Patent ID: 8092935
Filing Date: 2012-01-10
Classification: H01M,Y02E,Y02P

Abstract:
1. A reactive polymer-supported porous film for a battery separator, characterized in that the reactive polymer-supported porous film comprises: a substrate porous film of a porous film, the porous film has a temperature, at which a thickness of the porous film is reduced to ½ of a thickness when a probe is placed on the porous film in the case that the thickness of the porous film is measured by placing the probe having a diameter of 1 mm on the porous film under a load of 70 g and heating the porous film from a room temperature at a temperature-increase rate of 2° C./minute, of 200° C. or more; and a reactive polymer supported on the substrate porous film, the reactive polymer is obtainable by reacting: a crosslinkable polymer obtainable by copolymerizing: a crosslinkable monomer having in a molecule a 3-oxetanyl group; and a crosslinkable monomer having a reactive group capable of reacting with an isocyanate group; and a polyfunctional isocyanate to be partially crosslinked, wherein the substrate porous film comprises a polyolefin resin composition comprising: a polyolefin resin having a weight average molecular weight of at least 500,000; and a crosslinkable rubber having a double bond in a molecular chain, and the substrate porous film is obtainable by crosslinking the crosslinkable rubber.