Method for the continuous production of thermoplastic molding materials
    8.
    发明授权
    Method for the continuous production of thermoplastic molding materials 失效
    连续生产热塑性成型材料的方法

    公开(公告)号:US06399703B1

    公开(公告)日:2002-06-04

    申请号:US09582879

    申请日:2000-07-06

    IPC分类号: C08F29700

    摘要: A process for preparing impact-modified styrene polymers (HIPS) omprises anionic polymerization of styrene in the presence of a rubber in one or more polymerization reactors in succession. The rubber is prepared in solution in an immediately upstream process. The heat of polymerization is utilized to remove the solvent for the rubber, this solvent having a boiling point lower than those of styrene and ethylbenzene, from at least one of the polymerization reactors via distillation with distillative cooling, and the solvent is reintroduced into the process of rubber preparation.

    摘要翻译: 制备冲击改性苯乙烯聚合物(HIPS)的方法在连续的一个或多个聚合反应器中在橡胶存在下进行苯乙烯的阴离子聚合。 橡胶在紧密上游过程中在溶液中制备。 使用聚合热来除去溶剂,该溶剂的沸点低于苯乙烯和乙苯的溶剂,来自至少一个聚合反应器通过蒸馏蒸馏冷却,并将溶剂重新引入该方法 的橡胶制剂。

    Preparation of polystyrene by continuous anionic polymerization
    10.
    发明授权
    Preparation of polystyrene by continuous anionic polymerization 失效
    通过连续阴离子聚合制备聚苯乙烯

    公开(公告)号:US5902865A

    公开(公告)日:1999-05-11

    申请号:US851353

    申请日:1997-05-06

    摘要: In a process for preparing polystyrene by continuous anionic polymerization of styrene monomer by means of a catalyst based on a metal alkyl preferably in the presence of a solvent at a temperature in the range from 30 to 70.degree. C., the styrene monomer is fed to an essentially isothermally operated circulation reactor configured as a closed tube loop which has, for example, a specific cooling area of at least 50 m.sup.2 per m.sup.3 of reactor volume, with the circulation velocity of the reaction mixture and the residence time being set such that the monomer conversion reaches at least 50% and the polymerization is completed in an essentially backmixing-free tube reactor.

    摘要翻译: 在通过苯乙烯单体通过基于金属烷基的催化剂的连续阴离子聚合制备聚苯乙烯的方法中,优选在溶剂存在下,在30至70℃的温度下,将苯乙烯单体进料至 基本上是等温操作的循环反应器,其构造为封闭管回路,其具有例如每立方米反应器体积至少50m 2的比冷却面积,反应混合物的循环速度和停留时间被设定为使得 单体转化率达到至少50%,并且在基本上无回混的管式反应器中完成聚合。