Patent ID: 6395838
Filing Date: 2002-05-28
Classification: C08F,C08L

Abstract:
A process comprising contacting a polymer having a backbone which comprises at least 50% methylene units with a solvent which swells or dissolves said polymer to form a solvent-swollen polymer or polymer solution;contacting said solvent swollen polymer or polymer solution with a free-radical initiator and a compound of the formula F2C&boxH;CFR1R2SO2X wherein R1 represents a covalent bond or a perfluoroalkenyl radical having 1 to 20 carbon atoms; R2 is a radical of the formula: â€”Oâ€”[CF2CF(R3)â€”Om]nâ€”CF2CF2â€”â€ƒwherein m=0 or 1, n=0, 1, or 2, and R3 is F or a perfluoroalkyl radical having 1-10 carbons; and X is F or a radical represented by the formula â€”Y(M)(SO2R4)p wherein Y is C or N, M is an alkali metal, R4 is a perfluoroalkyl radical having 1-10 carbons optionally substituted with one or more ether oxygens, and p=1 or 2 with the proviso that p=1 when Y is N and p=2 when Y is C; to form a reaction mixture;providing sufficient heat to said reaction mixture to cause the initiation of free-radical reaction; and, reacting said mixture to form a graft polymer.