Porous film composites

A porous film composite comprising,

• at least one layer of an oriented microporous film having microvoid cells and interconnecting pores between the cells prepared by a process comprising the steps of:
• (1) forming a film from a polymeric composition comprising,
• about 30 to about 90 parts by weight of a component A comprising an ethylene-propylene block copolymer having an ethylene content of about 10 to about 50 wt %,
• about 5 to about 40 parts by weight of a component B comprising a polypropylene homopolymer or random copolymer of propylene having up to about 10 wt % of a comonomer of ethylene or an .alpha.-olefin of 4 to 8 carbon atoms,
• about 1 to about 20 parts by weight of a component C comprising a low molecular weight polypropylene having a melt viscosity of about 50 to about 1,000 poise measured at a shear rate of 136 sec.sup.-1 and 190.degree. C.,
• 0 to about 30 parts by weight, per 100 parts by weight of components A, B and C, of a component D comprising calcium carbonate, and
• 0 to about 50 ppm, per 100 parts by weight of components A, B and C, of a component E comprising a beta-spherulite nucleating agent with the proviso that component C is present at
• (a) about 5 to about 20 parts by weight when the polymeric composition is substantially free of component D or of components D and E, and
• (b) about 1 to about 10 parts by weight when the polymeric composition has about 0.1 to about 10 ppm of component E and about 5 to about 30 parts by weight of component D,
• (2) heating said film at a temperature of about 35.degree. to about 135.degree. C., and
• (3) stretching said heated film in at least one direction at a stretch ratio of about 1.5 to about 10, wherein said oriented microporous film layer is adhered to
• at least one layer of a material selected from the group consisting of a carded web, a polymeric foam product, a woven fabric, a spunbond fabric, a meltblown fabric and a self-bonded, fibrous, nonwoven web.