Patent ID: 7560517

Claim:
A polymerizable fluoropolymer composition comprising: (i) one or more gaseous fluorinated olefins, (ii) one or more perfluorinated allyl ethers of the formula: CF 2 ═CF—CF(Z)—O—R f (I) wherein Z represents F or CF 3 and R f represents a perfluorinated alkyl group that optionally contains one or more catenary oxygen atoms, and (iii) one or more cure-sites selected from (a) a halogen capable of participating in a peroxide cure reaction or (b) a nitrile group wherein the polymerizable fluorinated composition has fewer polar end groups when polymerized at temperatures greater than 70° C. as compared to a composition polymerized under identical conditions comprising a perfluorinated vinyl ether in place of the perfluorinated allyl ether.