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US 12,325,960 B2Granted
Coated paper substrate suitable for metallization
AssigneeStora Enso OYJ
InventorsKaj Backfolk, Isto Heiskanen, Katja Lyytikäinen
Life of this patent
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Abstract
The present invention is directed to a coated paper substrate that is particularly suitable for metallization and other nano-coatings that provide barrier properties and are applied using vacuum deposition techniques. The invention is also directed to a process for preparing the coated paper substrate. The invention is also directed to a packaging material comprising the coated paper substrate.
Claims20
A coated paper substrate comprising:
- a paper substrate with a coated surface with a coating comprising a cellulose ether, wherein the cellulose ether is methyl nanocellulose or ethyl nanocellulose and wherein the coating has been applied as a suspension, solution, emulsion, or foam, and wherein at least 80 wt % of a solvent used in said suspension, solution, emulsion, or foam is non-aqueous,
- wherein the coated surface has a Parker Print Surf (PPS) smoothness, determined according to ISO 8791-4 at 1.0 MPa, in a range of from 0.1 to 8.0 μm, and
- wherein the paper substrate has a grammage in the range of from 15 g/m2 to 100 g/m2.
A method of manufacturing a coated paper substrate, the method comprising the steps of:
- a) providing a paper substrate having a grammage in a range from 15 g/m2 to 100 g/m2,
- b) coating the paper substrate of step a) with a coating comprising cellulose ether, wherein the cellulose ether is methyl nanocellulose or ethyl nanocellulose, applied as a suspension, solution, emulsion, or foam, and wherein at least 80 wt % of a solvent used in said suspension, solution, emulsion, or foam is non-aqueous, as on at least one side of the paper substrate to obtain a coated paper having at least one coated surface having a Parker Print Surf (PPS) smoothness, determined according to ISO 8791-4 at 1.0 MPa, in a range of from 0.1 to 8.0 μm.
Dependencies are inferred from the claim text.