| 摘要 |
PURPOSE:To improve low-temperature shock resistance, tear resistance and fusion sealing properties while enhancing workability by using a specific propylene group copolymer and specific straight-chain low-density polyethylene and co-extruding the copolymer and polyethylene by constitution within a fixed range. CONSTITUTION:A layer in which a 5-100pts.wt. crystalline propylene group random copolymer having a crystalline melting point of 150 deg.C or less is mixed with 100pts.wt. straight chain-shaped low-density polyethylene having density of 0.925 or less is used as an A layer, a layer composed of a crystalline propylene group polymer or copolymer is employed as a B layer, and a layer consisting of the crystalline propylene group random copolymer is used as a C layer. A laminated film in which the A layer is employed as a core layer and the B and C layers are laminated onto both surfaces of the core layer is manufactured. The laminated film is produced through a co-extrusion laminating method, in which these layers are melt-extruded by using a plurality of extruders, laminated under the state of melting and cooled by a water tank, a cooling roll, etc., at that time. |
