Patent ID: 6541082
Filing Date: 2003-04-01
Classification: C09K

Abstract:
A liquid-crystalline medium comprising a mixture of polar compounds having positive dielectric anisotropy, including at least one compound of formula I in whichR1 and R2 are each independently, H, an alkyl or alkenyl radical having up 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 is 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€”Oâ€” in such a way that O atoms are not linked directly to one another, said medium additionally comprising at least one compound of formulae II, III, IV, V, VI, VII or VIII: whereinR0 is n-alkyl, oxaalkyl, fluoroalkyl alkenyl, in each case having up to 7 carbon atoms, X0 is F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 carbon atoms, Y1, Y2, Y3 and Y4 are each, independently of one another, H or F, Z0 is â€”C4H8â€”, â€”CH2Oâ€”, â€”OCH2â€”, â€”CF&boxH;CFâ€”, â€”CF2Oâ€”, â€”OCF2â€” or â€”C2F4â€”, and r is 0 or 1.