| abstract |
Liquid-crystalline medium based on a mixture of polar compounds having a positive dielectric anisotropy, characterized in that it contains 15-50% by weight of one or more compounds of the formula I3 contains wherein R 1 is an unsubstituted, a simple by CN or CF 3 or at least one halogen-substituted alkyl radical having 1 to 12 carbon atoms, wherein in these radicals also one or more CH 2 groups each independently by -O-, -S - -CH = CH-, -C≡C-, -CO-, -CO-O-, -O-CO- or -O-CO-O- may be replaced so that O atoms are not directly linked to one another, means and additionally one or more compounds selected from the formulas in which the individual radicals have the following meanings: Alkyl: a straight-chain alkyl radical having 1-8 C atoms, R 0 : n-alkyl, oxaalkyl, fluoroalkyl or alkenyl, each having up to 9 C atoms, X 0 : F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 C atoms, Y 2 : H or F. |