Process for producing fluoroionomer, method for purification and concentration of the ionomer, and method of film formation
US7482415B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2001 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Jul 28, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/003
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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)1/LOSO2CFY(CF2)mO(CFXCF2O)nCF═CF2 (I)wherein M is H or a metal with a valence of L (L is 1, 2 or 3), X is F, Cl or CF3, 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, CF2═CFORf (Rf is C1 to C5 perfluoroalkyl) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.