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    Liquid crystal composition
    3.
    发明授权
    Liquid crystal composition 失效
    液晶组合物

    公开(公告)号：US5114614A

    公开(公告)日：1992-05-19

    申请号：US231527

    申请日：1988-08-12

    申请人： Naoyoshi Emoto ,  Hideo Saito ,  Kenji Furukawa

    发明人： Naoyoshi Emoto ,  Hideo Saito ,  Kenji Furukawa

    IPC分类号： C09K19/02 ,  C09K19/58

    CPC分类号： C09K19/586 ,  C09K19/0208 ,  A61M2202/046

    摘要： 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 specificed compound (I) containing a plurality of benzene, cyclohexane, dioxane, pyrimidine or/and pyridine ring and also having an optically active terminal group ##STR1## (R.sup.1 : alkyl); and further a nematic composition having a nearly constant twistability with temperature rise is provided, which composition comprises the above compound (I), 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 ##STR2## (W: a specified group, S: 0-4, and R.sup.5 : alkyl).

    Liquid crystal composition
    4.
    发明授权
    Liquid crystal composition 失效
    液晶组成

    公开(公告)号：US4780240A

    公开(公告)日：1988-10-25

    申请号：US890653

    申请日：1986-07-30

    申请人： Naoyoshi Emoto ,  Hideo Saito ,  Kenji Furukawa

    发明人： Naoyoshi Emoto ,  Hideo Saito ,  Kenji Furukawa

    IPC分类号： C09K19/02 ,  C09K19/58 ,  G02F1/13

    CPC分类号： C09K19/586 ,  C09K19/0208 ,  A61M2202/046

    摘要： 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 or/and pyridine ring and also having an optically active terminal group ##STR1## (R.sup.1 : alkyl); and further a nematic composition having a nearly constant twistability with temperature rise is provided, which composition comprises the above compound (I), 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 ##STR2## (W: a specified group, S: 0-4, and R.sup.5 : alkyl).

    摘要翻译： 提供了具有随着温度升高的扭转性（即本征螺距的倒数）显着增加的向列液晶组合物，该组合物包含（i）以螺旋扭转意义相同的光学活性物质， 并且使向单体添加到向列化合物时引起的胆甾型相的扭转性的温度依赖性呈现正向，以及（ii）向列型液晶，该光学活性物质是指定的化合物（I ）含有多个苯，环己烷，二恶烷，嘧啶或吡啶环，并且还具有光学活性末端基团（R 1：烷基）; 另外提供了具有与温度升高几乎恒定的扭转性的向列组合物，该组合物包含上述化合物（I），具有与（I）相同的螺旋扭曲感的光学活性物质， 单向添加到向列型化合物和向列型液晶中的诱发胆固醇相的可扭曲性的依赖性，后者的光学活性物质是含有多个苯，环己烷二恶烷的特定化合物（II） 嘧啶或吡啶基并具有光学活性的末端基团（W：指定的基团，S：0-4和R5：烷基）。