Fluoropolymer compositions and purification methods thereof

摘要

Described herein is a composition comprising an aqueous polymerization reaction product of fluorinated monomers and wherein the polymerization is initiated (i) in the absence of a fluorinated emulsifier and whereby no fluorinated emulsifier is added during polymerization or (ii) in the presence of an fluorinated emulsifier selected from: [Rf—O-L-COO-]i Xi+ (I) wherein L represents a linear or branched, non-fluorinated, partially fluorinated, or fully fluorinated alkylene group, Rf represents a linear or branched partially or fully fluorinated aliphatic group or a linear or branched partially or fully fluorinated aliphatic group interrupted with at least one oxygen atom, Xi+ represents a cation having the valence i and i is 1, 2 or 3; wherein the reaction product and/or the resulting aqueous phase are substantially free of di- and tri-alkylamines and substantially free of low molecular weight fluoroorganic compounds and methods thereof.

主权项

1. A method of purifying a product comprising the following steps
(i) providing a fluoropolymer latex substantially free of a fluorinated emulsifier, wherein the fluoropolymer latex comprises at least 0.1% by weight solids and at least one low molecular weight fluoroorganic compound wherein the low molecular weight fluoroorganic compound is fluorinated and comprises a polar group and/or a reactive group; (ii) contacting the fluoropolymer latex with a radical-forming process to degrade the at least one low molecular weight fluoroorganic compound into carbon dioxide, water, fluorine ions, and optionally cations; and (iii) optionally, removing the fluorine ions and cations.