| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator having excellent permeability of liquid and water retentivity without worsening bromine resistance and a method of manufacturing this separator. SOLUTION: This separator has a network structure part 1 thermally fusing the fellow ethylene system resin particles of 500,000 or more average molecular weight through a hole 2, the separator is formed by a compound structure unit of 20 to 70% total unit porosity having an aggregate structure part 3 aggregating a plurality of silica particles through a void 4 in this hole 2. In a method of manufacturing this separator, a powdery mixture, consisting of 100 pts.wt. ethylene system resin particle of 200μm or less mean grain size 500,000 or more average molecular weight and 10 to 200 pts.wt. aggregate silica particle of 100μm or less mean grain size, is pressed powder-molded at a molding temperature less than 200 deg.C with volumetric ratio 40% or more relating to a cavity. |
