# US 2019/0375928 A1 · Thermoplastic resin composition, inner liner, and pneumatic tire

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- Number: US 2019/0375928 A1
- Document ID: US20190375928A1
- Status: Published application
- Kind: A1
- Application number: 16/480,349
- Filed: 2018-01-19
- Published: 2019-12-12
- Earliest claimed: 2017-02-01
- Assignees: The Yokohama Rubber Co., Ltd.
- Applicants: The Yokohama Rubber Co., Ltd.
- Inventors: Shun SATO
- Web page: https://patentgrep.com/patent/US20190375928A1

## CPC

- C08L 23/283: Iso-olefin halogenated homopolymers or copolymers
- B60C 1/0008: {Compositions of the inner liner}
- C08L 23/28: by reaction with halogens or halogen-containing compounds (C08L23/32 takes precedence)
- C08L 29/06: Copolymers of allyl alcohol
- C08L 53/025: {modified}
- C08L 23/26: modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876)
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2205/22: Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer
- C08L 2207/02: Heterophasic composition
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

Provided is a thermoplastic resin composition from which an inner liner for pneumatic tires that decreases little in gas-barrier property upon fatigue can be produced. The thermoplastic resin composition comprises a matrix phase, which comprises an ethylene/vinyl alcohol copolymer (A), and a dispersed phase, which comprises a brominated isobutylene/p-methylstyrene copolymer (B) and an acid-modified styrene/ethylene/butylene/styrene copolymer (C), and is characterized by satisfying 0.02≤(WB×BB)×(WC×SC)/(WA×VA)≤0.85 where WA, WB, and WC are the weight proportions of the components (A), (B), and (C), respectively, to the total weight of the polymer components contained in the thermoplastic resin composition, VA (wt %) is the vinyl alcohol content in the component (A), BB (wt %) is the p-bromomethylstyrene content in the component (B), and SC (wt %) is the styrene content in the component (C).

## Claims

### Claim 1

A thermoplastic resin composition comprising
a matrix phase that comprises an ethylene-vinyl alcohol copolymer (A), and
a dispersed phase that comprises a brominated isobutylene-p-methylstyrene copolymer (B) and an acid-modified styrene-ethylene-butylene-styrene copolymer (C),
wherein the thermoplastic resin composition satisfies the following formula:
0.02≤(WB×BB)×(WC×SC)/(WA×VA)≤0.85
wherein
WA represents a weight ratio of the ethylene-vinyl alcohol copolymer (A) to a total weight of polymer components in the thermoplastic resin composition,
WB represents a weight ratio of the brominated isobutylene-p-methylstyrene copolymer (B) to a total weight of polymer components in the thermoplastic resin composition,
WC represents a weight ratio of the acid-modified styrene-ethylene-butylene-styrene copolymer (C) to a total weight of polymer components in the thermoplastic resin composition,
VA represents a vinyl alcohol content (% by weight) in the ethylene-vinyl alcohol copolymer (A),
BB represents a p-bromomethylstyrene content (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B), and
SC represents a styrene content (% by weight) in the acid-modified styrene-ethylene-butylene-styrene copolymer (C).

### Claim 2 (depends on 1)

The thermoplastic resin composition according to claim 1, wherein the acid-modified styrene-ethylene-butylene-styrene copolymer (C) has an acid value of 0.5 to 30 mg-CH3ONa/g.

### Claim 3 (depends on 1)

The thermoplastic resin composition according to claim 1, wherein a weight ratio (B)/(C) of the brominated isobutylene-p-methylstyrene copolymer (B) and the acid-modified styrene-ethylene-butylene-styrene copolymer (C) is 60/40 to 10/90.

### Claim 4 (depends on 1)

The thermoplastic resin composition according to claim 1, comprising 20 to 300 parts by weight of the ethylene-vinyl alcohol copolymer (A) based on 100 parts by weight of elastomer components in the dispersed phase.

### Claim 5 (depends on 1)

The thermoplastic resin composition according to claim 1, wherein the vinyl alcohol content VA (% by weight) in the ethylene-vinyl alcohol copolymer (A) is 50 to 90.

### Claim 6 (depends on 1)

The thermoplastic resin composition according to claim 1, wherein the p-bromomethylstyrene content BB (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B) is 1.0 to 5.0.

### Claim 7 (depends on 1)

The thermoplastic resin composition according to claim 1, wherein the styrene content SC (% by weight) in the acid-modified styrene-ethylene-butylene-styrene copolymer (C) is 5 to 40.

### Claim 8 (depends on 1)

The thermoplastic resin composition according to claim 1, further comprising a metallic soap (D).

### Claim 9 (depends on 1)

An inner liner for a pneumatic tire, comprising the thermoplastic resin composition according to claim 1.

### Claim 10 (depends on 9)

A pneumatic tire comprising the inner liner according to claim 9.

### Claim 11 (depends on 2)

The thermoplastic resin composition according to claim 2, wherein a weight ratio (B)/(C) of the brominated isobutylene-p-methylstyrene copolymer (B) and the acid-modified styrene-ethylene-butylene-styrene copolymer (C) is 60/40 to 10/90.

### Claim 12 (depends on 2)

The thermoplastic resin composition according to claim 2, comprising 20 to 300 parts by weight of the ethylene-vinyl alcohol copolymer (A) based on 100 parts by weight of elastomer components in the dispersed phase.

### Claim 13 (depends on 3)

The thermoplastic resin composition according to claim 3, comprising 20 to 300 parts by weight of the ethylene-vinyl alcohol copolymer (A) based on 100 parts by weight of elastomer components in the dispersed phase.

### Claim 14 (depends on 2)

The thermoplastic resin composition according to claim 2, wherein the vinyl alcohol content VA (% by weight) in the ethylene-vinyl alcohol copolymer (A) is 50 to 90.

### Claim 15 (depends on 3)

The thermoplastic resin composition according to claim 3, wherein the vinyl alcohol content VA (% by weight) in the ethylene-vinyl alcohol copolymer (A) is 50 to 90.

### Claim 16 (depends on 4)

The thermoplastic resin composition according to claim 4, wherein the vinyl alcohol content VA (% by weight) in the ethylene-vinyl alcohol copolymer (A) is 50 to 90.

### Claim 17 (depends on 2)

The thermoplastic resin composition according to claim 2, wherein the p-bromomethylstyrene content BB (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B) is 1.0 to 5.0.

### Claim 18 (depends on 3)

The thermoplastic resin composition according to claim 3, wherein the p-bromomethylstyrene content BB (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B) is 1.0 to 5.0.

### Claim 19 (depends on 4)

The thermoplastic resin composition according to claim 4, wherein the p-bromomethylstyrene content BB (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B) is 1.0 to 5.0.

### Claim 20 (depends on 5)

The thermoplastic resin composition according to claim 5, wherein the p-bromomethylstyrene content BB (% by weight) in the brominated isobutylene-p-methylstyrene copolymer (B) is 1.0 to 5.0.