Sterilizable multilayer film for packaging

摘要

Laminated packaging film with a good gas-barrier action after sterilization in hot water or steam comprises coextruded polyethylene terephthalate (PET)-polyethylene 2,6-naphthalate (PEN) film, with a barrier layer of aluminum oxide or silicon oxide vacuum-deposited on the PEN. Laminated film for packaging applications, with a good barrier action against water vapour and gases after sterilization in water or steam at above 90 degrees C. This laminate comprises polyethylene terephthalate (PET) film with a coextruded layer of polyethylene 2,6-naphthalate (PEN) on at least one side and a vacuum deposited layer of aluminum oxide (Al2O3) or silicon oxide (SiOx) on at least one of the PEN-coated sides, with x = 0.9-2 . An Independent claim is also included for a process for the production of laminated packaging film by coating at least one of the PEN sides of a PEN-coated PET film with a layer of Al2O3 or SiOx ceramic as above by means of a thin-film vacuum-coating technique and then laminating the resulting coated film with other films as required.