Patent ID: 6635190
Filing Date: 2003-10-21
Classification: 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 or an alkyl, alkoxy, alkenyl or alkenyloxy radical having 1 to 15 carbon atoms, and, simultaneously, one or more compounds of the formula IIA and/or one or more compounds of the formula IIB: in whichRâ€² is an alkyl or alkoxy radical having 1 to 10 carbon atoms or alkenyl having 2 to 10 carbon atoms, Y is F, Cl, a halogenated alkyl radical having 1 to 5 carbon atoms, in which, optionally, one CH2 group is replaced by â€”Oâ€” or â€”CH&boxH;CHâ€”, in whichRâ€³ and Râ€²â€³, independently of one another, are an alkyl or alkoxy radical having 1 to 10 carbon atoms or an alkenyl radical having 2 to 10 carbon atoms, and L is H or F, and, simultaneously, one or more compounds of the formulae IIIâ€² to Xâ€²: in which the individual radicals have the following meanings:R0: n-alkyl, oxaalkyl, fluoroalkyl or alkenyl, each having 1 to 9 carbon atoms, Z0: â€”C2H4â€”, â€”C2F4â€”, â€”CF&boxH;CFâ€”, â€”CF2Oâ€”, â€”OCF2â€”, â€”CH2Oâ€” or â€”OCH2â€”, Y3 and Y4: simultaneously H or F, and r: 0 or 1.