摘要 |
<P>PROBLEM TO BE SOLVED: To provide a food preserving method using a packaging material excellent in various gas barrier properties, heat resistance, acid resistance, moistureproof properties, heat sealability, transparency and the like, having the filling and packaging properties, preservation properties or the like of content, not causing the discoloration of a laminated film after boiling treatment or retorting treatment and the lowering of lamination strength after long-term preservation and extremely excellent in environmental properties, economical efficiency or the like. <P>SOLUTION: In the food preserving method, food is hermetically sealed using a gas barrier laminated film including an outer layer comprising a thermoplastic resin, an inner layer comprising a thermoplastic resin having heat sealability and an adhesive layer formed using a laminating adhesive based on a polyurethane resin composition. A specific skeletal structure is contained in a polyurethane resin cured material formed of the polyurethane resin composition in an amount of 20 wt.% or above. <P>COPYRIGHT: (C)2005,JPO&NCIPI |