Patent ID: 8207235
Filing Date: 2012-06-26
Classification: C08F,C08J,H01M,Y02E,Y02P

Abstract:
1. A process for stabilizing a semi-crystalline fluoropolymer comprising ion exchange groups, said process comprising: suspending at least one semi-crystalline fluoropolymer having ion exchange groups (polymer (I)) in at least one fluorinated organic dispersing medium (medium (M)) so as to obtain a dispersion (D) of polymer (I) in said dispersing medium (M); contacting said dispersion (D) with fluorine under irradiation with U.V. radiation so as to obtain a stabilized polymer, wherein the polymer (I) comprises: recurring units derived from at least one ethylenically unsaturated fluorinated monomer comprising at least one fluorine atom; and a substantial amount of recurring units derived from at least one ethylenically unsaturated functional monomer comprising at least one ion exchange group; wherein the polymer (I) comprises recurring units derived from at least one fluorinated functional monomer selected from the group consisting of: wherein n is an integer between 0 and 6, and X′ is selected from the group consisting of Cl, Fl, Br, I, —O wherein m is an integer between 1 and 10, and X′ is selected from the group consisting of Cl, Fl, Br, I, —O wherein w is an integer between 0 and 2, RF wherein Ar is a C