Patent ID: 9464176
Filing Date: 2016-10-11
CPC Classification: B01J,C08F,C08J,C25B

Claim Text:
1. A process for producing a fluorinated copolymer, which comprises: (I) 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) continuously or intermittently transferring mixture obtained in (I) 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) washing the fluorinated copolymer obtained in (II) with a washing medium.