Process for the preparation of aromatic polyethersulphones
    32.
    发明授权
    Process for the preparation of aromatic polyethersulphones 失效
    制备芳香族聚醚砜的方法

    公开(公告)号:US5047496A

    公开(公告)日:1991-09-10

    申请号:US365304

    申请日:1989-06-13

    IPC分类号: C08G75/00 C08G75/23

    CPC分类号: C08G75/23

    摘要: This invention relates to a process for the preparation of high molecular weight aromatic polyethersulphones from diphenols and dihalogenoaryls, characterized in that N-alkylated acid amides are used as solvents and at the same time for the azeotropic removal of the water of reaction.

    摘要翻译: 本发明涉及从二酚和二卤代芳基制备高分子量芳族聚醚砜的方法,其特征在于N-烷基化酰胺作为溶剂,同时用于共沸除去反应水。

    Process for recovering thermoplastic polymers from dispersion
    36.
    发明授权
    Process for recovering thermoplastic polymers from dispersion 失效
    从分散体中回收热塑性聚合物的方法

    公开(公告)号:US4960864A

    公开(公告)日:1990-10-02

    申请号:US358954

    申请日:1989-05-30

    CPC分类号: C08F6/16

    摘要: Recovery of thermoplastic polymer solids from dispersions thereof by coagulation and subsequent washing of the solids is improved by contacting the polymer in the coagulation stage or the washing stage or in both stages with at least one tricarboxylic acid of the formula ##STR1## wherein X is a single covalent bond, --CH.sub.2 -- or --C.sub.2 H.sub.4 -- and R is H, --OH or ##STR2##

    摘要翻译: 通过凝结和随后的固体洗涤从其分散体中回收热塑性聚合物固体,通过使聚合物在凝固阶段或洗涤阶段或两个阶段中与至少一种下式的三羧酸接触,其中X为 单共价键,-CH 2 - 或-C 2 H 4 - ,并且R为H,-OH或