Japan Atomic Energy Research Institute

Raytech Corporation

Akihiro Oshima

Yoneho Tabata

Akira Udagawa

Yuichi Yoshida

Tadao Seguchi

Yosuke Morita

Kazushige Otsuhata

Kohji Ueno

Tetsuya Ikeda

Hisaaki Kudoh

Tadao Suguchi

Unsintered poly(tetrafluoroethylene) resin feeds are treated with ionizing radiation in an absorbed dose of no more than 1,000 Gy at room temperature in air so that only the melting temperature of the resin feeds is shifted toward the lower end without changing the quantities of heat of fusion and crystallization.

Radiation-modified poly (tetrafluoroethylene) resin feeds and a process for producing the same

Fibers as a reinforcing substrate are impregnated with the particles of polytetrafluoroethylene and pressed into a shape at the melting point of polytetrafluoroethylene. Alternatively, the reinforcing substrate sandwiched between polytetrafluoroethylene sheets is pressed into a shape at the melting point of polytetrafluoroethylene. In either case, the shaped article is then exposed to an ionizing radiation in an oxygen-free atmosphere at the melting point of polytetrafluoroethylene. The inherent characteristics of the polytetrafluoroethylene, i.e., heat resistance, chemical resistance, abrasion resistance and lubricity, are retained and yet radiation resistance and resin transparency are imparted.

Fluoroplastic composites and a process for producing the same

Modified PTFE is produced by exposing a starting PTFE to an ionizing radiation for a total dose of at least 100 kGy in the absence of oxygen at a temperature not lower than the crystal melting point of the starting PTFE. The thus modified PTFE is improved in radiation resistance and has rubber characteristics.

Modified polytetrafluoroethylene and process for its production by

Growing community of inventors

Takasaki, Japan

Akihiro Oshima