| 摘要 |
<p>PURPOSE:To keep the impact strength and the unsealing property well-balanced by having on a base material an extrusion-coated layer of a composition comprising specific ethylene-pentene-1 copolymer and specific high-pressure polyethylene. CONSTITUTION:A film which comprises having on a base material an extrusion- coated layer of a composition comprising; 99 to 30wt% of an ethylene-pentene-1 copolymer copolymerizing ethylene and pentene-1, having a melt flow rate of 1 to 50g/10min and a density of 0.890 to 0.940g/cm<2>, containing 1 to 25wt% of a building block derived from pentene-1 in terms of a monomer and satisfying PS>=-2iogMFR-1000d+968 which represents a ratio (PS) of the impact strength of a 40mum thick film obtained by molding the copolymer according to the cast film process to the tearing strength of that film in the take-off direction (MFR is a melt flow rate of the copolymer and d is a density of the copolymer); and 1 to 70wt% of high pressure polyethylene having a melt flow rate of 1 to 70g/10min. In the so obtained film, the film release property can be improved without unbalancing the impact property and the unsealing property.</p> |
