| 摘要 |
PURPOSE:To obtain a film excellent in easy tear properties and heat sealability by prescribing a draw ratio at the time of the molding of the film in a laminated film consisting of a specific high density polyethylene layer and a layer composed of straight chain low density polyethylene due to specific copolymerization. CONSTITUTION:A laminated film contains a layer composed of high density polyethylene with M1=0.02-20g/10min and d=0.940-0.970g/cm<2> and a layer composed of straight chain low density polyethylene due to copolymerization of ethylene and 1-butene with M1=0.1-30g/10min and d=0.900-0.945g/cm<2>. Herein, the draw ratio of the film at the time of molding is set to 5-50. When the draw ratio is below 5, slight tear properties are obtained but no satisfactory tear properties are obtained. When the draw ratio exceeds 50, tear properties become well but the physical, properties of the film such as impact resistance lower. |
