Abstract: A polyolefin microporous film includes: a polyethylene-based resin; and a polyolefin (B) other than polyethylene. The polyolefin microporous film has peaks at temperatures of lower than 150° C. and 150° C. or higher respectively in a differential scanning calorimeter (DSC). A half width of the peak at lower than 150° C. is 10° C. or lower. A puncture strength in terms of 10 ?m is 2.0 N or more.

Abstract: A porous polyolefin film has a shutdown temperature of 133° C. or lower, a porosity of 41% or more, and a value of 12,500 or more, which is calculated by (tensile elongation (%) in the machine direction (MD)×tensile strength (MPa) in the machine direction (MD)+tensile elongation (%) in the transverse direction (TD)×tensile strength (MPa) in the transverse direction (TD))/2, the TSD (° C.) and Tm satisfying formula (1): Tm?TSD?0 ??(1), where TSD represents the shutdown temperature (° C.), and Tm represents the lowest among the melting point (° C.) of all layers, wherein excellent safety such as protection from internal short circuit and/or thermal runaway is achieved in the porous polyolefin film, without reducing the permeability as shown in conventional microporous films.

Abstract: A polypropylene film includes a surface layer (I) with polypropylene as a main component at least on one face of a base layer. Surface free energy of the surface layer (I) is 15 mN/m or more and less than 28 mN/m. A mold release film includes a polypropylene film including a surface layer (I) with polypropylene as a main component at least on one face of a base layer, wherein surface free energy of the surface layer (I) is 15 mN/m or more and less than 28 mN/M.

Abstract: A porous film is excellent in barrier properties such as blood barrier property and viral barrier property, puncture strength, and moisture permeability. A waterproof and moisture-permeable material that uses the porous film, and reduces the stuffy feeling that a person feels when wearing it and is excellent in the wearing comfortableness. The porous film has a degree of moisture permeability greater than or equal to 150 g/m2·h, a puncture strength is greater than or equal to 100 N/mm, and a blood barrier property is class 4 or higher.

Abstract: A porous film that excels when used as a separator for a lithium-ion battery not only in separator followability to expansion and contraction of an electrode during charging and discharging, but also in charging and discharging cycle characteristics. The porous film, when the thickness of a circular region having a diameter of 10 mm as an initial thickness t0 after a load of 50 g is applied onto the circular region for 10 seconds, as a thickness t after a load of 500 g is subsequently applied onto the same region for 10 seconds, and as a thickness t1 after 10 seconds has passed after the load applied onto the same region is subsequently changed to 50 g, the thickness change rate is 10% to 50%, and the thickness (t1) recovery rate is 80% to 99.9%.

Abstract: A porous polypropylene film includes a polypropylene resin and a ?-crystal nucleating agent, in which a temperature at which a heat shrinkage rate of a dimension in the width direction of the film is 5% is 130 to 200° C., air permeation resistance is 50 to 500 sec/100 ml, porosity is 35 to 70%, and when porosity is ? and air permeation resistance is G, both satisfy expression (1): G+15×??1,200 ??(1).

Abstract: A porous film that excels when used as a separator for a lithium-ion battery not only in separator followability to expansion and contraction of an electrode during charging and discharging, but also in charging and discharging cycle characteristics. The porous film, when the thickness of a circular region having a diameter of 10 mm as an initial thickness t0 after a load of 50 g is applied onto the circular region for 10 seconds, as a thickness t after a load of 500 g is subsequently applied onto the same region for 10 seconds, and as a thickness t1 after 10 seconds has passed after the load applied onto the same region is subsequently changed to 50 g, the thickness change rate is 10% to 50%, and the thickness (t1) recovery rate is 80% to 99.9%.

Abstract: A porous film has an absorbing height of an electrolysis solution of 10 to 60 mm in at least one direction of the film's machine direction or transverse direction, wherein the absorbing height being measured after 30 minutes from the start of the absorption of the electrolysis solution, and a tensile strength at break in the machine direction of not less than 65 MPa. The porous film provides a porous film that has excellent absorption properties for an electrolysis solution and, when used as a separator, exhibits excellent battery properties and workability.

Abstract: A porous polypropylene film roll of which a porous polypropylene film includes a polypropylene resin and having the average value of the porosities, ?ave, of 45 to 90% is wound around a core, and the unevenness of the thickness in the film machine direction is not more than 15%. The porous polypropylene film roll has not only excellent air permeability and porosity, but also excellent thickness uniformity and, therefore, a porous polypropylene film roll which can efficiently utilize the performance of an electric storage device and is suitable for a separator for an electric storage device.

Abstract: A porous polypropylene film has a number of portions where the quantity of light transmitted through each portion is not smaller than 5 times the average quantity of light transmitted through the film is 0.5 portion or less per 1 m2. The porous polypropylene film has a high porosity and excellent production characteristics, and when used as a separator in an electrical storage device, has excellent quality and few defects that could negatively impact battery performance.

Abstract: A power storage device separator includes a polyolefin based porous film laminated on at least one side with a particle-containing layer containing cellulose based resin, inorganic particles, and thermoplastic resin particles with a melting point of 100-140° C.