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US 12,734,785 B2Granted
Laminates
AssigneeStora Enso OYJ
InventorsKaj Backfolk, Isto Heiskanen, Jukka Kankkunen, Anna Nyberg Zetterlund
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Abstract
The present invention relates to packaging materials in the form of laminates comprising a paper or paperboard substrate and a barrier film. The barrier film is based on microfibrillated cellulose. The laminate comprises a paper or paperboard substrate, wherein the substrate is in contact with a first adhesive layer, which is in contact with a second adhesive layer, which is in contact with the barrier film. The present invention also relates to methods for manufacturing such laminates.
Claims10
A laminate comprising:
- a paper or paperboard substrate, wherein the paper or paperboard substrate is in contact with a first adhesive layer, which is in contact with a second adhesive layer, which is in contact with a barrier film, said barrier film comprising at least 50 wt-% microfibrillated cellulose (MFC),
- wherein a basis weight of the barrier film is in a range of from 15 to 80 gsm,
- wherein the first adhesive is a terpolymer-based adhesive or a styrene/acrylate emulsion, said first adhesive having a glass transition temperature in the range of between −20° and 60° C., and,
- wherein the second adhesive is a terpolymer-based adhesive or a styrene/acrylate emulsion, said second adhesive having a glass transition temperature higher than 30° C.,
- wherein the barrier film, before applying any adhesive, has PPS10 roughness larger than 1.5 μm, and,
- the barrier film, before applying any adhesive, has a Gurley Hill porosity value, determined according to ISO 5636/6, of at least 10000 s/100 ml.
3 more elements
Dependencies are inferred from the claim text.