Patent ID: 6861132
Filing Date: 2005-03-01
Classification: A61F,A61L,C08J,Y10T

Abstract:
1. A porous polypropylene film with excellent breathability and continuous through-pores and made of a propylene-based resin composition comprising (I) (i) a propylene-ethylene copolymer having an ethylene content of 3.0 to 7.0 wt. % and a melt flow rate (MFR, JIS K-6557) measured at 230° C. of 2.0 to 4.0 g/10 min or (II) a beta-crystal nucleating agent; the film having a porosity of 20 to 80%, a Gurley air permeability of 5,000 sec/100 cc or lower as measured according to JIS P-8117, a water vapor permeability of 2.000 g/m