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Mesomorphic compound, liquid crystal composition containing the compound, liquid crystal device using the composition, liquid crystal apparatus and display method

  • US 5,653,913 A
  • Filed: 04/05/1996
  • Issued: 08/05/1997
  • Est. Priority Date: 08/31/1993
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal composition, said liquid crystal composition having a chiral smectic phase and comprising at least two different compounds, at least one of which is a mesomorphic compound represented by the following formula (I):

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    space="preserve" listing-type="equation">C.sub.m H.sub.2m+1 O(CH.sub.2).sub.n -(CF.sub.2).sub.p -(CH.sub.2).sub.q --Y.sup.1 --A.sup.1 --R.sup.1 (I)wherein R1 denotes H, halogen, CN, or a linear or branched alkyl group having 1-30 carbon atoms or cyclized alkyl group having at most 6 carbon atoms, said alkyl group being capable of including at least one --CH2 -- group which can be replaced with --O--, --S--, --CO--, --CH(Cl)--, --CH(CN)--, --CCH3 (CN)--, --CH═

    CH-- or --C≡

    C-- provided that heteroatoms are not adjacent to each other and capable of including at least one H which can be replaced with F;

    m, n, p and q independently denote an integer of 1-16 provided that m+n+p+q≦

    19;

    Y1 denotes a single bond, --O--, --CO--, --COO--, --OCO--, --CH═

    CH-- or --C≡

    C--;

    A1 denotes --A2 --, --A2 --X1 --A3 -- or --A2 --X1 --A3 --X2 --A4 in whichA2, A3 and A4 independently denote a divalent cyclic group selected from 1,4-phenylene capable of having one or two substituents comprising F, Cl, Br, CH3, CF3 or CN;

    pyridine-2,5-diyl;

    pyrimidine-2,5-diyl;

    pyrazine-2,5-diyl;

    pyridazine-3,6-diyl;

    1,4-cyclohexylene;

    1,3-dioxane-2,5-diyl;

    1,3-dithiane-2,5-diyl;

    thiophene-2,5-diyl;

    thiazole-2,5-diyl;

    thiadiazole-2,5-diyl;

    benzoxazole-2,5-diyl;

    benzoxazole-2,6-diyl;

    benzothiazole-2,5-diyl;

    benzothiazole-2,6-diyl;

    quinoxaline-2,6-diyl;

    quinoline-2,6-diyl;

    2,6-naphthylene;

    indan-2,5-diyl;

    2-alkylindan-2,5-diyl having a linear or branched alkyl group having 1-18 carbon atoms;

    indanone-2,6-diyl;

    2-alkylindanone-2,6-diyl having a linear or branched alkyl group having 1-18 carbon atoms;

    coumaran-2,5-diyl; and

    2-alkylcoumaran-2,5-diyl having a linear or branched alkyl group having 1-18 carbon atoms; and

    Xl and X2 independently denote a single bond --COO--, --OCO--, --CH2 O--, --OCH2 --, --CH2 CH2 --, --CH═

    CH-- or --C≡

    C.

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