Abstract: An electroconductive stack body having on at least one side surface of a substrate an electroconductive layer that has a network structure that is made by a linear structural body, wherein, an opening portion that satisfies Expression (1) in an opening area of an opening portion that is formed by the network structure, average value A of the opening area is less than or equal to 20 ?m2 and variation deviation ?of the opening area defined by Expression (2) is less than or equal to 26 ?m2: X<Xmax ×0.9 ??Expression (1) ?={?(X?A)2)/N}0.5 (wherein for ?, i=1 to N) ??Expression (2) wherein in the expressions, X represents each of the opening areas of the opening portions that satisfy Expression (1), Xmax represents the maximum value of each opening area, A represents the average value of the opening areas X, and N represents the total number of the opening portions that satisfy Expression (1).

Abstract: A microporous membrane roll includes cores formed in whole or in part from electrically conductive members, and microporous membranes wound around the cores. First and second surfaces of the microporous membranes are equivalently charged with antipolar charges. A method of manufacturing the microporous membrane roll includes diselectrifying the microporous membranes with a diselectrifier, and winding the microporous membranes around the cores formed in whole or in part from the electrically conductive members.

Abstract: An electroconductive stack body having on at least one side surface of a substrate an electroconductive layer that has a network structure that is made by a linear structural body, wherein, regarding an opening portion that satisfies Expression (1) in an opening area of an opening portion that is formed by the network structure, average value A of the opening area is less than or equal to 20 ?m2 and variation deviation ? of the opening area defined by Expression (2) is less than or equal to 26 ?m2: X<Xmax×0.9??Expression (1) wherein in the expression, X represents each opening area, and Xmax represents the maximum value of each opening area; and ?={?(X?A)2)/N}0.