Porous Polymer Film

Abstract

A porous polymer film, and method of making the same, wherein according to embodiments of the present disclosure the porous polymer film has a crosslinking reactivity of 1.0 or more, as defined by Equation 1. Crosslinking ⁢ reactivity = ( ( A × B ) / 1 ⁢ 0 ⁢ 0 ⁢ 0 ⁢ 0 ) - C [ Equation ⁢ 1 ] In Equation 1, A denotes the melt fracture temperature (° C.), which is the temperature at which the porous polymer film fractures when stretched under a force of 0.015 N while being heated to 220° C. at a heating rate of 5° C./min by thermomechanical analysis (TMA), B denotes the gel content (%), which is the percentage obtained by dividing the mass of the undissolved residual solid after immersing the porous polymer film in xylene at 135° C. for 3 hours by the initial mass, and C denotes the high load melt index (HLMI) (g/10 min) measured under conditions of a temperature of 190° C. and a load of 21.6 kg according to ASTM D1238 for the porous polymer film.

Dependencies are inferred from the claim text.