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    • 9. 发明申请
    • Thermal Reduction of Fluoroether Carboxylic Acids or Salts from Fluoropolymer Dispersions
    • 含氟聚合物分散体中氟醚羧酸或盐的热还原
    • US20100286330A1
    • 2010-11-11
    • US12774030
    • 2010-05-05
    • David William JohnsonKenneth Scott Teter
    • David William JohnsonKenneth Scott Teter
    • C08L27/12
    • C08F6/16C08F14/18C08L27/12C08F2/20C08F2/16
    • A process for reducing the fluoroether carboxylic acid or salt content of aqueous fluoropolymer dispersion. The fluoroether carboxylic acid or salt employed comprises fluoroether carboxylic acid or salt having the formula below: [R1—O-L-COO−]Y+ wherein R1 is a linear, branched or cyclic partially or fully fluorinated aliphatic group which may contain ether linkages; L is a branched partially or fully fluorinated alkylene group which may contain ether linkages; and Y+ is hydrogen, ammonium or alkali metal cation. The process comprises adding stabilizer to the aqueous fluoropolymer dispersion to form a stabilized aqueous fluoropolymer dispersion and heating the stabilized aqueous fluoropolymer dispersion to decarboxylate the fluoroether carboxylic acid or salt to produce a fluoroether byproduct. At least a portion of the fluoroether byproduct is removed.
    • 降低氟代醚羧酸含量或含氟聚合物含水分散体的盐含量的方法。 所用的氟醚羧酸或其盐包括具有下式的氟醚羧酸或盐:[R 1 -O-L-COO-] Y +,其中R 1是可以含有醚键的直链,支链或环状的部分或完全氟化的脂族基团; L是可以含有醚键的支化部分或完全氟化的亚烷基; Y +是氢,铵或碱金属阳离子。 该方法包括向含氟聚合物含水分散体中加入稳定剂以形成稳定的含氟聚合物含水分散体,并加热稳定的含氟聚合物水分散体以使氟代醚羧酸或盐脱羧以产生氟醚副产物。 除去至少一部分氟醚副产物。