Patent ID: 7303791
Filing Date: 2007-12-04
Classification: C09K

Abstract:
1. A liquid-crystalline medium comprising a mixture of polar compounds of positive or negative dielectric anisotropy, including: one or more compounds of the formula I in which are a) a 1,4-cyclohexenylene or 1,4-cyclohexylene radical, in which one or two non-adjacent CH b) a 1,4-phenylene radical, in which one or two CH groups are optionally replaced by N, c) a radical selected from the group consisting of piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, phenanthrene-2,7-diyl and fluorene-2,7-diyl, where the radicals a), b) and c) are optionally monosubstituted or polysubstituted by halogen atoms, x, y and z are each, independently of one another, 0, 1 or 2, Z X is F, Cl, CN, NCS, CF a is 0, 1 or 2, b is 0, 1 or 2, and c is 0, 1 or 2, where a+b+c is from 1 to 3; and additionally comprising one or more compounds of the formula RI to RII, RIV to RVIII, RX to RXII and RXIV: in which R d is 0, 1 or 2, Y alkyl and alkyl* are each, independently of one another, a straight-chain or branched alkyl radical having from 2 to 8 carbon atoms, alkenyl and alkenyl* are each, independently of one another, a straight-chain or branched alkenyl radical having from 2 to 8 carbon atoms.