Patent ID: 6793983
Filing Date: 2004-09-21
Classification: C09K

Abstract:
Liquid-crystalline medium comprising a mixture of polar compounds of positive dielectric anisotropy, wherein the medium comprises one or more compounds of 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, where one or more CH2 groups in these radicals are optionally, in each case independently of one another, replaced by â€”Oâ€”, â€”Sâ€”, â€ƒâ€”COâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€” or â€”Oâ€”COâ€”O in such a way that O atoms arc not linked directly to one another, â€ƒis a trans-1,4-cyclohexylene ring, in which one or two CH2 groups are optionally replaced by â€”Oâ€” and/or â€”Sâ€”, or a cyclohexenylene ring, Y is halogenated alkyl, halogenated alkenyl, or halogenated alkoxy having 1 to 6 carbon atoms, Z is â€”CH2Oâ€”, â€”OCH2â€”, â€”CH2CH2â€”, â€”CH&boxH;CH â€”, â€”CF2O â€”, â€”OCF2â€”, â€”C2F4â€” or a single bond, and n is 1 or 2, and the medium comprises one or more compounds of the formula â€ƒin which R0: n-alkyl, oxoalkyl, fluoroalkyl or alkenyl, in each case having 1 to 7 carbon atoms; X0: F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 carbon atoms; and Y2: H or F.