# US 12,600,848 B2 · Resin composition, molded product, laminate, thermoformed container, blow-molded container, film, agricultural film, plant medium, and pipe

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- Number: US 12,600,848 B2
- Document ID: US12600848B2
- Status: Granted
- Kind: B2
- Application number: 17/800,652
- Filed: 2020-06-18
- Published: 2023-03-23
- Granted: 2026-04-14
- Earliest claimed: 2020-02-21
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Mizuko Oshita; Yasuhiro Nonaka
- Web page: https://patentgrep.com/patent/US12600848B2

## CPC

- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- 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 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- C08F 8/12: Hydrolysis
- C08K 3/08: Metals
- C08K 5/098: Metal salts of carboxylic acids
- B32B 2250/24: All layers being polymeric
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2264/10: Inorganic particles
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/518: bi-axially
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/7244: Oxygen barrier
- B32B 2307/738: Thermoformability
- B32B 2307/748: Releasability
- B32B 2439/46: Bags
- C08K 3/105: Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table
- C08K 2003/0812: {Aluminium}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided are: a resin composition which inhibits the generation of aggregates at the time of melt molding and enables obtaining a molded product which has sufficient heat/light resistance and is unlikely to break down into microplastics after being discarded, the above-mentioned characteristics being sufficiently improved compared to a resin composition obtained using the same ethylene-vinyl alcohol copolymer (EVOH), and the like. The resin composition contains: an ethylene-vinyl alcohol copolymer (A); and an aluminum ion (B), wherein at least a part of the ethylene-vinyl alcohol copolymer (A) comprises, at a polymer end, at least one of a carboxylic acid unit (I) and a lactone ring unit (II), a total content (i+ii) of the carboxylic acid unit (I) and the lactone ring unit (II) per gram of the ethylene-vinyl alcohol copolymer (A) is 14 μmol/g or more and 78 μmol/g or less, and a content (b) of the aluminum ion (B) per gram of the ethylene-vinyl alcohol copolymer (A) is 0.002 μmol/g or more and 0.17 μmol/g or less.

## Claims

### Claim 1

A resin composition comprising: an ethylene-vinyl alcohol copolymer (A); and an aluminum ion (B), wherein
at least a part of the ethylene-vinyl alcohol copolymer (A) comprises, at a polymer end, at least one of a carboxylic acid unit (I) and a lactone ring unit (II),
a total content (i+ii) of the carboxylic acid unit (I) and the lactone ring unit (II) per gram of the ethylene-vinyl alcohol copolymer (A) is 14 μmol/g or more and 78 μmol/g or less,
a content (b) of the aluminum ion (B) per gram of the ethylene-vinyl alcohol copolymer (A) is 0.002 μmol/g or more and 0.17 μmol/g or less, and
the aluminum ion (B) is derived from a fatty acid aluminum salt having 5 or fewer carbon atoms.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein a ratio ((i+ii)/b) of the total content (i+ii) of the carboxylic acid unit (I) and the lactone ring unit (II) to the content (b) of the aluminum ion (B) is 180 or more and 20,000 or less.

### Claim 3 (depends on 1)

The resin composition according to claim 1, further comprising at least one type of a compound (C) selected from the group consisting of a cinnamic acid component and a conjugated polyene compound having a molecular weight of 1,000 or less, wherein
a content (c) of the compound (C) with respect to the ethylene-vinyl alcohol copolymer (A) is 1 ppm or more and 1,000 ppm or less.

### Claim 4 (depends on 1)

The resin composition according to claim 1, wherein a proportion (ii/(i+ii)) of a content (ii) of the lactone ring unit (II) with respect to the total content (i+ii) of the carboxylic acid unit (I) and the lactone ring unit (II) is 40 mol % or more.

### Claim 5 (depends on 1)

The resin composition according to claim 1, wherein
the ethylene-vinyl alcohol copolymer (A) comprises:
an ethylene-vinyl alcohol copolymer (A1) having an ethylene unit content of 20 mol % or more and 50 mol % or less; and
an ethylene-vinyl alcohol copolymer (A2) having an ethylene unit content of 30 mol % or more and 60 mol % or less,
a value obtained by subtracting the ethylene unit content of the ethylene-vinyl alcohol copolymer (A1) from the ethylene unit content of the ethylene-vinyl alcohol copolymer (A2) is 5 mol % or more, and
a mass ratio (A1/A2) of the ethylene-vinyl alcohol copolymer (A1) to the ethylene-vinyl alcohol copolymer (A2) is 60/40 or more and 95/5 or less.

### Claim 6 (depends on 1)

The resin composition according to claim 1, further comprising: a polyamide (D); and at least one type of a metal atom (E) selected from the group consisting of atoms of magnesium, calcium, and zinc, wherein
a mass ratio (D/A) of the polyamide (D) to the ethylene-vinyl alcohol copolymer (A) is 5/95 or more and 40/60 or less, and
a content (e), in terms of metal element equivalent, of the metal atom (E) with respect to the ethylene-vinyl alcohol copolymer (A) is 1 ppm or more and 500 ppm or less.

### Claim 7 (depends on 1)

The resin composition according to claim 1, further comprising a thermoplastic elastomer (F), wherein
a mass ratio (F/A) of the thermoplastic elastomer (F) to the ethylene-vinyl alcohol copolymer (A) is 5/95 or more and 35/65 or less.

### Claim 8 (depends on 7)

The resin composition according to claim 7, wherein the thermoplastic elastomer (F) is at least one selected from the group consisting of a thermoplastic polyester elastomer, a thermoplastic polystyrene elastomer, and a thermoplastic polyolefin elastomer.

### Claim 9 (depends on 1)

The resin composition according to claim 1, further comprising an antioxidant (G), wherein
a content (g) of the antioxidant (G) with respect to the ethylene-vinyl alcohol copolymer (A) is 0.01% by mass or more and 5% by mass or less.

### Claim 10 (depends on 1)

The resin composition according to claim 1, further comprising an inorganic particle (H), wherein
a content (h) of the inorganic particle (H) with respect to the ethylene-vinyl alcohol copolymer (A) is 50 ppm or more and 5,000 ppm or less.

### Claim 11 (depends on 1)

A molded product formed from the resin composition according to claim 1.

### Claim 12 (depends on 1)

A laminate comprising: a layer constituted from the resin composition according to claim 1; and at least one other layer.

### Claim 13 (depends on 1)

A thermoformed container comprising a layer constituted from the resin composition according to claim 1.

### Claim 14 (depends on 1)

A blow-molded container comprising a layer constituted from the resin composition according to claim 1.

### Claim 15 (depends on 1)

A film comprising a layer constituted from the resin composition according to claim 1.

### Claim 16 (depends on 15)

The film according to claim 15, further comprising an inorganic vapor deposition layer.

### Claim 17 (depends on 1)

An agricultural film comprising a layer constituted from the resin composition according to claim 1.

### Claim 18 (depends on 1)

A plant medium constituted from the resin composition according to claim 1.

### Claim 19 (depends on 1)

A pipe comprising a layer constituted from the resin composition according to claim 1.