Gas barrier film for packaging material
AssigneeStora Enso OYJ
InventorIsabel Knöös
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Abstract
The present invention relates to a gas barrier film for a paper or paperboard based packaging material, said gas barrier film comprising: a microfibrillated cellulose layer (MFC layer), at least one surface of which has been grafted with a fatty acid halide; and a polymer layer disposed on the at least one surface of the MFC layer which has been grafted with a fatty acid halide. The present invention further relates to a paper or paperboard based packaging material, containers and carton blanks comprising the gas barrier film, and to a method for manufacturing the gas barrier film.
Claims21
A gas barrier film for a paper or paperboard based packaging material, said gas barrier film comprising:
- a microfibrillated cellulose layer (MFC layer), at least one surface of which has been grafted with a fatty acid halide;
- and
- a polymer layer disposed on the at least one surface of the MFC layer which has been grafted with a fatty acid halide.
A method for manufacturing a gas barrier film for a paper or paperboard based packaging material, comprising the steps of:
- a) providing a layer of microfibrillated cellulose (MFC layer);
- b) subjecting a surface of the MFC layer to grafting with a fatty acid halide;
- and,
- c) applying a polymer layer to the surface of the MFC layer which has been grafted with the fatty acid halide.
Dependencies are inferred from the claim text.