Patent ID: 8383221

Claim:
A multilayer film having at least three layers comprising a first layer comprising a polymer selected from the group consisting of polyvinyl chloride, copolymers made of vinyl chloride units and of one or more other monomers, polyethylene terephthalate, polyolefins, polyacrylonitrile, copolymers made of acrylonitrile units and of one or more other monomers, and mixtures made of polyvinyl chloride and of copolymers made of vinyl chloride units and one or more other monomers; a second layer comprising a vinylidene chloride copolymer selected from the group consisting of polyvinylidene chloride, copolymers made of vinylidene chloride units and of one or more other monomers, and mixtures made of polyvinylidene chloride and of copolymers made of vinylidene chloride units and one or more other monomers; and a third layer comprising a chlorotrifluoroethylene polymer selected from the group consisting of polychlorotrifluoroethylene, copolymers made of chlorotrifluoroethylene units and of one or more other monomers, and mixtures made of polychlorotrifluoroethylene and copolymers made of chlorotrifluoroethylene units, wherein said film has an oxygen transmission of from 0.10 to 0.22 cm 3 /(m 2 ·24 h), at a temperature of 23° C. and at a relative humidity of 50%.