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    Process for preparing low molecular weight linear phosphonitrilic chloride oligomers
    2.
    发明公开
    Process for preparing low molecular weight linear phosphonitrilic chloride oligomers 失效
    一种用于生产具有低分子量的线性磷腈氯化物的低聚物过程。

    公开(公告)号：EP0008414A1

    公开(公告)日：1980-03-05

    申请号：EP79102883.0

    申请日：1979-08-09

    申请人： ETHYL CORPORATION

    发明人： Hornbaker, Edwin Dale ,  Li, Hsueh Ming

    IPC分类号： C01B21/098

    CPC分类号： C01B21/0986 ,  C01B21/098

    摘要： A two-stage process for the production of linear phosphonitrilic chloride oligomers is provided. In the first step, phosphorus trichloride (PCl 3 ) and chlorine are reacted in a suitable liquid reaction medium. In the second step PCl 3 , Cl 2 and NH 3 are concurrently fed into the medium white maintaining a temperature at 100°C to 140°C. The feeds of the reactants are controlled so that until the first half of the NH 3 has been reacted the molar ratio of PCl 3 :NH 3 (including the PCl 3 of the first step) is kept above two. Thereafter, the feeds are adjusted so that with respect to the total amount of ammonia, said molar ratio is between 1.2 and 1.5. Linear phosphonitrilic chloride oligomers having a number average degree of polymerization from 2 to 9 are produced in high yield.

    摘要翻译： 提供了一种用于生产线性磷腈氯化物低聚物的两阶段过程。 在第一步骤中，三氯化磷（PCL3）和氯进行反应在合适的液体反应介质中。 在第二步骤中的PCl 3，Cl 2和NH 3被馈送到介质兼直到NH 3的前半部分已经反应的摩尔比，而反应物进行控制，从而确实保持的在100℃至140℃的温度下进料 的PCl 3的：NH 3（包括第一步骤的的PCl 3）保持上述两个。 那里之后，进料调节成没有相对于氨的总量，所述摩尔比为1.2和1.5之间。 具有聚合的2至9的数均度线性磷腈氯化物的低聚物在高的产率生产。

    Process for forming end-capped polyamic acids polyimides
    4.
    发明公开
    Process for forming end-capped polyamic acids polyimides 失效
    多发性维生素多聚物。

    公开(公告)号：EP0399558A2

    公开(公告)日：1990-11-28

    申请号：EP90109992.9

    申请日：1990-05-25

    申请人： ETHYL CORPORATION

    发明人： Lee, Burnell ,  Li, Hsueh Ming

    IPC分类号： C08G73/14

    CPC分类号： C08G73/1014 ,  C08G73/105 ,  C08G73/1064 ,  C08G73/1067

    摘要： This invention discloses a process where a portion of an amine terminated polyamic acid intermediate is end-capped with an aromatic monoanhydride additionally substituted with a free carboxylic acid or ester thereof. The polyamic acids of this invention are readily converted to high molecular weight polyimides which may contain a small amount of amide groups.

    摘要翻译： 本发明公开了一种方法，其中一部分胺封端的聚酰胺酸中间体用另外被游离羧酸或其酯取代的芳族单酸酐封端。 本发明的聚酰胺酸容易转化为可含有少量酰胺基团的高分子量聚酰亚胺。