Propylene-based blown films with improved performance,...

Details Propylene-based blown films with improved performance,... Propylene-based blown films with improved performance,...

2009-12-22

2011-11-29

Nutter, Nathan M (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S232000, C525S240000

Reexamination Certificate

active

08067501

ABSTRACT:
A thermoplastic composition for cast and blown films and the resulting films thereof are provided. The film can include about 10 wt % to 80 wt % propylene-based copolymer having at least 50 wt % propylene-derived units and 5 wt % to 30 wt % alpha-olefin comonomer, based on the total weight of the polymer that exhibits a melting point of about 100° C. to 170° C., and a MFR of about 200 dg/min or less. The film can include about 20 wt % to 90 wt % polypropylene homopolymer having a melting point of about 140° C. to 190° C. The film can have a thickness of about 10 μm to 100 μm, a haze of 13% or less, a 1% MD Secant tensile modulus of 55,000 to 150,000 psi, a machine direction Elmendorf tear of at least 5 g/mil and a transverse direction Elemdorf tear of at least 300 g/mil, and a 45 degree gloss of at least 70.

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