# US 2019/0169404 A1 · Rubber composition and pneumatic tire

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- Number: US 2019/0169404 A1
- Document ID: US20190169404A1
- Status: Published application
- Kind: A1
- Application number: 16/189,405
- Filed: 2018-11-13
- Published: 2019-06-06
- Earliest claimed: 2017-12-06
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Hiroaki YAMADA
- Web page: https://patentgrep.com/patent/US20190169404A1

## CPC

- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- B60C 1/0016: {Compositions of the tread}
- C08K 3/06: Sulfur
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 5/3462: Six-membered rings
- C08K 5/378: containing heterocyclic rings
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention provides a rubber composition having good abrasion resistance and a pneumatic tire formed from the rubber composition. Provided is a rubber composition containing: a compound having a group represented by the following formula (I): wherein R11 and R12 are the same or different and each represent a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group optionally containing a heteroatom; and a sulfur atom-containing vulcanization accelerator, the rubber composition being obtained by, before kneading a rubber component with any sulfur, kneading the rubber component and the sulfur atom-containing vulcanization accelerator, and then kneading the kneaded mixture with sulfur.

## Claims

### Claim 1

A rubber composition, comprising:
a compound having a group represented by the following formula (I):
wherein R11 and R12 are the same or different and each represent a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group optionally containing a heteroatom; and
a sulfur atom-containing vulcanization accelerator,
the rubber composition being obtained by, before kneading a rubber component with any sulfur, kneading the rubber component and the sulfur atom-containing vulcanization accelerator, and then kneading the kneaded mixture with sulfur.

### Claim 2 (depends on 1)

The rubber composition according to claim 1,
wherein the rubber composition is obtained by, before kneading a rubber component with any sulfur, kneading the rubber component, the sulfur atom-containing vulcanization accelerator, and the compound, and then kneading the kneaded mixture with sulfur.

### Claim 3 (depends on 1)

The rubber composition according to claim 1,
wherein the rubber composition comprises, per 100 parts by mass of the rubber component thereof, 0.1 to 5.0 parts by mass of the compound.

### Claim 4 (depends on 1)

The rubber composition according to claim 1, which is a rubber composition for tires.

### Claim 5 (depends on 1)

A method for preparing the rubber composition according to claim 1, the method comprising:
before kneading a rubber component with any sulfur, kneading the rubber component and the sulfur atom-containing vulcanization accelerator; and
then kneading the kneaded mixture with sulfur.

### Claim 6 (depends on 1)

A method for preparing the rubber composition according to claim 1, the method comprising:
before kneading a rubber component with any sulfur, kneading the rubber component, the sulfur atom-containing vulcanization accelerator, and the compound; and
then kneading the kneaded mixture with sulfur.

### Claim 7 (depends on 1)

A pneumatic tire, comprising a tire component formed from the rubber composition according to claim 1.