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    • 11. 发明授权
    • Aqueous dispersions of polytetrafluoroethylene having a low amount of fluorinated surfactant
    • 具有少量氟化表面活性剂的聚四氟乙烯的水分散体
    • US07041728B2
    • 2006-05-09
    • US10962633
    • 2004-10-12
    • Tilman ZippliesKlaus HintzerMichael C. DadalasGernot Loehr
    • Tilman ZippliesKlaus HintzerMichael C. DadalasGernot Loehr
    • C08L27/12D06M15/277
    • C09D127/18C08F6/16C08F214/26C08L27/18C08L71/02C08L2666/02C08L2666/22
    • The present invention provides a method of making an aqueous dispersion of non-melt processible polytetrafluoroethylene, the method comprising:(a) an aqueous emulsion polymerization of an amount of tetrafluoroethylene to produce a final amount of polytetrafluoroethylene solids and optionally up to 1% by weight based on the amount of tetrafluoroethylene of a perfluorinated comonomer, wherein said aqueous emulsion polymerization is initiated with a free radical initiator and the polymerization is carried out in the presence of a fluorinated surfactant, and wherein before completing the feeding of said amount of tetrafluoroethylene but after feeding at least 80% by weight of said amount of tetrafluoroethylene, free radicals capable of introducing ionic end groups or precursors thereof in the polytetrafluoroethylene polymer are caused to be formed at a rate that without counter measures would cause an increase in the polymerization rate of at least 20%;(b) reducing the amount of fluorinated surfactant in the thus obtained aqueous dispersion to an amount of not more than 200 ppm, preferably not more than 100 ppm and more preferably not more than 50 ppm based on the amount of polytetrafluoroethylene solids. The invention further provides an aqueous dispersion of polytetrafluoroethylene particles and the use thereof in coating a substrate.
    • 本发明提供了一种制备不熔融可加工聚四氟乙烯的水性分散体的方法,该方法包括:(a)一定量的四氟乙烯的水乳液聚合以产生最终量的聚四氟乙烯固体,并且任选地高达1重量% 基于全氟化共聚单体的四氟乙烯的量,其中所述水性乳液聚合由自由基引发剂引发,并且聚合在氟化表面活性剂的存在下进行,并且其中在完成所述量的四氟乙烯之前但在 加入至少80重量%的所述量的四氟乙烯,使得能够在聚四氟乙烯聚合物中引入离子端基或其前体的自由基以不加对策的方式形成,导致聚四氟乙烯聚合速率的升高 至少20%; (b)将由此得到的水性分散体中的氟化表面活性剂的量减少到基于聚四氟乙烯固体量不超过200ppm,优选不超过100ppm,更优选不大于50ppm的量。 本发明还提供聚四氟乙烯颗粒的水分散体及其在涂布基材中的用途。