# US 8,785,542 B2 · Rubber composition and tire

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- Number: US 8,785,542 B2
- Document ID: US8785542B2
- Status: Granted
- Kind: B2
- Application number: 14/233,052
- Filed: 2012-09-21
- Published: 2014-06-05
- Granted: 2014-07-22
- Earliest claimed: 2011-09-30
- Assignees: Kuraray Co., Ltd.; Amyris, Inc.
- Applicants: Kuraray Co., Ltd.; Amyris, Inc.
- Inventors: Shigenao Kuwahara; Kei Hirata; Daisuke Koda
- Web page: https://patentgrep.com/patent/US8785542B2

## CPC

- C08L 7/00: Compositions of natural rubber
- B60C 1/0016: {Compositions of the tread}
- C08F 136/22: the radical having three or more carbon-to-carbon double bonds
- C08K 3/04: Carbon
- C08L 9/06: Copolymers with styrene
- C08L 21/00: Compositions of unspecified rubbers
- 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: 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
- 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)

## Abstract

The present invention relates to a rubber composition including (A) at least one rubber component selected from the group consisting of a synthetic rubber and a natural rubber; (B) a polymer of farnesene having a weight-average molecular weight of not less than 2,000 and less than 25,000; and (C) carbon black.

## Claims

### Claim 1

A rubber composition, comprising:
(A) at least one rubber component selected from the group consisting of a synthetic rubber and a natural rubber;
(B) from 0.1 to 100 parts by mass of a polymer of farnesene having a weight-average molecular weight of not less than 2,000 and less than 25,000, based on 100 parts by mass of the rubber component (A); and
(C) from 0.1 to 100 parts by mass of carbon black having an average particle size of from 5 to 100 nm, based on 100 parts by mass of the rubber component (A).

### Claim 2 (depends on 1)

The rubber composition of claim 1, wherein the polymer (B) is a homopolymer of β-farnesene.

### Claim 3 (depends on 1)

The rubber composition of claim 1, wherein the polymer (B) has a melt viscosity of from 0.1 to 3.5 Pa·s as measured at 38° C.

### Claim 4 (depends on 1)

The rubber composition of claim 1, wherein the synthetic rubber is at least one rubber selected from the group consisting of a styrene-butadiene rubber, a butadiene rubber and an isoprene rubber.

### Claim 5 (depends on 4)

The rubber composition of claim 4, wherein the styrene-butadiene rubber has a weight-average molecular weight of from 100,000 to 2,500,000.

### Claim 6 (depends on 4)

The rubber composition of claim 4, wherein the styrene-butadiene rubber has a styrene content of from 0.1 to 70% by mass.

### Claim 7 (depends on 4)

The rubber composition of claim 4, wherein the butadiene rubber has a weight-average molecular weight of from 90,000 to 2,000,000.

### Claim 8 (depends on 4)

The rubber composition of claim 4, wherein the butadiene rubber has a vinyl content of 50% by mass or less.

### Claim 9 (depends on 1)

The rubber composition of claim 1, wherein the polymer (B) has a molecular weight distribution (Mw/Mn) of from 1.0 to 2.0.

### Claim 10 (depends on 1)

A tire, comprising at least partially the rubber composition of claim 1.