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    • 8. 发明授权
    • Process for reducing the amount of fluorinated surfactant in aqueous fluoropolymer dispersions
    • 用于降低含氟聚合物水分散体中氟化表面活性剂的量的方法
    • US06825250B2
    • 2004-11-30
    • US10429387
    • 2003-05-05
    • Rebekka EpschKlaus HintzerGernot LöhrWerner Schwertfeger
    • Rebekka EpschKlaus HintzerGernot LöhrWerner Schwertfeger
    • C08L100
    • C08F6/16C08F6/20C08L27/12
    • The present invention provides a process of reducing the amount of fluorinated emulsifier in an aqueous fluoropolymer dispersion by contacting the aqueous fluoropolymer dispersion with an anion exchange resin in a non-fixed resin bed, the process comprising: (a) mixing the aqueous fluoropolymer dispersion with an effective amount of a surfactant so as to stabilize the fluoropolymer dispersion while being contacted with the anion exchange resin; (b) contacting the aqueous fluoropolyrner dispersion with an anion exchange resin by agitating the aqueous fluoropolymer dispersion with an effective amount of anion exchange resin for a time of less than 4 hours to reduce the amount of fluorinated emulsifier in the aqueous fluoropolymer dispersion to a desired level; and (c) separating the anion exchange resin from the aqueous fluoropolymer dispersion.
    • 本发明提供一种通过使含氟聚合物含水分散体与阴离子交换树脂在非固定树脂床中接触来降低含氟聚合物水分散体含量的方法,该方法包括:(a)将含氟聚合物水分散体与 有效量的表面活性剂,以便在与阴离子交换树脂接触的同时稳定含氟聚合物分散体;(b)通过用有效量的阴离子交换树脂搅拌含氟聚合物水分散体使其与阴离子交换树脂接触, 少于4小时的时间将含氟聚合物水分散体中的氟化乳化剂的量减少到所需水平; 和(c)从含氟聚合物含水分散体中分离阴离子交换树脂。