Polyolefin micro-porous film and power-storage device
AssigneeUbe Industries, Ltd.
InventorsTaiga ADACHI, Ryou SAKIMOTO
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Abstract
This polyolefin micro-porous film includes a multilayered structure, wherein the multilayered structure contains a first layer composed of polypropylene resin, a second layer composed of polyethylene resin and provided on the first layer, and a third layer composed of polypropylene resin and provided on the second layer. Furthermore, a thickness of the first layer is thinner than a thickness of the second layer, a thickness of the third layer is thinner than the thickness of the second layer, and in the multilayered structure, a thickness is 16 μm or less, a porosity is 40 to 70%, and a surface opening ratio is 10 to 30%.
Claims11
A polyolefin micro-porous film comprising a multilayered structure, wherein the multilayered structure includes:
- a first layer composed of polypropylene resin;
- a second layer composed of polyethylene resin and provided on the first layer;
- and
- a third layer composed of polypropylene resin and provided on the second layer,
- wherein a thickness of the first layer is thinner than a thickness of the second layer,
- wherein a thickness of the third layer is thinner than the thickness of the second layer, and
- wherein in the multilayered structure, a thickness is 16 μm or less, a porosity is 40 to 70%, and an surface opening ratio is 10 to 30%.
Dependencies are inferred from the claim text.