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US 12,000,091 B2Granted
Polymer coated paper and paperboard
AssigneeStora Enso OYJ
InventorsVille Ribu, Kimmo Nevalainen
Life of this patent
Estimating the term…
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.
Claims16
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.
2 more elements
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.
5 more elements
Dependencies are inferred from the claim text.