Polyolefin porous film, separator for energy storage device, and energy storage device
A polyolefin porous film is provided, the film comprising a polyethylene-based resin, wherein a weight average molecular weight of the polyethylene-based resin is 450,000 or less, and a content of a high molecular weight component having a molecular weight of 1,000,000 or more in the polyethylene-based resin is 2 to 11% by mass.
1. A polyolefin porous film, comprising a polyethylene-based resin and a polypropylene-based resin,
the polyolefin porous film has a pair of polypropylene-based resin layers comprising the polypropylene-based resin on both surfaces of a polyethylene-based resin layer comprising the polyethylene-based resin,
the polyolefin porous film has a film thickness of 8 to 40 μm,
a Gurley value of the polyolefin porous film is 65 to 230 seconds/100cc,
a ratio of the Gurley value of the polyethylene-based resin layer to the Gurley value of the polyolefin porous film is 20% or less,
wherein a weight average molecular weight of the polyethylene-based resin is 450,000 or less,
a molecular weight distribution of the polyethylene-based resin is 6 to 13,
a content of a high molecular weight component having a molecular weight of 1,000,000 or more in the polyethylene-based resin is in a range of 5 to 11% by mass,
a melt flow rate of the polyethylene-based resin is in a range of 0.1 to 10 g/10 minutes, and
a weight average molecular weight of the polypropylene-based resin is 500,000 to 1,000,000.
2. The polyolefin porous film according to claim 1 , wherein the melt flow rate of the polyethylene-based resin is in a range of 0.3 to 5 g/10 minutes.
3. The polyolefin porous film according to claim wherein the melt flow rate of the polyethylene-based resin is in a range of 0.6 to 3 g/10 minutes.
4. The polyolefin porous film according to claim 1 , wherein the content of the high molecular weight component having a molecular weight of 1,000,000 or more in the polyethylene-based resin is in a range of 5 to 10% by mass.
5. The polyolefin porous film according to claim 1 , wherein the content of the high molecular weight component having a molecular weight of 1,000,000 or more in the polyethylene-based resin is in a range of 6 to 9% by mass.
6. A separator for energy storage device, wherein the separator has the polyolefin porous film according to claim 1 .
7. An energy storage device, comprising the separator for energy storage device according to claim 6 , a cathode and an anode.