Patent ID: 6652957
Filing Date: 2003-11-25
Classification: B32B,Y10T

Abstract:
A composite film for packaging purposes that retains effective permeability barrier effect for water vapor and gases after sterilization in a water bath or in water vapor at a temperature of more than 90Â° C., where the composite film also has a substantial constituent a barrier layer with SiOx produced by the vaporization of inorganic materials, the composite film comprises a film of polyethylene terephthalate (PET) with a coextruded layer of polyethylene-2,6-naphthalate (PEN) on at least one side and the film on at least one of the PEN-coated sides has a 10 nm to 200 nm thick ceramic layer of SiOx, where x is a number between 0.9 and 2, produced by the simultaneous vaporization of silicon dioxide (SiO2) and metallic silicon or by the vaporization of silicon monoxide (SiO) in a vacuum.