Patent ID: 8202617

Claim:
A method of producing a laminate containing a fluoropolymer comprising the step of removing oligomers by extruding the fluorine-containing ethylenic polymer obtained by polymerization using an extruder having a vent mechanism equipped with a pressure reducing device, said fluoropolymer being an oligomer-containing or oligomer-free fluoropolymer, and being a copolymer comprising 0 to 60 mole percent as a total of a perfluorovinyl ether unit derived from a perfluorovinyl ether represented by the general formula (ii): CF 2 ═CF—ORf 2 (ii) wherein Rf 2 represents a perfluoroalkyl group containing 1 to 5 carbon atoms, and/or a fluoroolefin unit derived from a fluoroolefin represented by the general formula (iii): CX 1 2 ═CX 2 (CF 2 ) n X 3 (iii) wherein X 1 and X 2 are the same or different and each represents hydrogen atom or fluorine atom, X 3 represents hydrogen atom, fluorine atom or chlorine atom, and n represents an integer of 1 to 10, 20 to 80 mole percent of tetrafluoroethylene unit and 20 to 80 mole percent of ethylene unit, and wherein the content of oligomers having a number average molecular weight of not higher than 10,000 is not higher than 0.05% by mass relative to the mass of said fluoropolymer.