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,containersand cartonblanks comprising the gas barrier film, and to a method for manufacturing the gas barrier film.

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,containersand cartonblanks comprising the gas barrier film, and to a method for manufacturing the gas barrier film.

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.

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.

A paperboard blank and cup made therefrom are provided. The blank includes a paperboard substrate having a first side and a second side. A first polymer layer can be disposed on at least a portion of the first side of the paperboard substrate, and a second polymer layer can be disposed on at least a portion of the second side of the paperboard substrate. Both the first and second polymer layers can include at least one polymer component that is thermoplastic. The second polymer layer further comprises at least one polymer component, which is not present in the first polymer layer, and has a glass transition temperature higher than all the polymer components of the first polymer layer.

The invention relates to a method for the production of a heat-sealable paper that forms a barrier to water vapour, in particular having a water vapour permeability of at most 150 g/m.sup.2/24 h measured according to ASTM F1249 under so-called tropical conditions of 38 C. and 90% relative humidity, in which at least one coating layer comprising at least one thermoplastic film-forming polymer is applied in-line on the paper-making machine to the fibrous substrate.

The invention relates to a method for the production of a heat-sealable paper that forms a barrier to water vapour, in particular having a water vapour permeability of at most 150 g/m.sup.2/24 h measured according to ASTM F1249 under so-called tropical conditions of 38 C. and 90% relative humidity, in which at least one coating layer comprising at least one thermoplastic film-forming polymer is applied in-line on the paper-making machine to the fibrous substrate.

A paperboard blank and cup made therefrom are provided. The blank includes a paperboard substrate having a first side and a second side. A first polymer layer can be disposed on at least a portion of the first side of the paperboard substrate, and a second polymer layer can be disposed on at least a portion of the second side of the paperboard substrate. Both the first and second polymer layers can include at least one polymer component that is thermoplastic. The second polymer layer further comprises at least one polymer component, which is not present in the first polymer layer, and has a glass transition temperature higher than all the polymer components of the first polymer layer.

The invention relates to a method for the production of a heat-sealable paper that forms a barrier to water vapour, in particular having a water vapour permeability of at most 150 g/m.sup.2/24 h measured according to ASTM F1249 under so-called tropical conditions of 38 C. and 90% relative humidity, in which at least one coating layer comprising at least one thermoplastic film-forming polymer is applied in-line on the paper-making machine to the fibrous substrate.

The invention relates to a method for the production of a heat-sealable paper that forms a barrier to water vapour, in particular having a water vapour permeability of at most 150 g/m.sup.2/24 h measured according to ASTM F1249 under so-called tropical conditions of 38 C. and 90% relative humidity, in which at least one coating layer comprising at least one thermoplastic film-forming polymer is applied in-line on the paper-making machine to the fibrous substrate.