# US 10,119,014 B2 · Rubber composition for tires, and pneumatic tire

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- Number: US 10,119,014 B2
- Document ID: US10119014B2
- Status: Granted
- Kind: B2
- Application number: 14/343,342
- Filed: 2012-10-16
- Published: 2014-07-10
- Granted: 2018-11-06
- Earliest claimed: 2011-10-17
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Soh Ishino
- Web page: https://patentgrep.com/patent/US10119014B2

## CPC

- C08L 9/06: Copolymers with styrene
- B60C 1/0016: {Compositions of the tread}
- C08C 19/22: Incorporating nitrogen atoms into the molecule
- C08C 19/44: of polymers containing metal atoms exclusively at one or both ends of the skeleton
- C08L 15/00: Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence)
- C08L 2312/00: Crosslinking
- 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
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

## Abstract

Provided are: a rubber composition for tires capable of improving fuel economy, wet grip performance, and abrasion resistance; and a pneumatic tire including the same. Included is a rubber composition for tires including: a diene polymer; silica; and a liquid resin having a softening point of −20 to 20° C., the diene polymer being a modified diene polymer obtained by reacting components (A) and (B), the liquid resin being present in an amount of 3-40 parts by mass per 100 parts by mass of the rubber component, the component (A) being an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer, in the presence of a component (C), the component (B) being a modifier containing a functional group, the component (C) being a chemical species obtained by reacting an organic alkali metal compound and a compound of Formula (1) below.

## Claims

### Claim 1

A rubber composition for tires, comprising:
a diene polymer;
silica; and
a liquid resin having a softening point of −20° C. to 20° C., which is at least one selected from the group consisting of liquid coumarone-indene resins, liquid indene resins, and liquid α-methylstyrene resins,
the diene polymer being a modified diene polymer obtained by reacting a component (A) and a component (B),
the liquid resin being present in an amount of 3 to 40 parts by mass per 100 parts by mass of a rubber component of the rubber composition,
the silica being present in an amount of 30 to 120 parts by mass per 100 parts by mass of a rubber component of the rubber composition,
the component (A) being an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer, in the presence of a component (C), wherein the conjugated diene monomer is at least one of 1,3-butadiene or isoprene, and the aromatic vinyl monomer is styrene,
the component (B) being a modifier containing a functional group,
the component (C) being a chemical species obtained by reacting an organic alkali metal compound and a compound represented by the following Formula (2):
wherein R1 and R2 are the same as or different from each other, each representing a hydrogen atom, a branched or unbranched alkyl group, or a branched or unbranched aryl group, and
the component (B) modifier being a compound represented by the following Formula (3):
wherein R3 and R4 are the same as or different from each other, each representing a C1 to C3 alkylene group; R5 and R6 both represent a hydrogen atom; R7 represents a C6 to C10 cycloalkylene group; and n represents an integer of 2.

### Claim 2 (depends on 1)

The rubber composition for tires according to claim 1, wherein the same component (B) modifier is introduced into both chain ends of the active conjugated diene polymer.

### Claim 3 (depends on 1)

The rubber composition for tires according to claim 1, wherein the rubber component contains 5% by mass or more of the diene polymer based on 100% by mass of the rubber component.

### Claim 4 (depends on 1)

The rubber composition for tires according to claim 1, wherein the modified diene polymer is a modified styrene butadiene rubber obtained by polymerizing 1,3-butadiene and styrene.

### Claim 5 (depends on 1)

The rubber composition for tires according to claim 1, wherein the silica has a nitrogen adsorption specific surface area of 40 to 250 m2/g.

### Claim 6 (depends on 1)

The rubber composition for tires according to claim 1, comprising
at least one of a silane coupling agent represented by Formula (4) below and a silane coupling agent containing a linking unit A represented by Formula (5) below and a linking unit B represented by Formula (6) below:
wherein R8 represents a group represented by —O—(R12—O)m—R13 where m R12s are the same as or different from one another, each representing a branched or unbranched divalent C1 to C30 hydrocarbon group, R13 represents a branched or unbranched C1 to C30 alkyl group, a branched or unbranched C2 to C30 alkenyl group, a C6 to C30 aryl group, or a C7 to C30 aralkyl group, and m represents an integer of 1 to 30; R9 and R10 are the same as or different from each other, each representing a group as defined for R8, a branched or unbranched C1 to C12 alkyl group, or a group represented by —O—R14 where R14 represents a hydrogen atom, a branched or unbranched C1 to C30 alkyl group, a branched or unbranched C2 to C30 alkenyl group, a C6 to C30 aryl group, or a C7 to C30 aralkyl group; and R11 represents a branched or unbranched C1 to C30 alkylene group;
wherein R15 represents hydrogen, a halogen, a branched or unbranched C1 to C30 alkyl group, a branched or unbranched C2 to C30 alkenyl group, a branched or unbranched C2 to C30 alkynyl group, or a group obtained by replacing a terminal hydrogen of the alkyl group with a hydroxyl or carboxyl group; and R16 represents a branched or unbranched C1 to C30 alkylene group, a branched or unbranched C2 to C30 alkenylene group, or a branched or unbranched C2 to C30 alkynylene group, provided that R15 and R16 together may form a ring.

### Claim 7 (depends on 1)

The rubber composition for tires according to claim 1, further comprising a vulcanization accelerator represented by the following Formula (7):
(C6H5—CH2)2N—(C═S)—Sz—(C═S)—N(CH2—C6H5)2 (7)
wherein z represents an integer of 1 to 8.

### Claim 8 (depends on 1)

A pneumatic tire having a tread formed from the rubber composition for tires according to claim 1.

### Claim 9 (depends on 1)

A pneumatic tire, comprising the rubber composition according to claim 1.

### Claim 10 (depends on 6)

The rubber composition for tires according to claim 6, wherein the same component (B) modifier is introduced into both chain ends of the active conjugated diene polymer.

### Claim 11 (depends on 6)

The rubber composition for tires according to claim 6, wherein the rubber component contains 5% by mass or more of the diene polymer based on 100% by mass of the rubber component.

### Claim 12 (depends on 2)

The rubber composition for tires according to claim 2, wherein the rubber component contains 5% by mass or more of the diene polymer based on 100% by mass of the rubber component.