Method of production of particulate polymers
    1.
    发明授权
    Method of production of particulate polymers 失效
    颗粒聚合物的生产方法

    公开(公告)号:US06239224B1

    公开(公告)日:2001-05-29

    申请号:US09072859

    申请日:1998-05-05

    IPC分类号: C08F25700

    摘要: The invention provides a process for the preparation of a particulate polymer having a mode particle size of at least 200 &mgr;m, the improvement comprising the use of substantially monodisperse polymeric particles as polymerization seeds in a suspension polymerization preparation of said particulate polymer.

    摘要翻译: 本发明提供了一种制备模粒径至少为200μm的颗粒聚合物的方法,其改进包括在所述颗粒聚合物的悬浮聚合制备中使用基本上单分散的聚合物颗粒作为聚合种子。

    Preparation of polymer particles
    4.
    发明授权
    Preparation of polymer particles 失效
    聚合物颗粒的制备

    公开(公告)号:US06559217B1

    公开(公告)日:2003-05-06

    申请号:US09958414

    申请日:2001-10-09

    IPC分类号: C08J300

    摘要: The invention provides a process for the preparation of polymer particles having a mode particle size of at least 50 &mgr;m which process comprises (a) obtaining a first particulate polymer seed material having a mode particle diameter of no more than 50 &mgr;m; (b) using said first seed material, performing a suspension polymerization involving the steps: (i) forming an aqueous dispersion comprising a polymer seed material, an organic compound (e.g. a polymerization initiator) which has a molecular weight of less than 5000 Daltons and a water solubility of less than 10−2 g/L at 25° C., a stabilizer and optionally an organic solvent (e.g. acetone or a portion of the monomer mentioned below); (ii) allowing said organic compound to diffuse into the seed material to produce an activated seed material; and (iii) contacting said activated seed material with a monomer (e.g. styrene) and with a polymerization initiator and effecting suspension polymerization thereof and (c) optionally impregnating and/or heat treating and/or surface modifying the particulate product of step (b).

    摘要翻译: 本发明提供了一种制备模粒径至少为50μm的聚合物颗粒的方法,该方法包括(a)获得模式粒径不超过50μm的第一粒状聚合物种子材料; (b)使用所述第一种子材料,进行悬浮聚合,其包括以下步骤:(i)形成包含聚合物种子材料的水性分散体,分子量小于5000道尔顿的有机化合物(例如聚合引发剂)和 在25℃下水溶解度小于10-2g / L,稳定剂和任选的有机溶剂(例如丙酮或下述单体的一部分); (ii)允许所述有机化合物扩散到种子材料中以产生活化的种子材料; 和(iii)使所述活化的种子材料与单体(例如苯乙烯)和聚合引发剂接触并进行其悬浮聚合,和(c)任选地浸渍和/或热处理和/或表面改性步骤(b)的颗粒产物, 。