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:
Jan. 27, 2009
Filed:
Feb. 16, 2001
Masayoshi Tatemoto, Takatsuki, JP;
Tadashi Ino, Settsu, JP;
Kenji Ishii, Settsu, JP;
Takuji Ishikawa, Settsu, JP;
Takuya Arase, Settsu, JP;
Masayoshi Tatemoto, Takatsuki, JP;
Tadashi Ino, Settsu, JP;
Kenji Ishii, Settsu, JP;
Takuji Ishikawa, Settsu, JP;
Takuya Arase, Settsu, JP;
Daikin Industries, Ltd., Osaka-Shi, JP;
Abstract
The present invention provides a process for producing a fluorinated ionomer, comprising copolymerizing, in the presence of a polymerization initiator, (i) a compound represented by Formula (I)(M)OSOCFY(CF)O(CFXCFO)CF═CF  (I)wherein M is H or a metal with a valence of L (L is 1, 2 or 3), X is F, Cl or CF, Y is halogen, m is 1 to 5, and n is 0 to 5, (ii) tetrafluoroethylene and (iii) at least one third monomer selected from the group consisting of hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, CF═CFORf (Rf is Cto Cperfluoroalkyl) and ethylene. The present invention further provides a method for purifying and concentrating a fluorinated ionomer, comprising ultrafiltration or dialysis of a fluorinated ionomer solution or dispersion, and a method for forming a film of the fluorinated ionomer.