Manufacture of porous tetrafluoroethylene resin

Abstract

Abstract PURPOSE:To provide a uniform fine pore, by stretching a sintered nonporous tetrafluoroethylene resin by three times and below at the temperature under a secondary transition point, then stretching it by two times and more at the temperature above the secondary transition point and below a melting point. CONSTITUTION:After a sintered nonporous tetrafluoroethylene resin is stretched by three times and below at the temperature under a secondary transition point near 130 deg.C, it is stretched by two times and more at the temperature above the secondary transition point and below a melting point and the porous tetrafluoroethylene resin having a uniform and fine pore is obtained. A stretch velocity can be set at will according to a desired pore ratio and pore diameter and if it is in the range in which a uniform temperature and deformation stress are given to the starting material of the tetrafluoroethylene resin to be stretched, the larger the value of the stretch velocity is, the larger the deformation stress is made, so it is suitable for making the resulted pore diameter uniform and fine.

Inventors

• 👤 Shigeru Asako
• 👤 茂 浅古
• 👤 Koichi Okita
• 👤 晃一 沖田

Bibliographic Details