Abstract: A separator includes a porous substrate, and a porous layer formed on one or both surfaces of the substrate and containing a polyvinylidene fluoride type resin and a filler, in which the filler content in the porous layer is from 30 to 80% by mass with respect to the total mass of the polyvinylidene fluoride type resin and the filler, and the polyvinylidene fluoride type resin is at least one resin selected from the following resin A and B: resin A: a copolymer having a weight average molecular weight of from 100,000 to 350,000, and a content of HFP is more than 5% by mass but not more than 11% by mass; and resin B: a copolymer having a weight average molecular weight of from 100,000 to 1,000,000, in which a content of HFP is more than 11% by mass but not more than 15% by mass.

Abstract: A separator for a non-aqueous secondary battery, containing a porous substrate, and an adhesive porous layer that is provided on one side or both sides of the porous substrate, in which the adhesive porous layer contains a polyvinylidene fluoride type resin including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, and the polyvinylidene fluoride type resin has an acid value of from 3.0 mgKOH/g to 20 mgKOH/g.

Abstract: There is provided a separator for a non-aqueous secondary battery, containing a porous substrate, and an adhesive porous layer that is provided on one side or both sides of the porous substrate, in which the adhesive porous layer contains a polyvinylidene fluoride type resin A including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, and a polyvinylidene fluoride type resin B including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, a proportion of the hexafluoropropylene monomer unit in the polyvinylidene fluoride type resin A is more than 1.

Abstract: There is provided a separator for a non-aqueous secondary battery, containing a porous substrate, and an adhesive porous layer that is provided on one side or both sides of the porous substrate, in which the adhesive porous layer contains a polyvinylidene fluoride type resin A including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, and a polyvinylidene fluoride type resin B including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, a proportion of the hexafluoropropylene monomer unit in the polyvinylidene fluoride type resin A is more than 1.

Abstract: Provided is a separator for a nonaqueous electrolyte battery, including a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin. The ratio of the standard deviation of the areal weight of the adhesive porous layer to the mean of the areal weight of the adhesive porous layer (g/m2) (standard deviation/mean) is 0.3 or less.

Abstract: Provided is a separator for a non-aqueous secondary battery, including: a porous substrate, and a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1). In expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler. Also provided is a separator for a non-aqueous secondary battery, including: a porous substrate, a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that includes a resin and an filler, and that satisfies the following expression (2), and an adhesive porous layer that is provided on both sides of a stacked body of the porous substrate and the heat resistant porous layer, and that includes an adhesive resin.

Abstract: Provided is a separator for a nonaqueous electrolyte battery, including a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin. The separator has a thermal expansion coefficient of more than 0% and 10% or less in the width direction when heat-treated at 105° C. for 30 minutes.

Abstract: A separator for a non-aqueous secondary battery, containing a porous substrate, and an adhesive porous layer that is provided on one side or both sides of the porous substrate, in which the adhesive porous layer contains a polyvinylidene fluoride type resin including a vinylidene fluoride monomer unit and a hexafluoropropylene monomer unit, and the polyvinylidene fluoride type resin has an acid value of from 3.0 mgKOH/g to 20 mgKOH/g.

Abstract: The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, that contains polyvinylidene fluoride resin A and polyvinylidene fluoride resin B, and that has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm.

Abstract: A separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed on one side or both sides of the porous substrate and contains the following resin A and the following resin B. Resin A: a polyvinylidene fluoride resin containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content ratio of structural units derived from HFP in each of the VDF copolymers being from 0.5 mol % to 1.5 mol % of a total content of structural units in each of the VDF copolymers; and Resin B: a polyvinylidene fluoride resin containing structural units derived from VDF and structural units derived from HFP, a total content ratio of structural units derived from HFP in each of the VDF copolymers being greater than 1.5 mol % of a total content of structural units in each of the VDF copolymers.

Abstract: Provided is a separator for a non-aqueous secondary battery, including: a porous substrate, and a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1). In expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler. Also provided is a separator for a non-aqueous secondary battery, including: a porous substrate, a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that includes a resin and an filler, and that satisfies the following expression (2), and an adhesive porous layer that is provided on both sides of a stacked body of the porous substrate and the heat resistant porous layer, and that includes an adhesive resin.

Abstract: A separator includes a porous substrate, and a porous layer formed on one or both surfaces of the substrate and containing a polyvinylidene fluoride type resin and a filler, in which the filler content in the porous layer is from 30 to 80% by mass with respect to the total mass of the polyvinylidene fluoride type resin and the filler, and the polyvinylidene fluoride type resin is at least one resin selected from the following resin A and B: resin A: a copolymer having a weight average molecular weight of from 100,000 to 350,000, and a content of HFP is more than 5% by mass but not more than 11% by mass; and resin B: a copolymer having a weight average molecular weight of from 100,000 to 1,000,000, in which a content of HFP is more than 11% by mass but not more than 15% by mass.

Abstract: Provided is a separator for a non-aqueous secondary battery, including: a porous substrate, and a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that is an aggregate of resin particles and an inorganic filler, and that satisfies the following expression (1). In expression (1), Vf is a volume proportion (% by volume) of the inorganic filler in the heat resistant porous layer, and CPVC is a critical pigment volume concentration (% by volume) of the inorganic filler. Also provided is a separator for a non-aqueous secondary battery, including: a porous substrate, a heat resistant porous layer that is provided on one side or both sides of the porous substrate, that includes a resin and an filler, and that satisfies the following expression (2), and an adhesive porous layer that is provided on both sides of a stacked body of the porous substrate and the heat resistant porous layer, and that includes an adhesive resin.

Abstract: Provided is a separator for a nonaqueous electrolyte battery, including a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin. The ratio of the standard deviation of the areal weight of the adhesive porous layer to the mean of the areal weight of the adhesive porous layer (g/m2) (standard deviation/mean) is 0.3 or less.

Abstract: Provided is a separator for a nonaqueous electrolyte battery, including a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin. The ratio of the standard deviation of the areal weight of the adhesive porous layer to the mean of the areal weight of the adhesive porous layer (g/m2) (standard deviation/mean) is 0.3 or less.

Abstract: Provided is a separator for a nonaqueous electrolyte battery, which includes a porous substrate and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin. The separator has a pore size distribution such that, as measured by a pore size distribution measurement test, the pore size at the maximum value of the maximum peak is within a range of 0.02 ?m to 0.1 ?m, and the pore size distribution range value ? defined as follows is 0.4 or less. The pore size distribution range value ? herein is a value calculated by the following equation from pore sizes D90, D10, and D50 corresponding to cumulative pore size distributions of 90%, 10%, and 50%, respectively: pore size distribution range value ?=(D90?D10 )/D50.

Abstract: A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 ?m or less, and the adhesive porous layer satisfying Inequality (1): 0.5?a/r?3.0, wherein, in Inequality (1), “a” represents an average thickness (?m) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (?m) of the filler contained in the adhesive porous layer.

Abstract: Provided is a non-aqueous-secondary-battery separator including: a microporous membrane; and an adhesive porous layer which is provided on one or both surfaces of the microporous membrane and includes a fibrillar polyvinylidene fluoride resin, in which an average hole diameter acquired from the specific surface area of the microporous membrane is greater than 90 nm and equal to or smaller than 250 nm, peeling strength between the microporous membrane and the adhesive porous layer is equal to or greater than 0.10 N/cm, and a fibrillar diameter acquired from the specific surface area of the adhesive porous layer is from 50 nm to 70 nm.

Abstract: Provided is a separator for a nonaqueous electrolyte battery including a composite membrane. The composite membrane includes a porous substrate that contains a thermoplastic resin and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin. The difference between the Gurley number of the porous substrate and the Gurley number of the composite membrane is 75 sec/100 cc or less. The difference between the tortuosity of the porous substrate and the tortuosity of the composite membrane is 0.30 or less.

Abstract: A polyolefin microporous membrane, the membrane having, when measured by DSC, a degree of crystallinity of from 65 to 85%, a lamellar crystal/crystal ratio of from 30 to 85%, a crystal length of from 5 nm to 50 nm and an amorphous length of from 3 nm to 30 nm, and a polyolefin microporous membrane, the membrane having, when measured by X-ray diffractometry, crystal size of from 12.5 nm to 13.5 nm and a degree of crystallinity of from 64 to 68%.