# US 2024/0200271 A1 · Use of a high-density paper substrate, the coated high-density substrate and a laminated packaging material and packaging container comprising it

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- Number: US 2024/0200271 A1
- Document ID: US20240200271A1
- Status: Published application
- Kind: A1
- Application number: 18/555,125
- Filed: 2022-04-13
- Published: 2024-06-20
- Earliest claimed: 2021-04-13
- Assignees: Tetra Laval Holdings & Finance S.A.
- Applicants: Tetra Laval Holdings & Finance S.A.
- Inventors: Ulf Nyman; Mats Aldén; Olivia Markbo; Fredrik Nordström
- Web page: https://patentgrep.com/patent/US20240200271A1

## CPC

- D21H 19/20: comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38)
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/10: of paper or cardboard
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 29/005: {next to another layer of paper or cardboard layer}
- D21H 17/26: Ethers thereof
- D21H 17/28: Starch
- D21H 17/36: Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
- D21H 19/34: comprising cellulose or derivatives thereof
- D21H 27/36: Films made from synthetic macromolecular compounds
- D21H 27/38: at least one of the sheets having a fibrous composition differing from that of other sheets
- B32B 2255/12: on paper layer
- B32B 2255/20: Inorganic coating
- B32B 2255/26: Polymeric coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2260/028: Paper layer
- B32B 2260/046: Synthetic resin
- B32B 2264/102: Oxide or hydroxide
- B32B 2307/31: Heat sealable
- B32B 2307/538: Roughness
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/72: Density
- B32B 2307/7265: Non-permeable
- B32B 2307/7376: Thickness
- B32B 2439/70: Food packaging
- 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

## Abstract

The disclosure relates to the use of a high-density paper substrate made from cellulose fibres, as a gas-barrier material in a laminated packaging material for packaging of oxygen sensitive products, and further to coated such high-density paper substrates for increased gas barrier properties. Also disclosed are laminated packaging materials comprising the high-density paper substrates or coated high-density paper substrates, and packaging containers comprising the laminated packaging material, for packaging of oxygen-sensitive products.

## Claims

### Claim 1

Use of a high-density paper substrate made from cellulose fibres, as a gas-barrier material in a laminated packaging material for packaging of liquid, semi-liquid or viscous food products or water, wherein the high-density paper substrate has a grammage from 30 to 75 g/m2, as measured according to ISO 536:2012, a density above 1000 kg/m3, as measured according to ISO 534:2011, and is impregnated, at a top-side surface of the paper, with an impregnating composition comprising an impregnating polymer selected from the group consisting of polyvinyl alcohol, PVOH, ethylene vinyl alcohol, EVOH, starch, starch derivatives, carboxymethyl cellulose, nanocrystalline cellulose, NCC, and blends of two or more thereof, wherein the amount of impregnated polymer is from 0.3 to 4.0 g/m2.

### Claim 2 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate is formed from cellulose fibres comprising at least 50% by dry weight of chemical pulp.

### Claim 3 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate is formed from cellulose fibres comprising 35-100% of softwood pulp, by dry weight of the pulp used to form the high-density paper, 0-65% hardwood pulp and optionally 0-15% of CTMP pulp, by dry weight of the pulp used to form the high-density paper.

### Claim 4 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate provides a Schopper-Riegler (° SR) number measured according to ISO 5267-1:1999 of from 30 to 50 after repulping according to ISO 5263-1:2004.

### Claim 5 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate has a mean fines content measured with a L & W Fibretester+(ABB, Lorentzen & Wettre, Sweden) of less than 40% as measured according to ISO 16065-2:2014 after repulping according to ISO 5263-1:2004, wherein fines are defined as fibrous particles shorter than 0.2 mm.

### Claim 6 (depends on 1)

Use according to claim 1, wherein the cellulose fibres of the high-density paper substrate exhibit a Canadian Standard Freeness, CSF, value above 200 ml as measured according to ISO 5267-2:2001, after repulping according to the Valmet repulping method carried out in a Valmet pulper of the type HD400.

### Claim 7 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate is impregnated from the top-side and subsequently calendered to a roughness of the top-side surface lower than 100 ml/min Bendtsen measured according to SS-ISO 8791-2:2013.

### Claim 8 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate further, at an opposite, back-side surface of the paper, is impregnated with an impregnating composition comprising an impregnating polymer selected from the same group as for the top-side surface of the paper, wherein the paper is impregnated from the back-side and subsequently calendered to a roughness of the back-side surface lower than 200 ml/min Bendtsen as measured according to SS-ISO 8791-2:2013.

### Claim 9 (depends on 1)

Use according to claim 1, wherein the impregnating composition further comprises inorganic particles selected from the group consisting of clays, and talcum, CaCO3, or silica particles, in addition to the polymer.

### Claim 10 (depends on 1)

Use according to claim 1, wherein the thickness of the high-density paper substrate is from 35 to 75 μm.

### Claim 11 (depends on 1)

Use according to claim 1, wherein the high-density paper substrate has a top ply and a bottom ply.

### Claim 12 (depends on 10)

Use according claim 10, wherein the top ply is formed from at least 50% by dry weight hardwood pulp.

### Claim 13 (depends on 10)

Use according to claim 10, wherein the bottom ply is formed from at least 50% by dry weight softwood pulp.

### Claim 14 (depends on 1)

Coated high-density paper substrate, for use as a gas-barrier material in a laminated packaging material for liquid, semi-liquid or viscous food products or water, the paper substrate being defined as in claim 1, wherein the top-side surface of the paper substrate has at least one coating of at least one gas barrier material to a total coating thickness from 2 to 5000 nm.

### Claim 15 (depends on 14)

Coated high-density paper substrate according to claim 14, wherein the top-side surface of the paper substrate is coated to a dry coating thickness from 100 to 5000 nm (from 1 to 5 μm), with a gas barrier material comprising a polymer selected from the group consisting of vinyl alcohol polymers and copolymers.

### Claim 16 (depends on 14)

Coated high-density paper substrate according to claim 14, wherein the top-side surface of the paper substrate has a vapour deposition coating of a gas barrier material selected from metals, metal oxides, inorganic oxides and amorphous diamond-like carbon coatings.

### Claim 17 (depends on 14)

Coated high-density paper substrate according to claim 14, wherein the top-side surface of the paper substrate has a first coating of a gas barrier material formed by coating and subsequent drying of a dispersion or solution of an aqueous gas barrier composition, and further has a vapour deposition coating of a gas barrier material selected from metals, metal oxides, inorganic oxides and amorphous diamond-like carbon, applied on the first coating.

### Claim 18 (depends on 14)

Laminated packaging material for packaging of liquid, semi-liquid or viscous food products or water, comprising a high-density paper substrate made from cellulose fibres, as a gas-barrier material, wherein the high-density paper substrate has a grammage from 30 to 75 q/m2, as measured according to ISO 536:2012, a density above 1000 kg/m3, as measured according to ISO 534:2011, and is impregnated, at a top-side surface of the paper, with an impregnating composition comprising an impregnating polymer selected from the group consisting of polyvinyl alcohol, PVOH, ethylene vinyl alcohol, EVOH, starch, starch derivatives, carboxymethyl cellulose, nanocrystalline cellulose, NCC, and blends of two or more thereof, wherein the amount of impregnated polymer is from 0.3 to 4.0 q/m2 dry weight or the coated high-density paper substrate according to claim 14, and further comprising a first outermost layer of a liquid tight material and a second innermost layer of a liquid tight material.

### Claim 19 (depends on 18)

Laminated packaging material for packaging of liquid, semi-liquid or viscous food products or water, according to claim 18, further comprising a bulk layer of paper or paperboard or other cellulose-based material and having the high-density paper substrate, or gas-barrier coated paper substrate, laminated between the bulk layer and the second innermost layer.

### Claim 20 (depends on 18)

Laminated packaging material according to claim 18, wherein the high-density paper substrate, or gas-barrier coated paper substrate, is laminated to the bulk layer by from 0.5 to 5 g/m2 of an interjacent bonding composition comprising a binder selected from the group consisting of acrylic polymers and copolymers, starch, starch derivatives, cellulose derivatives, polymers and, copolymers of vinyl acetate, copolymers of vinyl alcohol, and copolymers of styrene-acrylic latex or styrene-butadiene latex.

### Claim 21 (depends on 18)

Laminated packaging material according to claim 18, having a pre-manufactured polymer film laminated between the high-density paper substrate or gas-barrier coated paper substrate, and the second innermost liquid tight material layer, for improved robustness of the mechanical properties of the laminated packaging material.

### Claim 22 (depends on 18)

Laminated packaging material according to claim 18, having a pre-manufactured polymer film laminated on the inner side of the high-density paper substrate or gas-barrier coated paper substrate, i.e. on the side of the paper substrate which is opposite to the side that is laminated to the bulk layer, wherein the pre-manufactured polymer film has a vapour deposition coating of a gas barrier material selected from metals, metal oxides, inorganic oxides and amorphous diamond-like carbon coatings.

### Claim 23 (depends on 18)

Laminated packaging material for packaging of liquid, semi-liquid and viscous food or water, according to claim 18, further comprising a bulk layer of paper or paperboard or other cellulose-based material and having the high-density paper substrate, or gas-barrier coated high-density paper substrate, laminated between the bulk layer and the first outermost layer.

### Claim 24 (depends on 23)

Laminated packaging material according to claim 23, wherein the top-side surface of the high-density paper substrate is coated with an aluminium metallization coating and is directed towards the first outermost layer in the laminated packaging material.

### Claim 25 (depends on 18)

Laminated packaging material for packaging of liquid, semi-liquid and viscous food or water, according to claim 18, comprising a further high-density paper substrate, or gas-barrier coated high-density paper substrate, laminated between the bulk layer and the first outermost layer.

### Claim 26 (depends on 18)

Packaging container for packaging of liquid, semi-liquid or viscous food products or water, comprising the laminated packaging material as defined in claim 18.