Patent ID: 6506462
Filing Date: 2003-01-14
Classification: C07C,C09K

Abstract:
A liquid crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, which comprises one or more compounds of the formula I, in whichR is H, an alkyl or alkenyl radical having 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, one or more CH2 groups in these radicals optionally being replaced, in each case independently of one another, by â€”Oâ€”, â€”Sâ€”, â€ƒâ€”COâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€” or â€”Oâ€”COâ€”Oâ€” in such a way that O atoms are not linked directly to one another, Y is F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 carbon atoms, and L1 is H or F and one or more compounds of the formula in whichR0 is n-alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having 1 to 7 carbon atoms, X0 is F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 carbon atoms, and Y2 is H or F, provided that the medium contains no compounds of the formula wherein R, Y and L1 have the above given meanings and L2 is H or F.