PURPOSE: To impart excellent radiation resistance and rubbery properties to polytetrafluoroethylene(PTFE) by irradiating the PTFE with an ionizing radiation in a specific dose at a temp. higher than the melting point of the PTFE crystals in the absence of oxygen.
CONSTITUTION: A polytetrafluoroethylene(PTFE) sheet is placed in a vacuum or an oxygen-free atmosphere, e.g. an inert gas atmosphere, and irradiated with an ionizing radiation (e.g. γ-ray) in a dose of 1kGy or more at a temp. higher than the melting point of the PTFE crystals. Thus, a modified PTFE is obtained which is prevented from deteriorating in breaking extension and breaking strength upon exposure to a radiation. This modified PTFE is utilizable as an industrial material to be exposed to a radiation and as a medical material sterilizable with a radiation; PTFE has been unusable in these applications. Since also rubbery properties are imparted, the modified PTFE is suited also for use as a heat-resistant sealing material for an instrument, etc.
OTOHATA KAZUE
IKEDA TETSUYA
UENO KOJI
YOSHIDA YUICHI
OSHIMA AKIHIRO
SEGUCHI TADAO
KUDO HISAAKI
JAPAN ATOMIC ENERGY RES INST
| JPS55124612A | 1980-09-25 | |||
| JPS50101450A | 1975-08-12 | |||
| JPS5571724A | 1980-05-30 | |||
| JPS59501749A | 1984-10-18 | |||
| JPH07118423A | 1995-05-09 | |||
| JPH07118424A | 1995-05-09 | |||
| JPS5391959A | 1978-08-12 | |||
| JPS61146522A | 1986-07-04 | |||
| JPS62227940A | 1987-10-06 | |||
| JPS4719609B1 | 1972-06-05 |