| abstract |
An object of this invention is to provide the separator excellent in heat resistance, a shutdown function, flame retardancy, and handling property. The separator for nonaqueous secondary batteries of this invention is a separator for nonaqueous secondary batteries provided with the polyolefin microporous membrane and the heat-resistant porous layer which consists of heat resistant resin laminated | stacked on at least one surface of this polyolefin microporous membrane, and is 200 degreeC The inorganic filler which consists of a metal hydroxide which a dehydration reaction generate | occur | produces at the temperature above 400 degreeC is contained. |