Patent ID: 7008501
Filing Date: 2006-03-07
Classification: B32B,Y10T

Abstract:
1. A process for preparing a composite film comprising coextruding polyethylene terephthalate (PET) and polyethylene-2,6-naphthalate (PEN) to form a film of polyethylene terephthalate coated directly on at least one side with polyethylene-2,6-naphthalate and depositing directly on the PEN of at least one of the at least one PEN-coated side a ceramic layer of SiO x , where x is a number between 0.9 and 2, by means of thin-film vacuum process through the simultaneous vaporization of silicon dioxide (SiO 2 ) and metallic silicon, or by the vaporization of silicon monoxide (SiO) in a vacuum, each of said at least one ceramic layer of SiO x having a thickness of 10 nm to 200 nm, the composite film has good permeability barrier for water vapor and gases after sterilization in a water bath or in water vapor at a temperature of more than 90° C.