# US 2026/0274535 A1 · Barrier-coated cellulose-based substrate, laminated packaging material and packaging container comprising the cellulose-based substrate

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- Number: US 2026/0274535 A1
- Document ID: US20260274535A1
- Status: Published application
- Kind: A1
- Application number: 19/669,328
- Filed: 2026-05-06
- Published: 2026-09-17
- Earliest claimed: 2020-12-22
- Assignees: Tetra Laval Holdings & Finance S.A.
- Applicants: Tetra Laval Holdings & Finance S.A.
- Inventors: Mikael BERLIN; Jan WAHLBERG; Gloria GUIDETTI
- Web page: https://patentgrep.com/patent/US20260274535A1

## CPC

- B32B 29/005: {next to another layer of paper or cardboard layer}
- B65D 65/42: Applications of coated or impregnated materials
- 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 27/16: specially treated, e.g. irradiated
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- 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 37/24: with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate (B32B37/15 takes precedence)
- B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)}
- B65D 81/24: Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants (with thermal insulation B65D81/38)
- B65D 85/72: for edible or potable liquids, semiliquids, or plastic or pasty materials
- C01B 32/182: Graphene
- C01B 32/194: After-treatment
- C01B 32/198: Graphene oxide
- D21H 15/08: Flakes (D21H13/44 takes precedence)
- D21H 17/63: Inorganic compounds
- D21H 17/675: {Oxides, hydroxides or carbonates}
- D21H 19/385: {Oxides, hydroxides or carbonates}
- D21H 19/826: {two superposed coatings, the first applied being pigmented and the second applied being non-pigmented}
- D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38)
- B05D 1/28: performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- B05D 3/0263: {with IR heaters}
- B05D 7/04: to surfaces of films or sheets (producing layered products by applying coatings of pasty or pulverulent plastics B29C41/00)
- B05D 2252/02: of indefinite length
- B32B 2037/243: {Coating}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- 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 2264/108: Carbon, e.g. graphite particles
- B32B 2307/31: Heat sealable
- B32B 2307/7244: Oxygen barrier
- B32B 2310/0806: using electromagnetic radiation
- B32B 2315/02: Ceramics
- B32B 2439/46: Bags
- B32B 2439/60: Bottles
- B32B 2439/62: Boxes, cartons, cases
- B32B 2439/70: Food packaging
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)

## Abstract

The present invention relates to a method for manufacturing a barrier-coated substrate web, coated with a layer of reduced graphene oxide. The invention further relates to laminated packaging materials comprising the barrier-coated substrate web, in particular intended for liquid carton food packaging, and to liquid carton packaging containers comprising the laminated packaging material.

## Claims

### Claim 1

Method for producing an oxygen barrier material for a packaging material, by coating a substrate material web with a layer of reduced graphene oxide, comprising the steps of
a) providing and forwarding a substrate material web,
b) providing an aqueous composition comprising graphene oxide including monolayer flakes of graphene oxide and multilayer graphene oxide platelets, having up to 20 stacked monolayer flakes of graphene oxide,
c) coating the aqueous composition of graphene oxide onto the surface of the substrate material web while it is being forwarded,
d) drying the wet coating of aqueous graphene oxide on the substrate material web, by forced evaporation, to obtain a first dry layer of layered graphene oxide particles or flakes,
e) applying an aqueous solution of a reducing agent onto the first dry layer of graphene oxide on the substrate material web,
f) directly following step e) drying the wet aqueous coating of the reducing agent, by forced evaporation, to obtain a second dry layer of reducing agent, and
g) allowing the reducing agent of the second dry layer to reduce the graphene oxide of the underlying, first dry layer, during a minimum predetermined time at a minimum pre-determined temperature, to form a barrier-coated substrate material web with the dry layer of reduced graphene oxide.

### Claim 2 (depends on 1)

Method according to claim 1, comprising a further step i) of coating or laminating the barrier-coated substrate material web to a further layer of a polymer, to cover the second dry layer of the reducing agent, to be performed before or after step g).

### Claim 3 (depends on 1)

Method according to claim 1, comprising a further step h), of winding the coated and dried, barrier-coated substrate material web onto a reel, to be performed before or after step g).

### Claim 4 (depends on 1)

Method according to claim 1, wherein the concentration of the aqueous composition of graphene oxide is from 0.1 to 15 weight-%.

### Claim 5 (depends on 1)

Method according to claim 1, wherein the wet coated thickness of the aqueous composition of graphene oxide is from 10 to 400 μm.

### Claim 6 (depends on 1)

Method according to claim 1, wherein the reducing agent is selected from the group consisting of sodium citrate, ascorbic acid (vitamin C), lemon juice, vinegar and green tea.

### Claim 7 (depends on 1)

Method according to claim 1, wherein the reducing agent is ascorbic acid.

### Claim 8 (depends on 1)

Method according to claim 1, wherein the concentration of the reducing agent is from 0.5 to 15 weight-%.

### Claim 9 (depends on 1)

Method according to claim 1, wherein the dried, barrier-coated substrate material web from step f), before or during step g) is irradiated to accelerate the reduction reaction taking place between the applied first and second dry layers.

### Claim 10 (depends on 1)

Method according to claim 1, wherein the substrate material web is continuously forwarded at a constant speed.

### Claim 11 (depends on 1)

Barrier-coated substrate material web as obtained by the method of any claim 1, for use as an oxygen barrier material in a laminated packaging material for liquid food products, comprising a substrate material substrate web and applied onto it a dry layer from layered particles or flakes of reduced graphene oxide.

### Claim 12 (depends on 11)

Barrier-coated substrate material web, according to claim 11, wherein the thickness of the dry layer from layered particles or flakes of reduced graphene oxide is from 50 to 1000 nm.

### Claim 13 (depends on 11)

Barrier-coated substrate material web, according to claim 11, wherein the substrate material web is a polymer film web, a paper or other cellulose-based material web or a polymer-coated paper or other cellulose-based material web.

### Claim 14 (depends on 11)

Barrier-coated substrate material web, according to claim 11, wherein the dry layer from layered particles or flakes of reduced graphene oxide is further coated with or laminated to an adjacent polymer layer.

### Claim 15 (depends on 11)

Laminated packaging material comprising the barrier-coated substrate web as claimed in claim 11, and further comprising a first outermost protective material layer and a second innermost liquid tight, heat sealable material layer.

### Claim 16 (depends on 15)

Laminated packaging material according to claim 15, further comprising a bulk layer of paper or paperboard or other cellulose-based material, a first outermost protective material layer, a second innermost liquid tight, heat sealable material layer and, arranged on the inner side of the bulk layer of paper or paperboard, between the bulk layer and the innermost layer, said barrier-coated substrate web.

### Claim 17 (depends on 16)

Laminated packaging material according to claim 16, wherein the barrier-coated substrate web is bonded to the bulk layer by an intermediate bonding layer comprising a composition comprising a binder selected from the group consisting of acrylic polymers and copolymers, starch, cellulose and polysaccharide derivatives, polymers and copolymers of vinyl acetate and/or vinyl alcohol.

### Claim 18 (depends on 15)

Packaging container comprising the laminated packaging material as defined in claim 15.

### Claim 19 (depends on 1)

Method according to claim 1, wherein the multilayer graphene oxide platelets have 2-10 stacked monolayer flakes of graphene oxide.