Provided is a process for making a copolymer of fluorinated olefin and
hydrocarbon olefin selected from ethylene, propylene and mixtures
thereof, the process comprising a substantially emulsifier free aqueous
emulsion polymerization of said fluorinated olefin and said hydrocarbon
olefin, optionally in the presence of fluoropolymer particles and/or
fluorinated liquid in a form suitable to improve the copolymerization of
fluorinated olefin and hydrocarbon olefin.