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14 条记录 (耗时 0.019 秒)

    Cholesteric liquid crystal polyester
    2.
    发明授权
    Cholesteric liquid crystal polyester 失效
    胆固醇液晶聚酯

    公开(公告)号：US4891418A

    公开(公告)日：1990-01-02

    申请号：US240952

    申请日：1988-09-06

    申请人： Hajime Hara ,  Tomohiro Toya ,  Shigeki Iida ,  Tetsuo Satoh

    发明人： Hajime Hara ,  Tomohiro Toya ,  Shigeki Iida ,  Tetsuo Satoh

    IPC分类号： C08G63/60 ,  C09K19/38

    CPC分类号： C08G63/60 ,  C09K19/3809

    摘要： A cholesteric liquid crystal polyester comprising the following structural units (A), (B) and (C): ##STR1## wherein Ar.sup.1 and Ar.sup.2 represent each independently a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, of which one or more hydrogen atoms may be substituted by one or more halogen atoms, alkyl or alkoxy groups having 1 to 4 carbon atoms, provided that at least 60 mol % of Ar.sup.1 in the polymer is constituted by at least one group selected from 1,4-phenyl group, 2,6-naphthyl group and 4,4'-biphenyl group.

    Cholesteric liquid crystal copolyesters
    5.
    发明授权
    Cholesteric liquid crystal copolyesters 失效
    胆甾型液晶共聚酯

    公开(公告)号：US4698397A

    公开(公告)日：1987-10-06

    申请号：US901660

    申请日：1986-08-28

    申请人： Tomohiro Toya ,  Hajime Hara ,  Shigeki Iida ,  Tetsuo Satoh

    发明人： Tomohiro Toya ,  Hajime Hara ,  Shigeki Iida ,  Tetsuo Satoh

    IPC分类号： C08G63/00 ,  C08G63/60 ,  C08G63/78 ,  C09K19/38 ,  C08G63/76

    CPC分类号： C08G63/60 ,  C09K19/3809

    摘要： A process for preparing a cholesteric liquid crystal copolyester consisting essentially of structural units represented by the following formula (A), (B), (C) and (D): ##STR1## which is optically active characterized in that a polyethylene terephthalate oligomer having a (B)/(A) mole ratio in the range of 1.1 to 1.8, p-acetoxybenzoic acid and 3-methyladipic acid are reacted to prepare the final cholesteric liquid crystal copolyester having an inherent viscosity of at least 0.4 dl/g.

    摘要翻译： 一种制备基本上由下式（A），（B），（C）和（D）表示的结构单元组成的胆甾醇型液晶共聚酯的方法：（A）OCH 2 CH 2 O（B） ）光学活性的（D），其特征在于使（B）/（A）摩尔比为1.1〜1.8的聚对苯二甲酸乙二醇酯低聚物，对乙酰氧基苯甲酸和3-甲基己二酸进行反应，制备 最终的胆固醇液晶共聚酯的特性粘度至少为0.4dl / g。

    Wholly aromatic polyesters
    10.
    发明授权
    Wholly aromatic polyesters 失效
    全芳香族聚酯

    公开(公告)号：US4999416A

    公开(公告)日：1991-03-12

    申请号：US467383

    申请日：1990-01-19

    申请人： Tadahiro Kaminade ,  Shigeki Iida ,  Tomohiro Toya ,  Hajime Hara

    发明人： Tadahiro Kaminade ,  Shigeki Iida ,  Tomohiro Toya ,  Hajime Hara

    IPC分类号： C08G63/688 ,  C08G63/60 ,  C08G63/66

    CPC分类号： C08G63/605

    摘要： Provided is a wholly aromatic polyester superior in melt processability and tenacity which consists essentially of the following structural units (A), (B) and (C) and wherein 0.2 to 40 mole % of the total of said units are of ortho configuration; ##STR1## where Ar.sup.1 and Ar.sup.2 each represent a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, the hydrogen atoms of said aromatic hydrocarbon group may be substituted with a halogen atom, an alkyl or alkoxy group having 1 to 4 carbon atoms, or phenyl; Z is ##STR2## --O--, or --SO.sub.2 --; m is 0 or 1, at least 60 mole % of Ar.sup.1 being constituted by a group selected from 1,4-phenylene, substituted 1,4-phenylenes, naphthyl and 4,4'-biphenyl.