Oriented polymeric microporous films
AssigneeAmoco Corporation
InventorsPhilip Jacoby, Charles W. Bauer, Scott R. Clingman, William T. Tapp
Life of this patent
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Abstract
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 .alpha.-olefin of 4 to 8 carbon atoms, a low molecular weight polypropylene, a beta-spherulite nucleating agent and an inorganic filler. The microporous films have improved breathability, strength, toughness and break elongation.
Claims7
A polymeric composition comprising,
- about 40 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 propylene homopolymer or random copolymer 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 5 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.sup.-1 and 190.degree. C.,
- about 5 to about 30 parts by weight, per 100 parts by weight of components A and B, of a component D comprising calcium carbonate, and
- about 0.1 to about 10 ppm, per 100 parts by weight of components A and B, of a component E comprising a beta-spherulite nucleating agent.
A polymeric composition 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 .alpha.-olefin of 4 to 8 carbon atoms,
- about 1 to about 10 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.sup.-1 and 190.degree. C.,
- about 5 to about 30 parts by weight, per 100 parts by weight of components A and B, of a component D comprising calcium carbonate, and
- about 0.1 to about 10 ppm, per 100 parts by weight of components A and B, of a component E comprising a beta-spherulite nucleating agent.
Dependencies are inferred from the claim text.