Patent ID: 7435480

Claim:
A laminated film for an infusion solution bag which comprises a heat-resistant resin layer composed of a polyester film or a biaxially stretched polyamide film, an oxygen gas barrier layer formed by a membrane of one of aluminum oxide and silicon oxide or a coating layer of polyvinylidene chloride and poly(metha)acrylic acid/sugar, an adhesive layer composed of a mixture of an ethylene-unsaturated carboxylic acid anhydride-unsaturated carboxylic acid ester copolymer, an ethylene-unsaturated carboxylic acid ester copolymer or an ethylenevinyl ester copolymer and a polyolefin having a melting point of at least 100° C. and a sealant layer formed from a combination of a high density polyethylene layer and a linear low density polyethylene layer, one of the heat-resistant resin layer and the oxygen gas barrier layer is the outermost layer, the sealant layer is the innermost layer, one of the heat-resistant resin layer and the oxygen gas barrier layer is laminated with the sealant layer through the adhesive resin layer by thermal lamination and the high density polyethylene layer is the innermost layer of the sealant layer.