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    Aromatic diamine intermediates useful in the preparation of polyimides
    53.
    发明授权
    Aromatic diamine intermediates useful in the preparation of polyimides 失效
    用于制备聚酰亚胺的芳族二胺中间体

    公开(公告)号：US5354890A

    公开(公告)日：1994-10-11

    申请号：US80772

    申请日：1993-06-24

    申请人： Shoji Tamai ,  Wataru Yamashita ,  Yuichi Okawa ,  Yuko Ishihara ,  Keizaburo Yamaguchi ,  Akihiro Yamaguchi

    发明人： Shoji Tamai ,  Wataru Yamashita ,  Yuichi Okawa ,  Yuko Ishihara ,  Keizaburo Yamaguchi ,  Akihiro Yamaguchi

    IPC分类号： C07C225/22 ,  C08G73/10 ,  C08G73/14

    CPC分类号： C07C225/22 ,  C08G73/1014 ,  C08G73/1017 ,  C08G73/1039 ,  C08G73/1067 ,  C08G73/14

    摘要： A heat-resistant and thermoplastic polyimide which has low dielectric characteristics and recurring structural units of the following formula: ##STR1## wherein R is a tetravalent radical having from 2 to 27 carbon atoms and selected from the group consisting of an aliphatic radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected each other with a direct bond or a bridge member; aromatic diamines which are useful for the raw material monomers of the polyimide and have following formulas: ##STR2## and a process for preparing the polyimide of the above formula by reacting these aromatic diamines with a tetracarboxylic dianhydride in the presence of an aromatic dicarboxylic anhydride or aromatic monoamine, and successively thermally or chemically imidizing the resultant polyamic acid; are disclosed.

    摘要翻译： 具有低介电特性和具有下式的重复结构单元的耐热热塑性聚酰亚胺：其中R是具有2至27个碳原子并且选自脂族基团的四价基团 ，脂环族基团，单芳族基团，稠合多芳族基团和非缩合芳族基团彼此直接连接或桥接成员; 芳族二胺可用于聚酰亚胺的原料单体，具有以下分子式：＆lt; IMAGE＆gt;（IA）和＆lt; IMAGE＆gt;（IB）和通过使这些芳族二胺与四羧酸 二酐在芳族二羧酸酐或芳族单胺的存在下，并依次热或化学酰亚胺化所得聚酰胺酸; 被披露。

    Preparation of N-protected .alpha.-L-aspartyl-L-phenylalanine methyl ester
    54.
    发明授权
    Preparation of N-protected .alpha.-L-aspartyl-L-phenylalanine methyl ester 失效
    N-保护的α-L-天冬氨酰基-L-苯丙氨酸甲酯的制备

    公开(公告)号：US5302743A

    公开(公告)日：1994-04-12

    申请号：US823538

    申请日：1992-01-21

    申请人： Toshio Katoh ,  Chojiro Higuchi ,  Takeshi Oura ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    发明人： Toshio Katoh ,  Chojiro Higuchi ,  Takeshi Oura ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    IPC分类号： C07K5/075 ,  C07C229/00

    CPC分类号： C07K5/0613 ,  Y02P20/55

    摘要： Disclosed is an improved process for the preparation of an N-protected .alpha.-L-aspartyl-L-phenylalanine methyl ester from an N-protected L-aspartic anhydride and L-phenylalanine methyl ester, the improvement which comprises employing the L-phenylalanine methyl ester in the form of a mineral acid salt thereof and conducting the reaction either (a) in an organic solvent and in the presence of a salt of an organic carboxylic acid, or (b) in an organic solvent comprising an organic carboxylic acid and in the presence of at least one member of the group consisting of an alkali metal or an alkaline earth metal inorganic base, an ammonium alkali metal or alkaline earth metal salt of an organic carboxylic acid and ammonium carbonate. The starting N-protected aspartic anhydride, e.g., N-benzyloxycarbonyl-L-aspartic anhydride, can be produced by the reaction of N-protected aspartic acid with phosgene. When the N-protecting group sibenzyloxycarbonyl and the solvent is acetic acid, the desired product can be isolated from the reaction mixture in crystalline form in high purity by adding water thereto.

    摘要翻译： 公开了一种由N-保护的L-天冬氨酸酐和L-苯丙氨酸甲酯制备N-保护的α-L-天冬氨酰-L-苯丙氨酸甲酯的改进方法，其改进包括使用L-苯丙氨酸甲酯 酯，其为无机酸盐，并且在有机溶剂中和有机羧酸的盐存在下进行反应，或（b）在包含有机羧酸的有机溶剂中和 存在由碱金属或碱土金属无机碱组成的组中的至少一种，有机羧酸的铵碱金属或碱土金属盐和碳酸铵。 起始的N-保护的天冬氨酸酐，例如N-苄氧基羰基-L-天冬氨酸酐可以通过N-保护的天冬氨酸与光气的反应来制备。 当N-保护基团苄氧基羰基和溶剂为乙酸时，可以通过向其中加入水从所述反应混合物中以高纯度从结晶形式中分离所需产物。

    Recording material comprising crystal of fluoran compound
    56.
    发明授权
    Recording material comprising crystal of fluoran compound 失效
    包含荧烷化合物晶体的记录材料

    公开(公告)号：US5300473A

    公开(公告)日：1994-04-05

    申请号：US28911

    申请日：1993-03-08

    申请人： Masakatsu Nakatsuka ,  Atsuo Otsuji ,  Kiyoharu Hasegawa ,  Kazuyoshi Kikkawa ,  Akihiro Yamaguchi

    发明人： Masakatsu Nakatsuka ,  Atsuo Otsuji ,  Kiyoharu Hasegawa ,  Kazuyoshi Kikkawa ,  Akihiro Yamaguchi

    IPC分类号： B41M5/145 ,  B41M5/327 ,  C09B11/24 ,  C09B67/48 ,  B41M5/30 ,  B41M5/32

    CPC分类号： C09B67/0025 ,  B41M5/1455 ,  B41M5/3275 ,  C09B11/24

    摘要： Disclosed are a crystal of a fluoran compound having the formula comprising exhibiting high peaks at diffraction angles (2.theta.) of 7.5.degree. and 17.0.degree. and relatively high peaks at diffraction angles (2.theta.) of 15.1.degree., 19.1.degree., 21.5.degree. and 25.3.degree. in an X-ray diffraction diagram by the CU-K.alpha. beam and a crystal of a fluoran compound having the formula (II) comprising exhibiting high peaks at diffraction angles (2.theta.) of 5.5.degree. and 19.2.degree. in an X-ray diffraction diagram by the CU-K.alpha. beam, which is useful as a color forming compound in recording materials. ##STR1##

    摘要翻译： 公开了具有以下通式的荧烷化合物的晶体，其包括在7.5度和17.0度的衍射角（2（θ））处呈现高峰，并且在15.1度，19.1度的衍射角（2（θ））处具有相对高的峰， 通过CU-K（α）光束在X射线衍射图中为21.5度和25.3度，并且具有式（II）的荧烷化合物的晶体包括在5.5度的衍射角（2（θ））处表现出高峰 在通过CU-K（α）光束的X射线衍射图中为19.2度，其可用作记录材料中的成色化合物。 （*化学结构*）（I）（*化学结构*）（II）