US 12,000,091 B2
Polymer coated paper and paperboard
Ville Ribu, Lappeenranta (FI); and Kimmo Nevalainen, Kotka (FI)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 17/282,073
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Oct. 1, 2019, PCT No. PCT/IB2019/058325
§ 371(c)(1), (2) Date Apr. 1, 2021,
PCT Pub. No. WO2020/070632, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 1851198-0 (SE), filed on Oct. 4, 2018.
Prior Publication US 2021/0317612 A1, Oct. 14, 2021
Int. Cl. D21H 19/28 (2006.01); C09D 167/02 (2006.01)
CPC D21H 19/28 (2013.01) [C09D 167/02 (2013.01)] 16 Claims
 
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.