| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a polypropylene composite film that has excellent heat sealability and low-temperature impact resistance as a packaging bag or a sealant of a packaging bag, can be used without powder since it is excellent in blocking resistance, and can be suitably used for retort applications since it is excellent in anti-orange peel skin properties, and to provide a laminate using the polypropylene composite film.SOLUTION: A polypropylene composite film comprises a substrate layer (A) and a seal layer (B). The substrate layer (A) comprises 45-84 wt.% propylene-ethylene block copolymer (a1), 3-15 wt.% hydrogenated styrene-based thermoplastic elastomer (a2), and 10-40 wt.% low density polyethylene polymer (a3). The seal layer (B) comprises 55-85 wt.% propylene-ethylene block copolymer (b1), 5-15 wt.% propylene polymer (b2), and 10-30 wt.% mixed resin of a propylene random copolymer resin and polyethylene. Both propylene-ethylene block copolymers (a1) and (b1) contain a xylene-insoluble part at 20°C in an amount of 75-90 wt.%. The intrinsic viscosity ([η]) of the insoluble part is 1.8-2.2 dl/g. The intrinsic viscosity ([η]) of the soluble part is 2.5-3.3 dl/g.</p> |
