Porous polypropylene film, process for producing the same, and absorbent article employing the film

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-6857) measured at 230° C. of 2.0 to 4.0 g/10 min or
• (ii) a polypropylene-based resin mixture containing a propylene-ethylene copolymer, the mixture having an ethylene content of 3.0 to 7.0 wt. % and a melt flow rate (MFR, JIS K-6857) measured at 230° C. of 2.0 to 4.0 g/10 min and
• (II) a β-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/m2 ·24h or higher as measured according to JIS Z-0208 and a water pressure resistance of 75 kPa or higher as measured according to JIS L-1092 except that an aqueous surfactant solution is used instead of pure water.