| 摘要 |
PROBLEM TO BE SOLVED: To provide a cross-linked polymer supporting porous film for a battery separator that achieves a battery excellent in safety at high temperature because of sufficient adhesiveness to an electrode and excellent heat resistance, and to provide the battery separator and an electrode/separator assembly obtained using the cross-linked polymer supporting porous film. SOLUTION: The cross-linked polymer supporting porous film is characterized in that the porous film includes a cross-linked body including a resin composition containing a polyolefin resin and a styrene-butadiene copolymer and has a gel fraction of≥5%; a cross-linked polymer having at least one reactive group selected from hydroxy and carboxyl groups in a molecule; and a polyfunctional isocyanate having an isocyanate group at a reactive group/isocyanate group mole ratio in the range from 5 to 200. The battery separator is provided by reacting the reactive group of the cross-linked polymer with the polyfunctional isocyanate to be cross-linked. COPYRIGHT: (C)2009,JPO&INPIT
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