Patent ID: 7074462
Filing Date: 2006-07-11
Classification: C09K

Abstract:
1. Liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, which comprises one or more compounds of the formula I in which R is H, an alkyl radical having from 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF A (a) a trans-1,4-cyclohexylene radical, in which, in addition, one or more non-adjacent CH (b) a 1,4-phenylene radical, in which, in addition, one or two CH groups are optionally replaced by N, (c) a 1,4-cyclohexenylene radical, or (d) a radical selected from the group consisting of 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, where the radicals (a) to (d) are optionally monosubstituted or polysubstituted by CN or fluorine, Z and Z L Y is F, Cl, CN, or an alkyl or alkoxy radical having from 1 to 6 carbon atoms which is substituted by one or more halogen atoms and in which, in addition, one or more CH m is 0 or 1, with the provisos that: a) when m=0 and A 2 = Z is not single bond and b) when m=0, A 2 = and Z=—COO—, L 1 is F.