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6 条记录 (耗时 0.018 秒)

    Method for preparing norbornene and substituted derivatives of norbornene
    5.
    发明授权
    Method for preparing norbornene and substituted derivatives of norbornene 失效
    降冰片烯的降冰片烯和取代衍生物的制备方法

    公开(公告)号：US06294706B1

    公开(公告)日：2001-09-25

    申请号：US09142806

    申请日：1998-10-29

    申请人： Christer Bergström ,  Jukka Koskinen ,  Erkki Halme ,  Matti Lindström ,  Mika Perälä

    发明人： Christer Bergström ,  Jukka Koskinen ,  Erkki Halme ,  Matti Lindström ,  Mika Perälä

    IPC分类号： C07C250

    CPC分类号： C07C13/43 ,  C07C13/42 ,  C07C13/68 ,  C07C2602/42 ,  C07C2603/86

    摘要： Disclosed is a method for the preparation of norbornene and substituted norbornene compounds via a Diels-Alder reaction, in which a cyclic diene is reacted with an olefinic compound in order to prepare a norbornene compound. According to the invention a cyclic diene is gradually added to react with an olefinic compound, in order to keep the concentration of the cyclic diene in the reaction mixture as low as possible during the reaction. It is possible to obtain a very pure product, high yield, short reaction time and high concentrations of the exo diastereomer with the method of the invention.

    摘要翻译： 公开了通过Diels-Alder反应制备降冰片烯和取代的降冰片烯化合物的方法，其中环状二烯与烯属化合物反应以制备降冰片烯化合物。 根据本发明，逐渐加入环状二烯与烯烃化合物反应，以便使反应混合物中的环状二烯的浓度尽可能地低。 用本发明的方法可以获得非常纯的产物，高产率，短的反应时间和高浓度的非对映异构体。

    Method for the preparation of hollow polymer particle latex
    6.
    发明授权
    Method for the preparation of hollow polymer particle latex 失效
    中空聚合物颗粒胶乳的制备方法

    公开(公告)号：US06235810B1

    公开(公告)日：2001-05-22

    申请号：US09380543

    申请日：1999-11-22

    申请人： Valery Pavlyuchenko ,  Nina Byrdina ,  Sergey Ivanchev ,  Mikael Skrifvars ,  Erkki Halme ,  Hanna Laamanen ,  Jukka Koskinen

    发明人： Valery Pavlyuchenko ,  Nina Byrdina ,  Sergey Ivanchev ,  Mikael Skrifvars ,  Erkki Halme ,  Hanna Laamanen ,  Jukka Koskinen

    IPC分类号： C08F226

    CPC分类号： C08F285/00 ,  Y10S525/902

    摘要： A method for the preparation of latexes with hollow polymer particles useful as opacifying agents. The process comprises the preparation of hollow polymer particle latex by emulsion copolymerization with water soluble initiator and anionic surfactant as follows: a) preparation of seed latex of copolymer containing methyl methacrylate and methacrylic acid; b) preparation of latex of highly carboxylated copolymer containing methyl methacrylate and a cross-linking agent and optionally a vinyl aromatic compound; c) using highly carboxylated latex synthesized at stage b) in the preparation of the intermediate shell comprising a copolymer of methyl methacrylate, acrylic acid ester, a cross-linking agent and optionally vinyl aromatic compound, said intermediate shell copolymer having a glass transition temperature below 80° C.; d) swelling the particles prepared at stage c) by addition of volatile basic compound; e) preparation of a hard shell on the swollen expanded particles comprising a copolymer of vinyl aromatic compound, acrylonitrile and/or methyl methacrylate, and cross-linking agent, said hard shell having a glass transition temperature above 80° C.; and f) optional preparation of an external shell.

    摘要翻译： 一种制备具有中空聚合物颗粒的胶乳的方法，其可用作遮光剂。 该方法包括通过与水溶性引发剂和阴离子表面活性剂的乳液共聚制备中空聚合物颗粒胶乳：a）制备含有甲基丙烯酸甲酯和甲基丙烯酸的共聚物种子胶乳; b）制备含甲基丙烯酸甲酯和交联剂和任选的乙烯基芳族化合物的高度羧化共聚物的胶乳; c）使用在步骤b）中合成的高度羧化的胶乳来制备包含甲基丙烯酸甲酯，丙烯酸酯，交联剂和任选的乙烯基芳族化合物的共聚物的中间体壳，所述中间体壳共聚物的玻璃化转变温度低于 80℃。 d）通过加入挥发性碱性化合物使阶段c）中制备的颗粒膨胀; e）在包含乙烯基芳族化合物，丙烯腈和/或甲基丙烯酸甲酯的共聚物和交联剂的膨胀的膨胀颗粒上制备硬壳，所述硬壳的玻璃化转变温度高于80℃; 和f）可选地准备外壳。