MULTILAYERED SEALANT FILM AND COMPOSITE PACKING MATERIAL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a sealant film having the same thickness and lamination constitution of a conventional sealant film and excellent in impact strength. SOLUTION: A multilayered sealant film consists of a base material layer and the seal layer laminated to at least the single surface thereof. The base material layer is composed of LLDPE being a below 6Cα-olefin/ethylene copolymer and having density of 0.910-0.930g/cm<3> . The seal layer is composed of LLDPE having density of 0.885-0.920g/cm<3> and an Mw/Mn value of 1.5-3 and characterized by that a crystal fusion peak is single at crystal fusion temp. measured by DCS and a temp. width from the start of fusion of all crystals of the film to the completion thereof is within 20 deg.C. The thickness ratio of the base material layer and the seal layer is 2/1-1/10.