Patent ID: 6713567
Filing Date: 2004-03-30
Classification: C08F,C08J,H01M,Y02E,Y02P

Abstract:
A process for forming an ionomer, comprisingcontacting a polymer comprising monomer units of vinylidene fluoride and 0.5-50 mole % of a perfluoroalkenyl monomer having a pendant group of the formula â€”(Oâ€”CF2CFR)aOâ€”CF2(CFRâ€²)bSO2F â€ƒwherein R and Râ€² are independently selected from F, Cl or a perfluorinated alkyl group having 1 to 10 carbon atoms, a=0, 1 or 2, b=0 to 6, with an excess of a solution of ammonium carbonate for a period of time sufficient to obtain the degree of conversion desired to the ammonium sulfonate form of the polymer, thereby forming an ammonium ionomer.