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38 条记录 (耗时 0.03 秒)

    Process for the continuous production of polyamides
    24.
    发明授权
    Process for the continuous production of polyamides 失效
    聚酰胺连续生产工艺

    公开(公告)号：US4465821A

    公开(公告)日：1984-08-14

    申请号：US504666

    申请日：1983-06-15

    申请人： Werner Nielinger ,  Wolfgang Alewelt ,  Karl H. Hermann

    发明人： Werner Nielinger ,  Wolfgang Alewelt ,  Karl H. Hermann

    IPC分类号： C08G69/00 ,  C08G69/28 ,  C08G69/26

    CPC分类号： C08G69/28

    摘要： A process for the production of polyamides by the polycondensation of aqueous solutions of salts of diamines and dicarboxylic acids by continuously introducing the aqueous salt solution into a precondensate melt under atmospheric pressure and simultaneously distilling off the water and maintaining the temperature of the melt at a minimum temperature of 180.degree. C.

    摘要翻译： 通过在大气压下将含水盐溶液连续地引入预缩合的熔体中并同时蒸馏掉水并将熔体的温度保持在最低水平，通过二胺和二羧酸的盐的水溶液的缩聚来生产聚酰胺的方法 温度180℃

    Production and use of polyester carbonates
    25.
    发明授权
    Production and use of polyester carbonates 失效

    公开(公告)号：US06646099B2

    公开(公告)日：2003-11-11

    申请号：US10180351

    申请日：2002-06-26

    申请人： Silke Kratschmer ,  Lothar Bunzel ,  Wolfgang Alewelt ,  Renate Wilms

    发明人： Silke Kratschmer ,  Lothar Bunzel ,  Wolfgang Alewelt ,  Renate Wilms

    IPC分类号： C08G6400

    CPC分类号： C08G63/64

    摘要： A transesterification process for producing polyester is disclosed. In a first stage of the process there is heated, in an inert gas atmosphere, a first mixture containing at least one dihydroxy compound and at least one diaryl carbonate to form an oligocondensate. In a second stage there is added to the oligocondensate at least one dicarboxylic acid to form a second mixture. The second mixture is heated to a temperature not higher than 290° C. in the presence of a quaternary onium compound as catalyst to form polyester carbonate. Hydroxyaryl formed throughout the process is distilled-off under reduced pressure.

    Improved transesterification process for the production of polycarbonates
    26.
    发明授权
    Improved transesterification process for the production of polycarbonates 失效
    改进的用于生产聚碳酸酯的酯交换方法

    公开(公告)号：US5444148A

    公开(公告)日：1995-08-22

    申请号：US155391

    申请日：1993-11-19

    申请人： Wolfgang Alewelt ,  Steffen Kuhling ,  Hermann Kauth

    发明人： Wolfgang Alewelt ,  Steffen Kuhling ,  Hermann Kauth

    IPC分类号： C08G64/20 ,  C08G64/30 ,  C08G64/00

    CPC分类号： C08G64/307 ,  Y02P20/582

    摘要： An improvement to the transesterification process for the production of aromatic polycarbonates is disclosed. Into the melt which contains diphenols, carbonic acid diaryl esters and optionally branching agents and at temperatures of 130.degree. C. to 400.degree. C. and in the presence of catalysts there is mixed or passing thereover inert gas in a quantity of at least 0.5 Nm3 per kg of polycarbonate melt.

    摘要翻译： 公开了用于生产芳族聚碳酸酯的酯交换方法的改进。 在含有二酚，碳酸二芳基酯和任选的支化剂的熔体中，在130℃至400℃的温度下，在催化剂存在下，混合或通过至少为0.5Nm 3的量的惰性气体 每公斤聚碳酸酯熔体。