| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a laminated porous film that has a porous structure that sufficiently secures also the communication property, while holding the strength, and can exert a more excellent breakdown characteristic than a conventional polypropylene porous film. <P>SOLUTION: There is provided a method for manufacturing a laminated porous film laminating at least two porous layers and havingβactivity. In the method, a layer (PP layer) containing polypropylene-based resin is prepared, a heat-resistant layer (HR layer) is prepared from a resin composition having a higher crystal melting peak temperature than that in a resin composition of the PP layer, a laminated non-porous film-like material composed of at least two layers of the PP layer and the HR layer is prepared and the non-porous film-like material is made porous. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
