| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for reducing the fluoroether carboxylic acid or salt content of fluoropolymer dispersion.SOLUTION: The process for reducing the fluoroether carboxylic acid or salt content of aqueous fluoropolymer dispersion is provided, the fluoroether carboxylic acid or salt employed comprising fluoroether carboxylic acid or salt having the formula as follows: [R-O-L-COO]Y. The process includes: adding stabilizer to the fluoropolymer dispersion to form a stabilized aqueous fluoropolymer dispersion; heating the stabilized aqueous fluoropolymer dispersion to decarboxylate the fluoroether carboxylic acid or salt to produce a fluoroether byproduct; and removing at least a portion of the fluoroether byproduct. (In the formula, Ris 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.) |
