利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

146 条记录 (耗时 0.024 秒)

    Process for producing 1,3-bis(dicarboxyphenyl)-disiloxane derivative or dianhydride thereof
    1.
    发明授权
    Process for producing 1,3-bis(dicarboxyphenyl)-disiloxane derivative or dianhydride thereof 失效
    制备1,3-双（二羧基苯基） - 二硅氧烷衍生物或其二酐的方法

    公开(公告)号：US5166363A

    公开(公告)日：1992-11-24

    申请号：US803897

    申请日：1991-12-09

    申请人： Tohru Kikuchi ,  Toshiyuki Fujita ,  Koichi Kamijima ,  Takayuki Saito

    发明人： Tohru Kikuchi ,  Toshiyuki Fujita ,  Koichi Kamijima ,  Takayuki Saito

    IPC分类号： C07F7/08

    CPC分类号： C07F7/0874 ,  C07F7/0889

    摘要： A process for producing (i) a 1,3-bis(dicarboxyphenyl)disiloxane derivative represented by the general formula ##STR1## wherein Rs and R's independently of one another denote methyl or phenyl or (ii) a 1,3-bis(dicarboxyphenyl)-disiloxane derivative dianhydride represented by the general formula ##STR2## wherein Rs and R's are as defined above, the process comprising coupling a Grignard reagent of halo-o-xylene with a disubstituted halosilane represented by the general formula ##STR3## wherein R and R' are as defined above and X denotes halogen, to form a dimethylphenyl(disubstituted silane) represented by the general formula ##STR4## wherein R and R' are as defined above, hydroxylating the dimethylphenyl(disubstituted silane) to form a dimethylphenyl(disubstituted hydroxysilane) represented by the general formula ##STR5## wherein R and R' are as defined above, to form a 1,3-bis(dimethylphenyl)-disilanedehydrating-condensing the dimethylphenyl-(disubstituted hydroxysilane derivative represented by the general formula ##STR6## wherein Rs and R's are as defined above, and oxidizing the 1,3-bis(dimethylphenyl)disilane derivative to yield the intended 1,3-bis(dicarboxyphenyl)disiloxane derivative of general formula [V], orfurther comprising the dehydration ring closure of this product to form a 1,3-bis(dicarboxyphenyl)-disiloxane derivative dianhydride of general formula [VI], mixing the resulting isomeric mixture with an ether solvent, and recovering the formed precipitate to yield a white powder of the intended product of general formula [VI].

    摘要翻译： 一种制备（i）由通式[IMAGE] [V]表示的1,3-双（二羧基苯基）二硅氧烷衍生物的方法，其中R 5和R 6彼此独立地表示甲基或苯基，或（ii） 由通式Ⅵ[VI]表示的双（二羧基苯基） - 二硅氧烷衍生物二酐，其中R 5和R 8如上所定义，该方法包括将卤代邻二甲苯的格氏试剂与通式 其中R和R'如上所定义，X表示卤素，形成由通式[II]表示的二甲基苯基（二取代硅烷），其中R和R'如上定义，羟基化 二甲基苯基（二取代的硅烷）以形成由通式[IMAGE] [III]表示的二甲基苯基（二取代的羟基硅烷），其中R和R'如上所定义，以形成1,3-双（二甲基苯基） - 二硅烷脱水 - 缩合二甲基苯基 - （二取代的羟基 由通式[IMAGE] [Ⅳ]表示的哒嗪衍生物，其中R 5和R 8如上所定义，并氧化1,3-双（二甲基苯基）二硅烷衍生物，得到所需的1,3-双（二甲基苯基）二硅氧烷衍生物 或者进一步包括该产物的脱水闭环以形成通式[VI]的1,3-双（二羧基苯基） - 二硅氧烷衍生物二酐，将得到的异构体混合物与醚溶剂混合，并回收 形成的沉淀物得到通式[VI]的预期产物的白色粉末。

    Para- or meta-terphenyltetracarboxylic acid, dianhydride thereof and process for preparing the same
    4.
    发明授权
    Para- or meta-terphenyltetracarboxylic acid, dianhydride thereof and process for preparing the same 失效
    对 - 或间三联苯四甲酸，其二酐及其制备方法

    公开(公告)号：US4912233A

    公开(公告)日：1990-03-27

    申请号：US262220

    申请日：1988-10-21

    申请人： Tohru Kikuchi ,  Toshiyuki Fujita ,  Takayuki Saito

    发明人： Tohru Kikuchi ,  Toshiyuki Fujita ,  Takayuki Saito

    IPC分类号： C07C63/331

    CPC分类号： C07C63/331

    摘要： Disclosed are a para- or meta-terphenyl-3,4,3",4"-tetracarboxylic acid or a dianhydride and a process for preparing the same. The para- or meta-terphenyl-3,4,3",4"-tetracarboxylic acid or a dianhydride thereof according to the present invention is a novel compound which is useful as a raw material for a polyimide having higher heat resistance and so on.

    摘要翻译： 公开了对 - 或间 - 三联苯-3,4,3'，4“ - 四羧酸或二酐及其制备方法。 根据本发明的对 - 或间 - 三联苯-3,4,3'，4“ - 四羧酸或其二酐是一种新型化合物，其可用作具有较高耐热性的聚酰亚胺的原料， 所以。

    Phenolic polymer and production thereof
    6.
    发明授权
    Phenolic polymer and production thereof 失效
    酚醛聚合物及其生产

    公开(公告)号：US5102962A

    公开(公告)日：1992-04-07

    申请号：US499701

    申请日：1990-03-27

    申请人： Tohru Kikuchi ,  Hiroyuki Kawakami ,  Takayuki Saito

    发明人： Tohru Kikuchi ,  Hiroyuki Kawakami ,  Takayuki Saito

    IPC分类号： C07C37/16 ,  C08G61/02

    CPC分类号： C08G61/02 ,  C07C37/14 ,  C07C37/16

    摘要： A phenolic polymer obtained by reacting a phenolic compound with a bis(hydroxyalkyl)benzene, followed by alkylation of ortho positions or para position with respect to the hydroxyl group of the terminal phenol groups of the produced polymer is suitable for use as a heat resistant antioxidant for thermoplastic resins.

    摘要翻译： 通过使酚类化合物与双（羟烷基）苯反应，然后相对于所制备的聚合物的末端苯酚基团的羟基进行邻位烷基化或对位而获得的酚醛聚合物适合用作耐热抗氧化剂 用于热塑性树脂。

    Process for producing methacrylic acid esters
    8.
    发明授权
    Process for producing methacrylic acid esters 失效
    生产甲基丙烯酸酯的方法

    公开(公告)号：US5072027A

    公开(公告)日：1991-12-10

    申请号：US416993

    申请日：1989-10-04

    申请人： Akihiro Kobayashi ,  Toshio Akima ,  Takayuki Saito ,  Toshiyuki Fujita

    发明人： Akihiro Kobayashi ,  Toshio Akima ,  Takayuki Saito ,  Toshiyuki Fujita

    IPC分类号： C07C67/03

    CPC分类号： C07C67/03

    摘要： In a process for producing a methacrylic acid ester by subjecting methyl methacrylate and an alcohol to a transesterification reaction in the presence of a catalyst and a polymerization inhibitor, the filtration time of catalyst and the like can be shortened by making a total water content in the catalyst, alcohol and methyl methacrylate 1000 ppm or less, or the generation of large bubbles during the reaction can be prevented by adding the starting alcohol to the reaction system at the alcohol conversion of 40% or more, or high catalytic activity is obtained even if a secondary or tertiary alcohol is used as a starting material by using as a catalyst that obtained by drying lithium hydroxide monohydrate with heating, these effects being also obtained by combining individual conditions.

    摘要翻译： 在通过在催化剂和阻聚剂的存在下使甲基丙烯酸甲酯和醇进行酯交换反应来生产甲基丙烯酸酯的方法中，通过使催化剂等的总含水量可以缩短催化剂等的过滤时间 催化剂，醇和甲基丙烯酸甲酯1000ppm以下，或通过在醇转化率为40％以上时将起始醇加入到反应体系中，可以防止反应期间产生大的气泡，即使得到高催化活性，即使 通过使用通过加热将氢氧化锂一水合物干燥而获得的催化剂，可以使用仲醇或叔醇作为原料，这些效果也通过组合各个条件而获得。