Patent ID: 6827990
Filing Date: 2004-12-07
Classification: C09K

Abstract:
A liquid-crystalline medium comprising a mixture of polar compounds of positive dielectric anisotropy, wherein the medium comprises one or more compounds of the formula I in whichR1 is a halogenated or unsubstituted alkyl or alkoxy radical having from 1 to 15 carbon atoms, where one or more CH2 groups in these radicals are optionally, independently of one another, replaced by â€”Câ‰¡Câ€”, â€”CH&boxH;CHâ€”, â€”Oâ€”, â€”COâ€”Oâ€” or â€”Oâ€”COâ€” in such a way that O atoms are not linked directly to one another, X is F, Cl, CN, SF5, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having 1 to 6 carbon atoms, and L1 and L2 are each, independently of one another, H or F, and further comprises one or more compounds of the formulae O1 and O2: in whichalkyl and alkyl* are each, independently of one another, a straight-chain or branched alkyl group having 1-7 carbon atoms.