# US 12,214,573 B2 · Gas barrier laminate and packaging material using the same

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- Number: US 12,214,573 B2
- Document ID: US12214573B2
- Status: Granted
- Kind: B2
- Application number: 17/585,817
- Filed: 2022-01-27
- Published: 2022-05-12
- Granted: 2025-02-04
- Earliest claimed: 2019-07-29
- Assignees: Toppan Inc.
- Applicants: Toppan Inc.
- Inventors: Ayumi Tanaka
- Web page: https://patentgrep.com/patent/US12214573B2

## CPC

- B32B 27/08: of synthetic resin
- C23C 14/08: Oxides (C23C14/10 takes precedence)
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/18: characterised by the use of special additives
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- 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 65/42: Applications of coated or impregnated materials
- C08J 7/0423: {with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder}
- C08J 7/048: Forming gas barrier coatings
- C23C 14/081: {of aluminium, magnesium or beryllium}
- C23C 14/10: Glass or silica
- C23C 14/24: Vacuum evaporation
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/246: All polymers belonging to those covered by groups B32B27/32 and B32B27/30
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/20: Inorganic coating
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2264/00: Composition or properties of particles which form a particulate layer or are present as additives
- B32B 2264/10: Inorganic particles
- B32B 2264/102: Oxide or hydroxide
- B32B 2307/30: having particular thermal properties
- B32B 2307/308: Heat stability
- B32B 2307/31: Heat sealable
- B32B 2307/514: Oriented
- B32B 2307/516: mono-axially
- B32B 2307/538: Roughness
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/7242: Non-permeable
- B32B 2307/7244: Oxygen barrier
- B32B 2307/732: Dimensional properties
- B32B 2439/70: Food packaging
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- C08J 2323/12: Polypropene
- C08J 2323/14: Copolymers of propene (C08J2323/16 takes precedence)
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2429/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- Y02W 30/80: Packaging reuse or recycling, e.g. of multilayer packaging (bio-packaging Y02W90/10)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- 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
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A gas barrier laminate includes a polypropylene substrate layer; a first polyvinyl alcohol resin layer; and a metal oxide layer, which are laminated in this order, wherein the first polyvinyl alcohol resin layer has a mass per unit area of 0.5 to 2.5 g/m; and, a packaging material includes the above gas barrier laminate and a polypropylene sealant layer disposed on a surface of the gas barrier laminate, wherein a mass ratio of a sum of the polypropylene substrate layer and the polypropylene sealant layer to a total mass of the packaging material is 85 mass % or more.

## Claims

### Claim 1

A packaging material consisting of:
a polypropylene substrate layer;
a first layer consisting essentially of ethylene-vinyl alcohol copolymer, the first layer is directly on the polypropylene substrate layer, the first layer having a mass per unit area of 0.5 to 2.5 g/m2, the first layer is formed on the polypropylene substrate layer by extrusion;
a metal oxide layer consisting of silicon oxide or aluminum oxide, the metal oxide layer is directly on the first layer;
a second layer directly on the metal oxide layer, the second layer consists essentially of polyvinyl alcohol and a silane compound;
an adhesive and
a polypropylene sealant layer bonded to the second layer via the adhesive, wherein a surface of the first layer in contact with the metal oxide layer has a surface roughness Sa of 0.2 μm or less.

### Claim 2 (depends on 1)

The packaging material of claim 1, wherein the surface of the first polyvinyl alcohol resin layer in direct contact with the metal oxide layer has the surface roughness Sa of 0.1 μm or less.

### Claim 3 (depends on 1)

The packaging material of claim 1, wherein the polypropylene substrate layer is a propylene monopolymer layer.

### Claim 4 (depends on 1)

The packaging material of claim 1, wherein a mass ratio of the silane compound relative to a mass of the second layer is 0.05to 0.95.

### Claim 5 (depends on 1)

The packaging material of claim 1, wherein the second layer has a thickness of 0.1 to 1.0 μm.

### Claim 6 (depends on 1)

The packaging material claim 1, wherein the first layer has a thickness of 0.4 to 2.0 μm.

### Claim 7 (depends on 1)

The packaging material of claim 1, wherein the metal oxide layer is a vapor deposition layer having a thickness of 5 to 100 nm.

### Claim 8 (depends on 1)

The packaging material of claim 1, wherein
a mass ratio of a sum of the polypropylene substrate layer and the polypropylene sealant layer to a total mass of the packaging material is 85 mass % or more.