POROUS FILM AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a porous film that controls drawdown and draw resonance and has slight thickness unevenness in high productivity (high-speed moldability) while maintaining high surface qualities. SOLUTION: The porous film comprises a polyethylene resin composition that comprises 30-200 parts wt. of an inorganic filler based on 100 parts wt. of a polyethylene resin composed of 50-90 wt.% of a linear low-density polyethylene and 10-50 wt.% of a branched-chain low-density polyethylene and has≤60,000Pa×second uniaxial elongational viscosity index (η0) and≥1.6 strain hardening (λ) (λ=η1/η0;η1is uniaxial elongational viscosity at 5 second deformation time). COPYRIGHT: (C)2006,JPO&NCIPI