# US 12,000,091 B2 · Polymer coated paper and paperboard > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,091 B2 - Document ID: US12000091B2 - Status: Granted - Kind: B2 - Application number: 17/282,073 - Filed: 2019-10-01 - Published: 2021-10-14 - Granted: 2024-06-04 - Earliest claimed: 2018-10-04 - Assignees: Stora Enso OYJ - Applicants: Stora Enso OYJ - Inventors: Ville Ribu; Kimmo Nevalainen - Web page: https://patentgrep.com/patent/US12000091B2 ## CPC - D21H 19/28: Polyesters - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/08: of synthetic resin - B32B 27/10: of paper or cardboard - B32B 27/20: using fillers, pigments, thixotroping agents - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 27/36: comprising polyesters - B32B 29/00: Layered products comprising {a layer of} paper or cardboard - B32B 29/002: {as the main or only constituent of a layer, which is next to another layer of the same or of a different material (next to a layer of a particular substance B32B9/06; next to a bituminous or tarry layer B32B11/06; next to a water-setting substance layer B32B13/08; next to a metal layer B32B15/12; next to a glass layer B32B17/065; next to a layer formed of natural mineral fibres or particles B32B19/046; next to a wood layer B32B21/06; next to a cellulosic plastic layer B32B23/06; next to a natural or synthetic rubber layer B32B25/06; next to a synthetic resin layer B32B27/10)} - B32B 29/08: Corrugated paper or cardboard - C09D 167/025: {containing polyether sequences} - D21H 19/20: comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds - D21H 19/22: Polyalkenes, e.g. polystyrene - D21H 19/62: Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds - D21H 19/82: superposed {(D21H19/84 takes precedence)} - D21H 19/826: {two superposed coatings, the first applied being pigmented and the second applied being non-pigmented} - B29C 48/00: Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) - B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers - B32B 2307/306: Resistant to heat - B32B 2307/31: Heat sealable - B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes - B32B 2307/5825: Tear resistant - B32B 2307/718: Weight, e.g. weight per square meter - B32B 2307/7244: Oxygen barrier - B32B 2307/7246: Water vapor barrier - B32B 2439/02: Open containers - C08G 63/672: Dicarboxylic acids and dihydroxy compounds - C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) - 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 - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract The present invention relates to paper or paperboard comprising at least one coating layer formed by extrusion coating of a PET (polyethylene terephthalate) resin, characterized in that the PET resin comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity of less than 0.7 dl/g, preferably less than 0.65 dl/g, as determined according to ISO 1628. ## Claims ### Claim 1 A paper or paperboard comprising: at least one coating layer formed by extrusion coating of a PET (polyethylene terephthalate) resin, wherein the PET resin comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity in a range of from 0.57 to 0.61 dl/g, as determined according to ISO 1628, wherein said PET copolymer is a PET copolymer comprising repeating units of terephthalic acid, isophthalic acid, monoethylene glycol, and diethylene glycol, wherein a molar ratio of terephthalic acid:isophthalic acid in said PET copolymer is in a range of from 99:1 to 50:50, wherein a molar ratio of monoethylene glycol:diethylene glycol in said PET copolymer is in a range of from 99:1 to 50:50. ### Claim 2 (depends on 1) The paper or paperboard according to claim 1, wherein said PET resin comprises at least 70% by weight of said PET copolymer. ### Claim 3 (depends on 1) The paper or paperboard according to claim 1, wherein a remainder of the PET resin is comprised of a PET having an intrinsic viscosity 0.7 dl/g or higher, as determined according to ISO 1628. ### Claim 4 (depends on 1) The paper or paperboard according to claim 1, wherein the PET resin is applied to a substrate at a grammage of less than 50 g/m2. ### Claim 5 (depends on 1) The paper or paperboard according to claim 1, wherein the PET resin comprises at least one additional component selected from the group consisting of a polymer other than a PET, a pigment, a dye, and a filler. ### Claim 6 (depends on 1) The paper or paperboard according to claim 1, further comprising: at least one additional polymeric coating layer disposed on top of the extrusion coated PET resin, wherein the additional polymeric coating layer has a composition different from the extrusion coated PET resin. ### Claim 7 (depends on 6) The paper or paperboard according to claim 6, wherein said at least one additional coating layer comprises polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polylactic acid (PLA), or a combination thereof. ### Claim 8 (depends on 6) The paper or paperboard according to claim 6, wherein said at least one additional coating layer is formed by extrusion coating or by extrusion film lamination. ### Claim 9 (depends on 6) The paper or paperboard according to claim 6, further comprising: at least two additional polymeric coating layers disposed on top of the extrusion coated PET resin, wherein at least one of the at least two additional polymeric coating layers has a composition different from the extrusion coated PET resin, and wherein an outermost layer of the at least two additional polymeric coating layer comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity of less than 0.7 dl/g, as determined according to ISO 1628. ### Claim 10 (depends on 1) An ovenable tray comprising paper or paperboard according to claim 1. ### Claim 11 A method for manufacturing a PET resin coated paper or paperboard substrate, comprising: a) providing paper or paperboard substrate, b) applying at least one layer of molten PET resin to a surface of said substrate by extrusion coating, c) allowing the PET resin to cool down and solidify, and d) recovering the PET resin coated substrate, wherein the PET resin comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity (IV) in a range of from 0.57 to 0.61 dl/g, as determined according to ISO 16282, wherein said PET copolymer is a PET copolymer comprising repeating units of terephthalic acid, isophthalic acid, monoethylene glycol, and diethylene glycol, wherein a molar ratio of terephthalic acid:isophthalic acid in said PET copolymer is in a range of from 99:1 to 50:50, wherein a molar ratio of monoethylene glycol:diethylene glycol in said PET copolymer is in a range of from 99:1 to 50:50. ### Claim 12 (depends on 11) The method according to claim 11, further comprising: applying at least one additional polymeric coating layer disposed on top of the extrusion coated PET resin, wherein the additional polymeric coating layer has a composition different from the extrusion coated PET resin. ### Claim 13 (depends on 12) The method according to claim 12, wherein said at least one additional coating layer comprises polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polylactic acid (PLA) or a combination thereof. ### Claim 14 (depends on 12) The method according to claim 12, wherein said at least one additional coating layer is formed by extrusion coating or by extrusion film lamination. ### Claim 15 (depends on 12) The method according to claim 12, wherein at least two additional polymeric coating layers are applied on top of the extrusion coated PET resin, wherein at least one of the additional polymeric coating layers has a composition different from the extrusion coated PET resin, and wherein the outermost additional polymeric coating layer comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity of less than 0.7 dl/g, as determined according to ISO 1628. ### Claim 16 (depends on 12) The method according to claim 12, wherein the outermost additional polymeric coating layer comprises at least 50% by weight of a PET copolymer having an intrinsic viscosity of less than 0.65 dl/g, as determined according to ISO 1628.