Patent ID: 7563532

Claim:
A fluorinated ion exchange polymer prepared by grafting a monomer on to a base polymer, wherein the grafting monomer is selected from the group consisting of structure 1a, structure 1b and mixtures thereof, wherein for 1a and 1b, Y is independently selected from the group consisting of —R F SO 2 F (sulfonyl fluoride), —R F SO 3 M (fluorosulfonic acid or salt), —R F SO 2 NH 2 (fluorosulfonamide), and —R F SO 2 N(M)SO 2 R 2 F (imide); wherein M is H, an alkali cation, or ammonium; and R F and R 2 F groups are perfluorinated or partially fluorinated, and may optionally include ether oxygens; and n is between 1 and 2 for 1a, or n is between 1 and 3 for 1b.