HEAT-SEALING MATERIAL FOR EASILY OPENABLE VESSEL, AND EASILY OPENABLE VESSEL USING IT

摘要

PROBLEM TO BE SOLVED: To provide a heat-sealing material which has enough sealing power and can form a heat-resistant heat-sealed part easily openable in opening and an easily openable vessel using the material. SOLUTION: The heat-sealing material contains a modified propylene polymer obtained by grafting 70-5 wt.% vinyl monomer onto 30-95 wt.% propylene polymer. This propylene polymer comprises 10-60 wt.% component (i) and 90-40 wt.% component (ii), component (ii) being formed by polymerization after the polymerization for component (i). Component (i) is a propylene homopolymer with an isotactic index of 90% or higher or a copolymer of propylene and anotherα-olefin; component (ii) is a copolymer prepared from ethylene, propylene, and if necessary anotherα-olefin and has a content of room-temperature xylene-solubles of 10-60 wt.% based on the propylene polymer. The easily openable vessel is obtained by using the heat-sealing material. COPYRIGHT: (C)2004,JPO&NCIPI