Packaging laminate with gas and aroma barrier properties

A packaging laminate consisting of two prefabricated laminates and an intermediate adhesive layer, wherein:

• a. the first prefabricated laminate consists of a plastic substrate film coated on both sides with a layer of SiOxCy , in which x is within the range of 1.7–2.1 and y is within the range of 0.39–0.47, having a thickness of 5 to 500 Å, wherein at least one of the SiOxCy layers is formed by vapor deposition on the substrate film by a plasma enhanced chemical vapor deposition method while stretching the substrate film, wherein the SiOxCy layers have a cohesion strength of at least 5.7 GPa, and wherein the SiOxCy layers have an interface shear strength with the plastic substrate film of at least 170 MPa;
• b. the second prefabricated laminate comprises a core layer coated on both sides with a layer of thermoplastic polymer heat-sealable within the range of 121°–260°C.;
• and
• c. the second prefabricated laminate is bonded to one side of the first prefabricated laminate by an intermediate adhesive layer.

A packaging container consisting of a laminate shaped to form the packaging container, said laminate consisting of two prefabricated laminates and an intermediate adhesive layer, wherein:

• a. the first prefabricated laminate consists of a plastic substrate film coated on both sides with a layer of SiOxCy, in which x is within the range of 1.5–2.2 and y is within the range of 0.15–0.80, wherein the SiOxCy layers have a cohesion strength of at least 5.7 GPa, and wherein the SiOxCy layers have an interface shear strength with the plastic substrate film of at least 170 MPa;
• b. the second prefabricated laminate comprises a core layer coated on both sides with a layer of heat-sealable thermoplastic polymer;
• and
• c. the second prefabricated laminate is bonded to one side of the first prefabricated laminate by an intermediate adhesive layer;
• wherein at least one of the SiOxCy layers is formed by vapor deposition on the substrate film by a plasma enhanced chemical vapor deposition method while stretching the substrate film within a range between an upper limit defined by a point of an initial plastic deformation of the substrate film determined by the Young modulus, and a lower limit defined by a point of any improvement of the cohesion force of the oxide coating and the adhesion force between the oxide coating and the substrate film.

A package blank having crease lines and consisting of a packaging laminate, said laminate consisting of two prefabricated laminates and an intermediate adhesive layer, wherein:

• a. the first prefabricated laminate consists of a plastic substrate film coated on both sides with a layer of SiOxCy, in which x is within the range of 1.5–2.2 and y is within the range of 0.15–0.80, wherein at least one of the SiOxCy layers is formed by vapor deposition on the substrate film by a plasma enhanced chemical vapor deposition method while stretching the substrate film, wherein the SiOxCy layers have a cohesion strength of at least 5.7 GPa;
• b. the SiOxCy layers have at least 170 MPa of interface share strength with the substrate film;
• c. the second prefabricated laminate comprises a core layer coated on both sides with a layer of heat-sealable thermoplastic polymer;
• and
• d. the second prefabricated laminate is bonded to one side of the first prefabricated laminate by an intermediate adhesive layer.