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Polyolefin resin compositions and oriented microporous films prepared from same comprising an ethylene-propylene block copolymer having an ethylene content of about 10 to about 50 wt %, a propylene homopolymer or random propylene copolymer having up to about 10 wt % of a comonomer of ethylene or an

Polyolefin resin compositions and oriented microporous films prepared from same comprising an ethylene-propylene block copolymer having an ethylene content of about 10 to about 50 wt %, a propylene homopolymer or random propylene copolymer having up to about 10 wt % of a comonomer of ethylene or an a

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A polymeric composition for the manufacture of films comprising, about 30 to about 95 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 70 to about 5 parts by weight of a component B comprising a propylene

A polymeric composition for the manufacture of films comprising, about 30 to about 95 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 70 to about 5 parts by weight of a component B comprising a propylene homopolymer or random copolymer having up to about 10 wt % of a comonomer of ethylene or an a4 to 8 carbon atoms, about 5 to about 20 parts by weight, per 100 parts by weight of components A and B, 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-1 and 190°C., and about 0.01 to about 50 ppm, by weight of components A and B, of a component E comprising a beta-spherulite nucleating agent.