Abstract: To provide a process for safely producing a perfluoroacyl peroxide with good productivity. By supplying a perfluoroacyl halide-containing organic solvent solution, an aqueous solution of hydrogen peroxide or a metal peroxide, and an aqueous basic alkali metal compound solution to a tubular reactor to allow them to react with one another, in a flow rate ratio of, as represented by molar ratio of the compounds in the solutions, from 1.00 to 1.35 of the basic alkali metal compound and from 0.60 to 40 of hydrogen peroxide or the metal peroxide per 1 of the perfluoroacyl halide, the yield of a perfluoroacyl peroxide based on the material perfluoroacyl halide can be remarkably improved as compared with conventional technique.

Abstract: A process for producing a perfluoropolymer, the process including extruding a polymer obtained by polymerizing a perfluoromonomer to prepare strands, and bringing a gas comprising from 3 to 50 volume % of fluorine gas into contact with the strands; the process being conducted on an apparatus that includes an extruder for melting and extruding the polymer obtained by polymerizing a perfluoromonomer, a die having a plurality of pores for preparing the strands from the molten polymer extruded, and a fluorination tank for bringing the gas comprising from 3 to 50 volume % of fluorine gas into contact with the strands.

Abstract: To provide a process for safely producing a perfluoroacyl peroxide with good productivity. By supplying a perfluoroacyl halide-containing organic solvent solution, an aqueous solution of hydrogen peroxide or a metal peroxide, and an aqueous basic alkali metal compound solution to a tubular reactor to allow them to react with one another, in a flow rate ratio of, as represented by molar ratio of the compounds in the solutions, from 1.00 to 1.35 of the basic alkali metal compound and from 0.60 to 40 of hydrogen peroxide or the metal peroxide per 1 of the perfluoroacyl halide, the yield of a perfluoroacyl peroxide based on the material perfluoroacyl halide can be remarkably improved as compared with conventional technique.

Abstract: To provide a process for efficiently producing a perfluoropolymer having unstable terminal groups reduced, a production apparatus, and a process for efficiently producing an electrolyte membrane for polymer electrolyte fuel cells excellent in the durability. A process for producing a perfluoropolymer, which comprises extruding a polymer obtained by polymerizing a perfluoromonomer to prepare strands, and bringing gas containing from 3 to 50 volume % of fluorine gas into contact with the strands; an apparatus 10 for producing a perfluoropolymer, comprising an extruder 11 for melting and extruding a polymer obtained by polymerizing a perfluoromonomer, a die 12 for preparing strands 1 from the molten polymer, and a fluorination tank 13 to bring gas containing fluorine gas into contact with the strands 1; and a process for producing an electrolyte membrane for polymer electrolyte fuel cells, wherein the perfluoropolymer obtained by the above production process is used.

Abstract: To provide a fluorinated aromatic polymer having excellent heat resistance and a low relative permittivity; and an insulating film for electronic devices and an insulating film for multilayered wiring boards, which are made of the polymer. A fluorinated aromatic polymer which contains two or more crosslinkable functional groups (A) per molecule and has a number average molecular weight of from 1×103 to 5×105 and an ether linkage and which is produced by e.g.

Abstract: To provide a fluorinated aromatic polymer having excellent heat resistance and a low relative permittivity; and an insulating film for electronic devices and an insulating film for multilayered wiring boards, which are made of the polymer. A fluorinated aromatic polymer which contains two or more crosslinkable functional groups (A) per molecule and has a number average molecular weight of from 1×103 to 5×105 and an ether linkage and which is produced by e.g.