# US 2025/0207331 A1 · A method for manufacturing a vacuum coated paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0207331 A1 - Document ID: US20250207331A1 - Status: Published application - Kind: A1 - Application number: 18/851,730 - Filed: 2023-03-28 - Published: 2025-06-26 - Earliest claimed: 2022-03-31 - Assignees: Stora Enso OYJ - Applicants: Stora Enso OYJ - Inventors: Kaj Backfolk; Isto Heiskanen; Cecilia Land Hensdal - Web page: https://patentgrep.com/patent/US20250207331A1 ## CPC - D21H 19/08: applied as vapour, e.g. in vacuum - C23C 14/20: on organic substrates - D21H 19/36: Coatings with pigments (D21H19/66 takes precedence; metal powder D21H19/06) - D21H 19/54: Starch - D21H 19/56: Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds - D21H 19/64: Inorganic compounds - D21H 19/82: superposed {(D21H19/84 takes precedence)} - D21H 19/84: on both sides of the substrate - D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38) - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract The present invention relates to a method for manufacturing a vacuum coated paper, said method comprising: a) providing a paper substrate, wherein said paper substrate comprises 0.3-60 kg/ton of a humectant, based on the total dry weight of the paper substrate, b) applying a precoat layer to the paper substrate, and c) applying a vacuum coating layer to the precoat layer to obtain a vacuum coated paper. The present invention further relates to a vacuum coated paper. ## Claims ### Claim 1 A method for manufacturing a vacuum coated paper, said method comprising: a) providing a paper substrate, wherein said paper substrate comprises 0.3-60 kg/ton of a humectant, based on a total dry weight of the paper substrate, b) applying a precoat layer to the paper substrate, and c) applying a vacuum coating layer to the precoat layer to obtain a vacuum coated paper. ### Claim 2 (depends on 1) The method according to claim 1, wherein the paper substrate has a grammage in the range of 20-150 g/m2. ### Claim 3 (depends on 1) The method according to claim 1, wherein the paper substrate further comprises a mineral filler in an amount of 1-30 wt %, based on the total dry weight of the paper substrate. ### Claim 4 (depends on 1) The method according to claim 1, wherein the paper substrate has a Gurley Hill value below 5000 s/100 ml, as measured according to standard ISO 5636-5. ### Claim 5 (depends on 1) The method according to claim 1, wherein the paper substrate has a water vapor transmission rate (WVTR), measured according to the standard ASTM F1249-90 at 50% relative humidity and 23° C., of above 200 g/m2/24 h. ### Claim 6 (depends on 1) The method according to claim 1, wherein the paper substrate is surface sized on one or two sides with a surface sizing composition. ### Claim 7 (canceled) ### Claim 8 (depends on 6) The method according to claim 6, wherein a grammage of the surface sizing composition is 0.2-10 g/m2, based on dry weight. ### Claim 9 (depends on 1) The method according to claim 1, wherein said paper substrate comprises 0.5-50 kg/ton, of the humectant, based on the total dry weight of the paper substrate. ### Claim 10 (depends on 1) The method according to claim 1, wherein the humectant is selected from a group consisting of: low molecular weight polyols, sugar alcohols, metal salts, and combinations thereof. ### Claim 11 (depends on 1) The method according to claim 1, wherein the humectant is comprises a sugar alcohol. ### Claim 12 (depends on 1) The method according to claim 1, wherein the humectant is a metal salt. ### Claim 13 (depends on 1) The method according to claim 1, wherein the humectant is present in bulk of the paper substrate, or at a surface of the paper substrate, or both. ### Claim 14 (canceled) ### Claim 15 (depends on 1) The method according to claim 1, wherein the precoat layer comprises a polymer selected from a group consisting of: a polyvinyl alcohol (PVOH), a polyurethane, a polysaccharide, and combinations thereof. ### Claim 16 (depends on 1) The method according to claim 1, wherein the precoat layer comprises at least 50 wt % of a PVOH, based on a total dry weight of the precoat layer. ### Claim 17 (canceled) ### Claim 18 (depends on 1) The method according to claim 1, wherein a grammage of the precoat layer is in a range of 1-20 g/m2, based on dry weight. ### Claim 19 (depends on 1) The method according to claim 1, wherein the vacuum coating layer is applied to the precoat layer by physical vapor deposition (PVD) or chemical vapor deposition (CVD). ### Claim 20 (depends on 1) The method according to preceding claim 1, wherein the vacuum coating layer is an inorganic vacuum coated layer. ### Claim 21 (depends on 1) The method according to claim 1, wherein the vacuum coating layer comprises a metal or metal oxide selected from a group consisting of: aluminum, magnesium, silicon, copper, aluminum oxides, magnesium oxides, silicon oxides, and combinations thereof. ### Claim 22 (depends on 1) The method according to claim 1, wherein the vacuum coating layer is an organic vacuum coated layer. ### Claim 23 (canceled) ### Claim 24 (depends on 1) The method according to claim 1, wherein the vacuum coating layer has a thickness in a range of 10-600 nm. ### Claim 25 (depends on 1) The method according to claim 1, wherein the vacuum coated paper has an oxygen transmission rate (OTR), measured according to the standard ASTM F1927-98 at 50% relative humidity and 23° C., of less than 10 cc/m2/24 h. ### Claim 26 (depends on 1) The method according to claim 1, wherein the vacuum coated paper has a water vapor transmission rate (WVTR), measured according to the standard ASTM F1249-90 at 50% relative humidity and 23° C., of less than 10 g/m2/24 h. ### Claim 27 A vacuum coated paper comprising: a paper substrate, a precoat layer, and a vacuum coating layer, wherein the precoat layer is arranged between and in contact with the paper substrate and the vacuum coating layer, and wherein said paper substrate comprises 0.3-60 kg/ton of a humectant, based on a total dry weight of the paper substrate. ### Claim 28 (canceled) ### Claim 29 (canceled) ### Claim 30 (canceled) ### Claim 31 (canceled) ### Claim 32 (canceled) ### Claim 33 (canceled)