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US 7,008,501 B2Granted
Sterilisable composite film for packaging purposes
AssigneeAlcan Technology & Management Ltd.
InventorsWolfgang Lohwasser, Olaf Frei
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AssigneeAlcan Technology & Management Ltd.
InventorsWolfgang Lohwasser, Olaf Frei
Estimating the term…
The process for preparing a composite film for packaging purposes, that includes coextruding polyethylene terephthalate (PET) and polyethylene-2, 6-naphthalate (PEN) to form a film of polyethylene-2,6-naphthalate. On at least one of the at least one PEN-coated side, a ceramic layer of SiOx, where x is number between 0.9 and 2, is deposited by means of the thin-film vacuum process through the simultaneous vaporization of silicon dioxide (SiO2) and metallic silicon, or by the vaporization of silicon monoxide (SiO) in a vacuum. Each of the at least one ceramic layers of SiOx having a thickness of 10 nm to 200 nm. The resultant composite film 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 90° C.
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 SiOx, where x is a number between 0.9 and 2, by means of thin-film vacuum process through the simultaneous vaporization of silicon dioxide (SiO2) and metallic silicon, or by the vaporization of silicon monoxide (SiO) in a vacuum, each of said at least one ceramic layer of SiOx 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.
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 on at least one side with polyethylene-2,6-naphthalate, subjecting surface of each of the at least one PEN coating on the PET film to plasma pre-treatment and depositing directly on the PEN of at least one of the at least one PEN-coated side a ceramic layer of SiOx, where x is a number between 0.9 and 2 by means of thin-film vacuum process through the simultaneous vaporization of silicon dioxide (SiO2) and metallic silicon, each of said at least one ceramic layer of SiOx 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 a water vapor at a temperature of more than 90° C.
Dependencies are inferred from the claim text.