POLYPROPYLENE FILM AND LAYERED PRODUCT THEREOF

摘要

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/cm 3 and a melt flow rate of 5-30 g/10 min; the polymer (c) is an ethylene/±-olefin random copolymer having a density of 0.86-0.90 g/cm 3 and 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). The film is good in transparency and see-through property and is free from the problem of white crease by folding. It is suitable for use in ordinary retort applications as a packaging bag or a sealant for packaging bags. A film having low-temperature impact resistance, heat sealability and blocking resistance and a laminated material thereof are further provided.