| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a film having properties susceptible to soaking and penetration of electrolytic solution in which thermal shrinkage is reduced, and excellent handleability is ensured, and which is visible even in electrolytic solution. <P>SOLUTION: The method of producing a film includes following steps (1A), (2A), (3) and (4), or the steps (1B), (3) and (4). Step (1A): a step for bringing a drawing polytetrafluoroethylene film into contact with a solution containing an inorganic powder, step (2A): a step for bringing a film obtained in the step (1A) into contact with a solution containing a resin having a hydrophilic group, step (1B): a step for bringing a drawing polytetrafluoroethylene film into contact with a solution containing an inorganic powder and a resin having hydrophilic group, step (3): a step for making silane coupling agent adhere to a film obtained by the step (2A) or step (1B), step (4): a step for heating a film obtained in the step (3) at 50-200°C and drying. <P>COPYRIGHT: (C)2012,JPO&INPIT |
