| 摘要 |
PROBLEM TO BE SOLVED: To obtain a porous film comprising an amide-imide polymer or an imide polymer having an excellent void pore property without having a skin layer substantially on the surface. SOLUTION: The porous film comprises an amide-imide polymer or an imide polymer in which many micropores having a linking property are present, wherein thickness of the film is 5-200μm; an average pore size of the micropores is 0.01-10μm; porosity is 30-80%; and air-permeability showing the linking property of the micropores is 0.2-29 sec/100 cc as the Gurley value. COPYRIGHT: (C)2004,JPO |
