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    • 7. 发明授权
    • Production method of microporous polyethylene membrane and battery separator
    • 微孔聚乙烯膜和电池隔膜的生产方法
    • US07988895B2
    • 2011-08-02
    • US12088037
    • 2006-09-27
    • Kotaro TakitaShintaro KikuchiKotaro Kimishima
    • Kotaro TakitaShintaro KikuchiKotaro Kimishima
    • B29C47/06
    • H01M2/1653B01D67/002B01D69/12B01D71/26B01D2323/12B01D2325/22B01D2325/34B32B5/18B32B27/32H01G9/02H01M2/145H01M2/162H01M10/0565
    • A microporous polyethylene membrane having well-balanced permeability, mechanical properties, heat shrinkage resistance, compression resistance, electrolytic solution absorbability, shutdown properties and meltdown properties, with an average pore diameter changing in a thickness direction is produced by melt-blending a polyethylene resin and a membrane-forming solvent to prepare a solution A having a resin concentration of 25 to 50% by mass and a solution B having a resin concentration of 10 to 30% by mass, the resin concentration in the solution A being higher than that in the solution B, (a) simultaneously extruding the resin solutions A and B through a die, cooling the resultant extrudate to provide a gel-like sheet in which the resin solutions A and B are laminated, and removing the membrane-forming solvent from the gel-like sheet, or (b) extruding the resin solutions A and B through separate dies, removing the membrane-forming solvent from the resultant gel-like sheets A and B to form microporous polyethylene membranes A and B, and alternately laminating the microporous polyethylene membranes A and B, while easily controlling the average pore diameter distribution in the microporous polyethylene membrane in a thickness direction.
    • 通过将聚乙烯树脂和聚乙烯树脂熔融共混来制造平均孔径在厚度方向上变化的具有良好平衡的渗透性,机械性能,耐热收缩性,耐压缩性,电解溶液吸收性,停机性和熔融性的微孔聚乙烯膜, 成膜溶剂以制备树脂浓度为25〜50质量%的溶液A和树脂浓度为10〜30质量%的溶液B,溶液A中的树脂浓度高于 溶液B,(a)通过模具同时挤出树脂溶液A和B,冷却所得挤出物以提供其中层压有树脂溶液A和B的凝胶状片材,并从凝胶中除去成膜溶剂 或(b)通过分开的模具挤出树脂溶液A和B,从得到的凝胶状片材A和B中除去成膜溶剂, 形成微孔聚乙烯膜A和B,并且交替地层叠微孔聚乙烯膜A和B,同时容易地控制微孔聚乙烯膜在厚度方向上的平均孔径分布。