Patent ID: 6497828
Filing Date: 2002-12-24
Classification: C09K

Abstract:
A nematic liquid-crystal composition comprising at least one compound of the formula Ia in whichR1 and R2, are each independently alkenyl having 2 to 8 carbon atoms, and Z2 is a single bond, â€”(CH2)2â€” or trans-CH&boxH;CHâ€”, and at least one compound of the formula I in whichR1 and R2, are each independently alkenyl having 2 to 8 carbon atoms, each Z3 and Z4, is independently a single bond, â€”(CH2)2â€” â€”COOâ€”, â€”OCOâ€”, trans-CH&boxH;CHâ€”, â€”CH2Oâ€” or â€”OCH2â€”, each A1, A2 and A3, is independently trans-1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexenylene, in which also one or two nonadjacent CH2 groups may be replaced by oxygen, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene 1,5-pyridyl or 1,5-pyrimidyl, in which one or two H atoms are optionally replaced by F, and n is 0, 1 or 2, with the proviso that the compounds of formula Ia and I are not the same.