Patent ID: 7001646

Claim:
A liquid-crystalline medium containing a mixture of polar compounds having positive dielectric anisotropy, said medium comprising one or more alkenyl compounds of formula I and one or more compounds of formula IA wherein: R is a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 carbon atoms, where one or more CH 2 groups in these radicals are optionally, in each case independently of one another, replaced 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, R 1 is an alkenyl radical having 2 to 7 carbon atoms, R 2 is a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 carbon atoms, where one or more CH 2 groups in these radicals are optionally, in each case independently of one another, replaced 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 or, if y is 1 or 2, R 2 can also Q—Y, Q is CF 2 , OCF 2 , CFH, OCFH, OCHFCF 2 , OCF 2 CHFCF 2 or a single bond, Y is F or Cl, X is F, Cl, CN, or a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical, in each case having up to 6 carbon atoms, Z 1 and Z 2 are each, independently of one another, —CF 2 O—, —OCF 2 — or a single bond, where, if z=1, Z 1 ≠Z 2 , and if z=0, Z 1 is —CF 2 O— or —OCF 2 —, are each, independantly of one another, y is 0, 1 or 2, z is 0 or 1, and L 1 , L 2 , L 3 and L 4 are each, independently of one another, H or F, and wherein said medium does not contain cyanophenylcyclohexanes.