The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2016
Filed:
Mar. 13, 2015
Asahi Glass Company, Limited, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
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 fanctional 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.