| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat seal film with a small fluctuation of peel strength. SOLUTION: This heat seal film is provided with a sealant layer made of a resin composition comprising (a) a block copolymer 5-50% by mass which comprises conjugated diene hydrocarbon 5-50% by mass and styrene hydrocarbon 50-95% by mass whose number average molecular weight Mn is 140,000-180,000 g/mol and number average molecular weight of styrene hydrocarbon block is between 10,000 g/mol and 50,000 g/mol, (b) an ethylene-alpha-olefin copolymer 5-50% by mass and (c) a block copolymer 5-70% by mass which comprises styrene hydrocarbon 10-50% by mass and conjugated diene hydrocarbon 90-50% by mass. COPYRIGHT: (C)2007,JPO&INPIT
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