| 摘要 |
PROBLEM TO BE SOLVED: To stably provide a composite porous film combining a shut-down function and a heat-resistant shape holding function and high in air permeability, thermal-dimensional stability, surface smoothness, charging/discharging characteristics, durability, etc.SOLUTION: A polyimide solution is ejected from a nozzle or a needle by an electro-spinning method to laminate a nonwoven fabric of polyimide fiber to at least one surface of an air permeable porous film. |
