# US 10,245,888 B2 · Rubber composition for tires and pneumatic tire

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- Number: US 10,245,888 B2
- Document ID: US10245888B2
- Status: Granted
- Kind: B2
- Application number: 15/882,012
- Filed: 2018-01-29
- Published: 2018-08-16
- Granted: 2019-04-02
- Earliest claimed: 2017-02-13
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Masaki Oshimo
- Web page: https://patentgrep.com/patent/US10245888B2

## CPC

- B60C 1/0016: {Compositions of the tread}
- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- C08F 222/10: Esters
- C08F 236/06: Butadiene
- C08F 236/10: with vinyl-aromatic monomers
- C08K 3/36: Silica
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L 9/06: Copolymers with styrene
- C08L 47/00: Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00)
- C08L 2207/53: Core-shell polymer
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided is a rubber composition for tires achieving a balanced improvement of fuel economy, abrasion resistance, and road noise-reducing properties. The present invention relates to a rubber composition for tires, containing a core-shell structured particle including a core and a shell, the core having a melt viscosity at 38° C. of 0.1 to 3,000 Pa·s, the shell being formed of a polymer of a conjugated diene compound and/or an aromatic vinyl compound.

## Claims

### Claim 1

A pneumatic tire, comprising a tire component formed from a rubber composition for tires, the rubber composition comprising;
a rubber component and
a core-shell structured particle comprising a core and a shell,
wherein
the core has a melt viscosity at 38° C. of 0.1 to 3,000 Pa·s, and
the shell is formed of a polymer of at least one of a conjugated diene compound or an aromatic vinyl compound.

### Claim 2 (depends on 1)

The pneumatic tire according to claim 1, wherein the core is formed of at least one selected from the group consisting of a polymer of a compound represented by the following formula (1), a copolymer of a conjugated diene compound and an aromatic vinyl compound, a copolymer of a conjugated diene compound and a compound of formula (1), a copolymer of an aromatic vinyl compound and a compound of formula (1), and a copolymer of a conjugated diene compound, an aromatic vinyl compound, and a compound of formula (1),
wherein R11 and R12 are the same or different and each represent a hydrogen atom or a C1-C30 hydrocarbon group.

### Claim 3 (depends on 2)

The pneumatic tire according to claim 2, wherein the core-shell structured particle comprises, per 100% by mass thereof, 5% to 95% by mass of the core and 5% to 95% by mass of the shell.

### Claim 4 (depends on 3)

The pneumatic tire according to claim 3, wherein the core-shell structured particle has an average particle size of 100 to 10,000 nm.

### Claim 5 (depends on 4)

The pneumatic tire according to claim 4, wherein the rubber composition comprises, per 100 parts by mass of the rubber component therein, 1 to 50 parts by mass of the core-shell structured particle.

### Claim 6 (depends on 5)

The pneumatic tire according to claim 5, wherein the rubber composition comprises at least one of carbon black or silica.

### Claim 7 (depends on 1)

The pneumatic tire according to claim 1, wherein the core-shell structured particle comprises, per 100% by mass thereof, 5% to 95% by mass of the core and 5% to 95% by mass of the shell.

### Claim 8 (depends on 1)

The pneumatic tire according to claim 1, wherein the core-shell structured particle has an average particle size of 100 to 10,000 nm.

### Claim 9 (depends on 1)

The pneumatic tire according to claim 1, wherein the rubber composition comprises, per 100 parts by mass of the rubber component therein, 1 to 50 parts by mass of the core-shell structured particle.

### Claim 10 (depends on 1)

The pneumatic tire according to claim 1, wherein the rubber composition comprises at least one of carbon black or silica.