Patent ID: 6677003
Filing Date: 2004-01-13
Classification: C09K

Abstract:
A liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, comprising one or more compounds of the formula I and one or more compounds of formula IA whereina, b, x and yare each, independently of one another, 0 to 10,v and ware each, independently of one another, 0 or 1,Ris a halogenated or unsubstituted alkyl radicalhaving up to 12 carbon atoms, where one ormore CH2 groups in these radicals may alsobe replaced, in each case independently of oneanother, by â€”CH&boxH;CHâ€”, â€”Câ‰¡Câ€”, â€”Oâ€”,â€”COâ€”Oâ€” or â€”Oâ€”COâ€” in such a way thatO atoms are not linked directly to one another,Xis F, Cl, CN, SF5, a halogenated alkyl radicalhaving up to 6 carbon atoms, a halogenatedalkenyl radical having up to 6 carbon atoms,a halogenated alkoxy radical having up to 6carbon atoms or a halogenated alkenyloxyradical having up to 6 carbon atoms,Yis CaH2a+1, CF3, OCF3, OCHF2,OCF2CHFCF3, SF5, F or Cl,Z1 and Z2are each, independently of one another,â€”CF2Oâ€” or a single bond, where Z1 â‰  Z2,  L1 and L2are each, independently of one another, H or F.