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    • 7. 发明申请
    • Process for the manufacture of thermally stable PVDF
    • 用于制造热稳定PVDF的工艺
    • US20040225095A1
    • 2004-11-11
    • US10791226
    • 2004-03-02
    • Patrick KapplerVeronique Gauthe
    • C08F116/12
    • C08K5/098C08F14/22C08K5/42C08F2/16C08L27/16
    • The present invention relates to a process for the manufacture of PVDF homopolymer or copolymer by radical polymerization of vinylidene fluoride (VDF), and optionally of a comonomer, in aqueous dispersion and in the presence of a transfer agent, of a persulphate as radical initiator, optionally of a surface-active additive and optionally of a paraffin wax, in which: a) sodium acetate is added, either at the start of or during or after the polymerization, b) a potassium alkylsulphonate is optionally added after the polymerization, c) an aqueous PVDF dispersion is obtained, d) the PVDF is collected by atomizing the dispersion obtained in c) with air at a temperature of between 120 and 220null C., the aqueous dispersion obtained in c) not being washed with water before atomizing.
    • 本发明涉及通过偏二氟乙烯(VDF)和任选的共聚单体在水分散体中和在转移剂的存在下通过过氧化氢作为自由基引发剂的自由基聚合制备PVDF均聚物或共聚物的方法, 任选的表面活性添加剂和任选的石蜡,其中:a)在聚合开始或聚合期间或之后加入乙酸钠,b)在聚合后任选地加入烷基磺酸钾,c) 得到水性PVDF分散体,d)通过在空气中在120-220℃的温度下雾化c)中得到的分散体来收集PVDF,c)中得到的水分散体在雾化之前不被水洗涤。