METHOD FOR PRODUCING FLUORINATED COPOLYMER

To provide a process by which from a mixture containing a fluorinated copolymer, an unreacted monomer and a polymerization medium, the unreacted monomer and the polymerization medium can efficiently be recovered, and a lower polymer contained in the obtainable fluorinated copolymer can readily be re...

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Bibliographische Detailangaben
Hauptverfasser: SHIMOHIRA, Tetsuji, ABE, Kaori, SAITO, Susumu
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:To provide a process by which from a mixture containing a fluorinated copolymer, an unreacted monomer and a polymerization medium, the unreacted monomer and the polymerization medium can efficiently be recovered, and a lower polymer contained in the obtainable fluorinated copolymer can readily be reduced. A process for producing a fluorinated copolymer comprising (I) a step of polymerizing a fluorinated monomer having a carboxylic acid functional group or a sulfonic acid functional group and a fluorinated olefin in a polymerization medium to obtain a mixture containing a fluorinated copolymer, the unreacted monomer and the polymerization medium, (II) a step of continuously or intermittently transferring the mixture to an evaporation container equipped with a stirring machine and heating the mixture in the evaporation container with stirring to evaporate and recover the unreacted monomer and the polymerization medium and to obtain the fluorinated copolymer, and (III) a step of washing the fluorinated copolymer with a washing medium.