| 摘要 |
PROBLEM TO BE SOLVED: To provide a modified fluororesin improved in wear resistance, creep resistance and heat stability at high temperatures by irradiating an ionized radiation to a fluororesin in the state of being heated at a temperature not lower than the melting point in the presence of a modifier under an atmosphere of an oxygen-containing inert gas. SOLUTION: A fluororesin of at least one kind selected from tetrafluoroethylene-based polymers, tetrafluoroethylene/perfluoro(alkylvinylether)- based copolymers and tetrafluoroethylene/hexafluoropropylene copolymers is modified by irradiating an ionized radiation in an exposed dose of 0.1 KGy to 10 MGy in the state of being heated at a temperature higher by 10 to 30 deg.C than the melting point of said fluororesin under an atmosphere of an inert gas having an oxygen concentration of 10 Torr or less in the presence of a modifier selected from hydrogen, fluorine and fluorocompounds. This modifying operation may be carried out either for a fluororesin molded article or for the fluororesin powder which modified powder is thereafter mechanically pulverized into particulates and then pressure-molded to give a fluororesin molded article.
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