Polypropylene film and laminated material thereof

Details Polypropylene film and laminated material thereof Polypropylene film and laminated material thereof

2005-11-28

2010-06-08

Dye, Rena L (Department: 1794)

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

C428S035300, C428S461000, C525S240000, C426S112000, C426S113000, C426S114000

Reexamination Certificate

active

07732027

ABSTRACT:
A polypropylene film comprising 70-90 wt. % polymer (a), 2-10 wt. % polymer (b), 2-10 wt. % polymer (c) and 3-20 wt. % polymer (d) and having a haze of 8-30% (wherein the polymer (a) is a block copolymer prepared by producing a polymer part (component a1) by polymerizing in a first step monomers composed mainly of propylene in the absence of an inert solvent and producing an ethylene/propylene copolymer part (component a2) in a second step by polymerization subsequently carried out in a gas phase; the polymer (b) is an ethylene-based polymer having a density of 0.91-0.97 g/cm3and a melt flow rate of 5-30 g/10 min; the polymer (c) is an ethylene/α-olefin random copolymer having a density of 0.86-0.90 g/cm3and a melt flow rate of 0.3-5 g/10 min; and the polymer (d) comprises two or more propylene-based polymers different in molecular weight from each other).

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