Patent ID: 8708992

Claim:
A plastic film used for a medical container which is composed at least of four layers, formed by a water-cooling inflation method of co-extrusion, and has an oxygen absorbing function, comprising in order from an outermost layer: a first layer that contains a polyamide obtained from a ring-opening polymerization of a lactam having 11 or more carbon atoms or from polycondensation of an ω-amino acid having 11 or more carbon atoms, or a polyamide obtained from copolycondensation of a dicarboxylic acid having 10 or more carbon atoms and a diamine having 6 or more carbon atoms, wherein the first layer is the outermost layer; a second layer that is adjacent to the first layer and contains as the main component an ethylene vinyl alcohol copolymer and as accessory components a transition metal salt and a polyene-based polymer having an unsaturated double bond; a third layer that is adjacent to the second layer and contains a copolymer of an α-olefin and a monomer of an unsaturated carboxylic acid or an anhydride of an unsaturated dicarboxylic acid as the major component; and a sealing layer that contains a polyethylene as the main component.