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    • 5. 发明公开
    • Liquid crystal composition
    • 液晶组合物
    • EP0211646A3
    • 1989-05-31
    • EP86306007.5
    • 1986-08-04
    • Chisso Corporation
    • Emoto, NaoyoshiSaito, HideoFurukawa, Kenji
    • C09K19/02C09K19/30C09K19/34C09K19/20C09K19/12C09K19/42C09K19/58
    • C09K19/586A61M2202/046C09K19/0208A61M2202/0057
    • A nematic liquid crystal composition having a notable increase of the twistability (i.e. the reciprocal of the intrinsic helical pitch) with temperature rise is provided, which composition comprises (i) optically active substance(s) which are the same in the helical twist sense to one another and make positive the temperature dependency of the twistability of the cholesteric phase induced when singly added to nematic compound(s), and (ii) nematic liquid crystal(s), which optically active substance(s) are a specified compound (I) containing a plurality of benzene, cyclohexane, dioxane, pyrimidine ori and pyridine ring and also having an optically active terminal group
      (R I : alkyl); and further a nematic composition having a nearly constant twistability with temperature rise is provided, which composition comprises the above compound (1), optically active substance(s) which have the same helical twist sense as that of (I) and make negative the temperature dependency of the twistability of the induced cholesteric phase when singly added to nematic compound(s) and nematic liquid crystal(s), which latter optically active substance(s) are a specified compound (II) containing a plurality of benzene, cyclohexane dioxane, pyrimidine or/and pyridine group and having an optically active terminal group
      (W: a specified group, S: 0 - 4, and R 5 : alkyl).
    • 本发明提供一种向列型液晶组合物,其具有随温度升高而显着增加的可扭曲性(即固有螺旋节距的倒数),所述组合物包含(i)螺旋扭曲相同的光学活性物质 并且使单独添加到向列型化合物中时引起的胆甾醇相的扭曲性与(ii)向列型液晶的光学活性物质为特定化合物(I) ),其含有多个苯,环己烷,二氧杂环己烷,嘧啶ori和吡啶环并且还具有光学活性端基(RI:烷基); 进一步提供具有与温度上升几乎不变的扭曲性的向列型组合物,该组合物包含上述化合物(1),具有与(I)相同的螺旋扭曲感的光学活性物质,并使温度 当单独加入到一种或多种向列型化合物和向列型液晶时,诱导的胆甾醇相的扭曲性依赖于后一种旋光物质是特定的含有多个苯的化合物(II),环己烷二恶烷, 嘧啶或/和吡啶基团并且具有光学活性末端基团(W:特定基团,S:0-4和R5:烷基)。