# US 10,246,537 B2 · Resin composition containing ethylene-vinyl alcohol copolymer, molded product, and multilayer structure

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- Number: US 10,246,537 B2
- Document ID: US10246537B2
- Status: Granted
- Kind: B2
- Application number: 15/506,862
- Filed: 2015-08-19
- Published: 2017-09-28
- Granted: 2019-04-02
- Earliest claimed: 2014-08-28
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Wataru Hirose; Takeyuki Igarashi
- Web page: https://patentgrep.com/patent/US10246537B2

## CPC

- C08F 216/06: Polyvinyl alcohol {; Vinyl alcohol}
- 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 27/20: using fillers, pigments, thixotroping agents
- B32B 27/22: using plasticisers
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (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
- B32B 27/38: comprising epoxy resins
- B32B 27/40: comprising polyurethanes
- C08F 210/02: Ethene
- C08F 210/10: Isobutene
- C08F 297/08: polymerising mono-olefins
- C08J 5/18: Manufacture of films or sheets
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08L 53/00: Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/05: 5 or more layers
- B32B 2250/24: All layers being polymeric
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/50: having particular mechanical properties
- B32B 2307/51: Elastic
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/558: Impact strength, toughness
- B32B 2307/7242: Non-permeable
- B32B 2307/748: Releasability
- B32B 2437/02: Gloves, shoes
- B32B 2439/00: Containers; Receptacles
- B32B 2439/70: Food packaging
- B32B 2439/80: Medical packaging
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- B32B 2607/02: Wall papers, wall coverings
- C08L 2205/04: containing interpenetrating networks
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.

## Claims

### Claim 1

A resin composition, comprising:
an ethylene-vinyl alcohol copolymer (A); and
a block copolymer (B) comprising a block (b1) that includes a vinyl aromatic monomer unit and a block (b2) that includes an isobutylene unit,
wherein:
the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure;
a DSC curve obtained by cooling the resin composition at a rate of 50° C./min after heating the resin composition up to a melting point in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C.; and
a mass ratio of the ethylene-vinyl alcohol copolymer (A) to the block copolymer (B) is 52/48 or greater and 63/37 or less.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein, at a temperature of 230° C. and under a load of 2,160 g, a melt flow rate of the ethylene-vinyl alcohol copolymer (A) is less than a melt flow rate of the block copolymer (B).

### Claim 3 (depends on 1)

The resin composition according to claim 1, wherein a film having a thickness of 100 μm formed from the resin composition has a storage elastic modulus at 23° C. of 600 MPa or greater and 1,200 MPa or less, as determined by a method in accordance with JIS K 7244-4: 2010 for measuring a dynamic viscoelasticity.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 4)

The molded product according to claim 4, which is a packaging material for food and beverages, a packing material for containers, a material for medical infusion bags, a tube material for tires, or a cushion material for shoes.

### Claim 6 (depends on 1)

A multilayer structure, comprising
a layer formed from the resin composition according to claim 1.

### Claim 7 (depends on 6)

The multilayer structure according to claim 6, which is a packaging material for food and beverages, a packing material for containers, a material for medical infusion bags, a tube material for tires, or a cushion material for shoes.

### Claim 8 (depends on 1)

The resin composition according to claim 1, wherein a melt flow rate of the ethylene-vinyl alcohol copolymer (A) at a temperature of 230° C. and under a load of 2,160 g is from 5.0 to 20 g/10 min.

### Claim 9 (depends on 1)

The resin composition according to claim 1, wherein the block (b1) is constituted with styrene units.

### Claim 10 (depends on 1)

The resin composition according to claim 1, wherein a number average molecular weight of the block (b1) is from 5,000 to 200, 000.

### Claim 11 (depends on 1)

The resin composition according to claim 1, wherein a number average molecular weight of the block (b2) is from 10,000 to 400, 000.

### Claim 12 (depends on 1)

The resin composition according to claim 1, wherein a number average molecular weight of the block copolymer (B) is from 30,000 to 400, 000.

### Claim 13 (depends on 1)

The resin composition according to claim 1, wherein a melt flow rate of the block copolymer (B) at a temperature of 230° C. and under a load of 2,160 g is from 5.0 to 20 g/10 min.

### Claim 14 (depends on 1)

The resin composition according to claim 1, wherein the block copolymer (B) comprises at least one functional group selected from the group consisting of: a hydroxyl group; an amino group; an alkylamino group; an ether group; an ester group; an amide group; and a group having a structure of a dicarboxylic acid anhydride.

### Claim 15 (depends on 1)

The resin composition according to claim 1, wherein the mass ratio of the ethylene-vinyl alcohol copolymer (A) to the block copolymer (B) is 57/43 or greater and 61/39 or less.

### Claim 16 (depends on 1)

The resin composition according to claim 1, wherein a value obtained by subtracting a melt flow rate of the block copolymer (B) at a temperature of 230° C. and under a load of 2,160 g from a melt flow rate of the ethylene-vinyl alcohol copolymer (A) at a temperature of 230° C. and under a load of 2,160 g, is from 3 to 10 g/10 min.