Patent ID: 7459262

Claim:
A polymer composition comprising: (a) a repeat unit derived from a fluoro-olefin selected from a group consisting of tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, perfluoro-(2,2-dimethyl-1,3-dioxole), perfluoro-(2-methylene-4-methyl-1,3-dioxolane), and CF 2 ═CFO(CF 2 ) t CF═CF 2 , where t is 1 or 2, and R f ″OCF═CF 2 wherein R f ″ is a fluoroalkyl group of from 1 to 10 carbon atoms; (b) a repeat unit comprising at least one cross-linkable functional group, R, having the following structure wherein R 1 is H or C 1 -C 3 alkyl, and R f and R f ' taken together are (CF 2 ) n wherein n is 2 to 10; and (c) a repeat unit comprising at least one protected acid functional group.