# US 11,298,926 B2 · Multilayered containers

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,298,926 B2
- Document ID: US11298926B2
- Status: Granted
- Kind: B2
- Application number: 16/493,196
- Filed: 2018-03-14
- Published: 2020-01-16
- Granted: 2022-04-12
- Earliest claimed: 2017-03-15
- Assignees: Toyo Seikan Group Holdings, Ltd.
- Applicants: Toyo Seikan Group Holdings, Ltd.
- Inventors: Yuuki Tashiro; Takayuki Ishihara; Azusa Otsuki
- Web page: https://patentgrep.com/patent/US11298926B2

## CPC

- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 1/00: Layered products having a non-planar shape
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- 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)}
- C08L 23/12: Polypropene
- B32B 2250/05: 5 or more layers
- 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 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/306: Resistant to heat
- B32B 2307/406: Bright, glossy, shiny surface
- B32B 2307/412: Transparent
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/558: Impact strength, toughness
- B32B 2307/72: Density
- B32B 2307/7244: Oxygen barrier
- B32B 2307/74: Oxygen absorber
- B32B 2439/00: Containers; Receptacles
- B32B 2439/70: Food packaging
- B32B 2439/80: Medical packaging
- C08L 2201/14: Gas barrier composition
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2207/10: Peculiar tacticity
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A gas-barrier multilayered container having (i) a layer of a propylene type polymer which chiefly includes a homopolypropylene having an isotactic index of not less than 93%, and (ii) a layer of an ethylene-vinyl alcohol copolymer having not less than two crystal melting peak temperatures. Also disclosed is a lustrous and shock-resistant multilayered container having at least (i) an outermost layer of a propylene type polymer A which chiefly includes a homopolypropylene having a melt flow rate of 2.0 to 10.0 g/10 min., and (ii) an inner layer of a propylene type polymer B which chiefly includes a homopolypropylene having a melt flow rate of not more than 1.0 g/10 min.

## Claims

### Claim 1

A multilayered container having at least a layer of a propylene type polymer which includes a homopolypropylene having an isotactic index of not less than 93%, in an amount of not less than 80% by weight, and a layer of an ethylene-vinyl alcohol copolymer having not less than two crystal melting peak temperatures, wherein
the multilayered container has a layer constitution which includes a layer of the propylene type polymer/a reground resin layer/an adhesive resin layer/a first intermediate layer of an ethylene-vinyl alcohol copolymer/an oxygen-absorbing layer/a second intermediate layer of an ethylene-vinyl alcohol copolymer/an adhesive resin layer/an adsorbent-containing layer/an inner layer of the propylene type polymer in this order from the outer side, wherein at least one of the first and second intermediate layers of an ethylene-vinyl alcohol copolymer is the ethylene-vinyl alcohol copolymer having not less than two crystal melting peak temperatures.

### Claim 2 (depends on 1)

The multilayered container according to claim 1, wherein the first and second intermediate layers of the ethylene-vinyl alcohol copolymer include a blend of two or more kinds of ethylene-vinyl alcohol copolymers having different ethylene contents, and have crystal melting peak temperatures which are at least not lower than 180° C. and not higher than 170° C.

### Claim 3 (depends on 1)

The multilayered container according to claim 1, wherein the first and second intermediate layers of the ethylene-vinyl alcohol copolymer include a blend of an ethylene-vinyl alcohol copolymer having an ethylene content of 20 to 35 mol % and an ethylene-vinyl alcohol copolymer having an ethylene content of 36 to 50 mol %, at a blending ratio of 90:10 to 50:50.

### Claim 4 (depends on 1)

The multilayered container according to claim 1, wherein the propylene type polymer contains a nucleating agent.

### Claim 5 (depends on 1)

The multilayered container according to claim 1, wherein the propylene type polymer comprises a homopolypropylene having a melt flow rate of not more than 2.0 g/10 min., in an amount of not less than 80% by weight.

### Claim 6

A multilayered container having at least an outermost layer of a propylene type polymer A which includes a homopolypropylene having a melt flow rate of 2.0 to 10.0 g/10 min., in an amount of not less than 80% by weight; an inner layer of a propylene type polymer B which includes a homopolypropylene having a melt flow rate of not more than 1.0 g/10 min., in an amount of not less than 80% by weight; an intermediate layer of an ethylene-vinyl alcohol copolymer formed between the outermost layer and the inner layer, and a layer containing the propylene type polymer B formed between the intermediate layer of the ethylene-vinyl alcohol copolymer and the outermost layer, wherein
an isotactic index of not less than 95% is possessed by the homopolypropylene which is the chief component of the propylene type polymer A and the propylene type polymer B.

### Claim 7 (depends on 6)

The multilayered container according to claim 6, wherein the ratio of thickness of the outermost layer is not more than 20% relative to the total thickness of the container.

### Claim 8 (depends on 6)

The multilayered container according to claim 6, wherein the propylene type polymer A and the propylene type polymer B contain a nucleating agent.

### Claim 9 (depends on 6)

The multilayered container according to claim 6, wherein the intermediate layer of the ethylene-vinyl alcohol copolymer includes a blend of two or more kinds of ethylene-vinyl alcohol copolymers having different ethylene contents.

### Claim 10 (depends on 6)

The multilayered container according to claim 6, wherein the multilayered container has a layer constitution which includes the outermost layer/a reground resin layer/an adhesive resin layer/an intermediate layer of an ethylene-vinyl alcohol copolymer/an oxygen-absorbing layer/an intermediate layer of an ethylene-vinyl alcohol copolymer/an adhesive resin layer/an adsorbent-containing layer/the inner layer in this order from the outer side.