Porous polyvinylidene fluoride film and production thereof

Abstract

Abstract PURPOSE:To obtain the title film excellent in the chemical resistance, filtering characteristics, and mechanical properties by selecting a porous film comprising a polyvinylidene fluoride resin and having specified physical properties. CONSTITUTION:A porous film is selected with comprises a polyvinylidene fluoride resin, is substantially free from macrovoid with a diameter of 10mu or higher, and has a porosity of 40-90%, a mean pore diameter at the surface layer of 0.05-5mu, a ratio of the mean pore diameter at the surface layer to that of the cross section of film of 0.5-2.0, a three-dimensional network structure comprising homogeneous continuous pores a pore diameter distribution wherein the ratio of the max. to the min. diameter is 1.2-2.5, a breaking strength of 70-200kg/cm<2>, and an elongation at break of 100-500%.

Inventors

• 👤 Haruo Matsumura
• 👤 松村　晴雄
• 👤 Yoshinao Doi
• 👤 土井　良直

Bibliographic Details