| abstract |
The laminated body of the present invention is a laminated body in which a porous layer containing a resin is laminated on at least one surface of a porous film mainly composed of polyolefin, wherein the critical surface tension of the outermost surface of the porous layer (A ), and the relationship between the critical surface tension (B) on the interface side of the porous membrane when the laminate is peeled off at the interface between the porous membrane and the porous layer is 0≤ (A)‑(B)≤20mN/m means (invention 1). The laminated body of the present invention has a porous film mainly composed of polyolefin and a porous layer containing a resin, which can be used as a separator of a secondary battery and has higher dielectric strength, wherein (A) is relatively porous The amount of increase in the amount of resin contained per unit area of the layer, the increase in insulation resistance, and (B) the increase in the amount of polyolefin contained per unit area of the porous film, and the increase in insulation resistance The relationship between the rising amounts is represented by (A)>(B) (Invention 2). |