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    • 70. 发明公开
    • Process for preparing modified PTFE
    • Verfahren zur Herstellung von modifizierten PTFE
    • EP0931798A1
    • 1999-07-28
    • EP99100237.9
    • 1999-01-08
    • Ausimont S.p.A.
    • Kapeliouchko, ValeryMarchese, Enrico
    • C08F214/26
    • C08F214/262
    • Method for preparing modified PTFE by suspension, wherein as comonomers perfluoroalkylvinylethers in which the alkyl has from 1 to 5 carbon atoms, and/or a perfluorodioxole are used, characterized by the following conditions:

      a part of the comonomer, from 15 to 90% by weight of the total amount is to be fed at the beginning of the reaction; the remaining part of the comonomer is to be distributed during the reaction so as to obtain a constant speed of the comonomer incorporation in the polymer chain;
      a perfluorinated surfactant and a buffering salt are used;
      a persulphate with a reducing agent is used as initiator in such a ratio as to generate a part of the radicals from the redox reaction and another one from the persulphate thermal decomposition;
      one operates with a polymerization pressure from 15 to 30 bar.
    • 通过悬浮液制备改性PTFE的方法,其中使用其中烷基具有1至5个碳原子的共聚单体全氟烷基乙烯基醚和/或全氟二恶唑,其特征在于以下条件:一部分共聚单体为15至90% 总量的重量在反应开始时进料; 共聚单体的剩余部分在反应期间分布,以获得聚合物链中共聚单体引入的恒定速度; 使用全氟化表面活性剂和缓冲盐; 使用还原剂的过硫酸盐作为引发剂,其比例从氧化还原反应产生一部分自由基,另一种则来自过硫酸盐热分解; 一个聚合压力从15到30巴。