Coated paperboard for beverage container carriers and corresponding beverage container carrier

Patent metadata

Field	Value
Publication number	US-12179980-B2
Application number	US-202118249781-A
Country	US
Kind code	B2
Filing date	Oct 19, 2021
Priority date	Oct 21, 2020
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

The invention relates to a coated paperboard ( 10 ) for beverage container carriers ( 30 ) comprising: a paperboard substrate ( 12 ), a dispersion coating layer ( 18, 20 ) on each side ( 14, 16 ) of the paperboard substrate ( 12 ), wherein the paperboard substrate ( 12 ) comprises wet strength agents in an amount in a range from ≥0 wt % to ≤0.05 wt %, based on the dry solid content of the substrate ( 12 ) and sizing agents for making the paperboard ( 12 ) substrate more hydrophobic, wherein the sizing agents are present in an amount of ≥0.15 wt %, especially in a range from ≥0.15 wt % to ≤0.5 wt %, based on the dry solid content of the substrate ( 12 ). The invention further relates to a beverage container carrier ( 30 ) comprising or being made from the aforementioned coated paperboard ( 10 ).

First claim

The invention claimed is:

1. A coated paperboard for beverage container carriers comprising:
a paperboard substrate,
a dispersion coating layer on each side of the paperboard substrate,
wherein the paperboard substrate comprises
wet strength agents in an amount in a range from ≥0 wt % to ≤0.05 wt %, based on a dry solid content of the paperboard substrate and
sizing agents for making the paperboard substrate more hydrophobic, wherein the sizing agents are present in an amount of ≥0.15 wt %, based on the dry solid content of the paperboard substrate.

2. The paperboard according to claim 1 , wherein the sizing agents are selected from a group consisting of: acidic sizing agents, basic sizing agents, neutral sizing agents or a mixture of at least two of these types.

3. The paperboard according to claim 1 , wherein the sizing agents are selected from a group consisting of: alkyl ketene dimer, alkyl succinic anhydride, rosin or a mixture thereof.

4. The paperboard according to claim 1 , wherein at least one of the dispersion coating layers is a dispersion coating layer applied in one single layer or two sub-layers.

5. The paperboard according to claim 1 , wherein at least one of the dispersion coating layers comprises latex, polyolefin, or both.

6. The paperboard according to claim 5 , wherein the latex is selected from the group consisting of: styrene-butadiene latex, styrene-acrylate latex, acrylate latex, vinyl acetate latex, vinyl acetate-acrylate latex, styrene-butadiene-acrylonitrile latex, styrene-acrylate-acrylonitrile latex, styrene-maleic anhydride latex, styrene-acrylate-maleic anhydride latex, or a mixture of any combination of these latexes.

7. The paperboard according to claim 5 , wherein the at least one dispersion coating layer further comprises pigments.

8. The paperboard according to claim 5 , wherein the at least one dispersion coating layer further comprises additives in an amount in a range ≥0.1 wt % and ≤5 wt %, wherein the additives include at least one of thickening agents, defoaming or antifoaming agents, dispersing aids, additional pigments, cross-linkers, slip additives, fillers, release agents, preservatives and antiblocking agents.

9. The paperboard according to claim 5 , wherein the at least one dispersion coating layer further comprises a cross-linker, which is an agent reacting with carboxyl, hydroxyl groups, or both.

10. The paperboard according to claim 9 , wherein the cross-linker is selected from a group consisting of: Ammonium Zirconium Carbonate, Potassium Zirconium Carbonate, Potassium Zirconium Acetate, melamine formaldehyde resin, urea formaldehyde resin, Glyoxal, Imidazoline derivatives, di-aldehyde polysaccharides and any combinations of these group members.

11. The paperboard according to claim 1 , wherein the wet strength agents comprise at least one selected from the group consisting of: urea resins, melamine resins, polyamidoamine-epichlorhydrine resins, PAM-glyoxal resins, glyoxal, glyoxal resins, and dialdehyde-starch.

12. The paperboard according to claim 1 , wherein the COBB 3600 called water absorption rate of the coated paperboard after 3600 s is ≤20 gsm.

13. The paperboard according to claim 1 , wherein the water absorption of the coated paperboard after being wetted in 60 minutes is ≤20 wt %.

14. The paperboard according to claim 1 , wherein the Wick index of the coated paperboard is ≤3 kg/m 2 .

15. A beverage container carrier comprising the coated paperboard according to claim 1 .

16. The beverage container carrier according to claim 15 , wherein the carrier comprises a handle formed by a structure in the coated paperboard, and/or a structure made of the coated paperboard, or both.

17. The beverage container carrier according to claim 15 , wherein the main component of this carrier is a blank of the coated paperboard.

18. The beverage container carrier according to claim 15 , wherein a shape of the carrier is that of open ended tubular carton with a top wall, two side walls and a bottom wall which is formed by wrapping the coated paperboard about the beverage containers.

Assignees

• Stora Enso Oyj

Inventors

• Ljungqvist Carl-Henrik

Classifications

• D21H21/20

  Wet strength agents · CPC title

• D21H21/16 Primary

  Sizing or water-repelling agents · CPC title

• D21H19/824

  two superposed coatings, both being non-pigmented · CPC title

• D21H19/46

  Non-macromolecular organic compounds · CPC title

• B65D2571/00716

  tubular without end walls · CPC title