comprising at least two liquid crystalline compounds, wherein said mixture contains one or more compounds of formula I wherein R 1 is alkyl having up to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, and wherein optionally one or more CH 2 groups in R 1 are each replaced by —O—, —S—, —C≡C—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and R 2 is alkenyl having up to 15 carbon atoms which is unsubstituted, or monosubstituted by CN or CF 3 , or at least monosubstituted by halogen, and wherein optionally one or more CH 2 groups in R 2 are each replaced by —O—, —S—, —C≡C—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another.