# US 7,411,016 B2 · Rubber composition and pneumatic tire using the same for tread

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- Number: US 7,411,016 B2
- Document ID: US7411016B2
- Status: Granted
- Kind: B2
- Application number: 11/583,159
- Filed: 2006-10-19
- Published: 2007-05-17
- Granted: 2008-08-12
- Earliest claimed: 2005-11-14
- Assignees: Sumitomo Rubber Industries, Ltd.
- Inventors: Takahiro Mabuchi; Masato Naito
- Web page: https://patentgrep.com/patent/US7411016B2

## CPC

- B60C 1/0016: {Compositions of the tread}
- C08K 3/36: Silica
- C08K 5/548: containing sulfur {(C08K5/5477 takes precedence)}
- C08K 2201/016: Additives defined by their aspect ratio
- Y02T 10/86: Optimisation of rolling resistance, e.g. weight reduction
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A rubber composition for a tire tread, in which wet grip performance and dry grip performance can be improved without lowering the rolling resistance property, the rubber composition including 5 to 150 parts by weight of silica having 3 to 100 of an average aspect ratio L1/D between branched particles A-A containing branched particles A on the basis of 100 parts by weight of a rubber component containing a diene rubber, the branched particle A being a particle having contact with at least 3 other particles.

## Claims

### Claim 1

A rubber composition comprising 5 to 150 parts by weight of chain silica sol dispersed in isopropanol having 3 to 30 of an average aspect ratio L1/D between branched particles A-A containing branched particles A on the basis of 100 parts by weight of a rubber component containing a diene rubber, said branched particle A being a particle having contact with at least 3 other particles.

### Claim 2 (depends on 1)

The rubber composition of claim 1, wherein said silica has an average primary particle diameter D of 5 to 1,000 nm.

### Claim 3 (depends on 1)

The rubber composition of claim 1, comprising 1 to 20 parts by weight of a silane coupling agent on the basis of 100 parts by weight of said silica.

### Claim 4 (depends on 1)

A pneumatic tire having a tread which comprises the rubber composition of claim 1.

### Claim 5 (depends on 1)

A pneumatic tire containing an improved wet grip performance and an improved dry grip performance while maintaining rolling resistance which comprises the rubber composition of claim 1.

### Claim 6 (depends on 1)

The rubber composition of claim 1 wherein the rubber component is styrene butadiene rubber wherein styrene is present in an amount of 20 to 60% by weight.

### Claim 7 (depends on 1)

The rubber composition of claim 1 wherein the rubber component contains 3 to 100% by weight styrene.

### Claim 8 (depends on 1)

The rubber composition of claim 1, wherein the average length between branched particles A-A is 15 mm to 100,00 nm.

### Claim 9 (depends on 1)

The rubber composition of claim 1, wherein the amount of silica is 5 to 150 parts by weight based on 100 parts by weight of the rubber component.