| 摘要 |
PCT No. PCT/EP91/00156 Sec. 371 Date Apr. 10, 1991 Sec. 102(e) Date Apr. 10, 1991 PCT Filed Jan. 28, 1991 PCT Pub. No. WO91/12294 PCT Pub. Date Aug. 22, 1991.The invention relates to a liquid-crystalline mixture containing one or more compounds of the general formula <IMAGE> I in which R1 is straight-chain alkyl having 2 to 12 carbon atoms in which, in addition, one CH2 group may be replaced by -O- or -CH=CH-, the ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and r is 0 or 1, and one or more highly dielectrically positive compounds selected from the group comprising the compounds of the general formulae II, III and IV in a weight ratio between the compounds of the formula I and the compounds of the formulae II, III and IV of from 1:10 to 10:1: <IMAGE> II in which R2 has one of the meanings indicated for R1, and X and Y are each, independently of one another, CH or N, <IMAGE> III in which R2 has one of the meanings indicated for R1, and X' and Y' are CH2 or O, <IMAGE> IV in which R2 has one of the meanings indicated for R1, r is as defined above, the rings A1 and A2 have one of the meanings indicated for A, and L is H or F.
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