# US 11,306,201 B2 · Rubber composition for tires and tire

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- Number: US 11,306,201 B2
- Document ID: US11306201B2
- Status: Granted
- Kind: B2
- Application number: 16/881,141
- Filed: 2020-05-22
- Published: 2020-09-10
- Granted: 2022-04-19
- Earliest claimed: 2018-09-05
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Madoka Kimura
- Web page: https://patentgrep.com/patent/US11306201B2

## CPC

- 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)
- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- C08K 3/04: Carbon
- C08K 5/17: Amines; Quaternary ammonium compounds
- C08K 5/25: Carboxylic acid hydrazides
- C08K 5/41: Compounds containing sulfur bound to oxygen
- C08F 36/08: Isoprene
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2207/04: Thermoplastic elastomer
- 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)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Provided are a rubber composition for tires having excellent low fuel consumption and having crack resistance and tear resistance, which contains a rubber component (A) containing a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less, and a cis-1,4-bond content of 96% or more, a carbon black (B), and a specific carbon black dispersant (C); and a tire using the rubber composition.

## Claims

### Claim 1

A rubber composition for tires, comprising a rubber component (A) that contains a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less, and a cis-1,4-bond content of 96% or more, a carbon black (B), and a carbon black dispersant (C) of at least one selected from a compound represented by any of the following general formulae (1) to (6), and a salt, a solvate and a solvate of the salt of a compound represented by the following general formula (5):
wherein,
in the general formula (1), A11 represents an aryl group, a hydantoin skeleton-having group or a linear hydrocarbon group with 1 to 18 carbon atoms, which may have at least one polar group; R11 and R12 each independently represent a hydrogen atom, an acyl group, an amide group, an alkyl group, a cycloalkyl group or an aryl group;
in the general formula (2), A21 represents an aryl group, a hydantoin skeleton-having group or a linear hydrocarbon group with 1 to 18 carbon atoms, which may have at least one polar group; R21 represents an alkanediyl group, a cycloalkanediyl group or an arenediyl group;
in the general formula (3), A31 represents an arenediyl group, a hydantoin skeleton-having group or a linear hydrocarbon group with 1 to 18 carbon atoms, which may have at least one polar group; R31 and R32 each independently represent an alkanediyl group, a cycloalkanediyl group or an arenediyl group;
in the general formula (4), R41 represents an alkanediyl group with 1 to 6 carbon atoms;
in the general formula (5), R51 represents an alkanediyl group with 1 to 12 carbon atoms, a cycloalkanediyl group with 3 to 12 carbon atoms, or —B51-A51-B52—; A51 represents an arenediyl group with 6 to 12 carbon atoms; B51 and B52 each independently represent a single bond or an alkanediyl group with 1 to 12 carbon atoms; R52 and R53 each independently represent a hydrogen atom, a halogen atom, an alkyl group with 1 to 6 carbon atoms, an aryl group with 6 to 12 carbon atoms, a hydroxy group, or an alkoxy group with 1 to 6 carbon atoms, or bonding to each other to form a cyclic structure; R54 represents a hydroxy group, an alkoxy group with 1 to 6 carbon atoms, an aryloxy group with 6 to 12 carbon atoms, an arylalkoxy group with 7 to 15 carbon atoms, —NR55R56 or —O—((Y51)n+)1/n; R55 and R56 each independently represent a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 12 carbon atoms; (Y51)n+ represents an n-valent cation capable of forming a carboxylate salt; and X51 represents —NH— or —O—; and
in the general formula (6), R61 and R62 each independently represent a hydrogen atom or an alkyl group with 1 to 6 carbon atoms, or bonding to each other to form a cyclic structure; (M61)n+ represents H+or an n-valent metal ion; m represents an integer of 2 to 9; and n represents an integer of 1 or 2; and
wherein the content of components having a molecular weight of less than 200,000 in the synthetic isoprene is less than 10% by mass.

### Claim 2 (depends on 1)

The rubber composition for tires according to claim 1, wherein the content of the synthetic isoprene in the rubber component (A) is 30% by mass or more and 100% by mass or less.

### Claim 3 (depends on 1)

The rubber composition for tires according to claim 1, wherein the content of the carbon black (B) is 20 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the rubber component (A).

### Claim 4 (depends on 1)

The rubber composition for tires according to claim 1, wherein the carbon black dispersant (C) is at least one selected from the compounds represented by the general formulae (1) to (3).

### Claim 5 (depends on 4)

The rubber composition for tires according to claim 4, wherein, in the general formulae (1) to (3), A11 and A21 each are independently an aryl group having at least one polar group, and A31 is an arenediyl group.

### Claim 6 (depends on 5)

The rubber composition for tires according to claim 5, wherein the polar group is a group selected from an amino group, a hydroxy group and a nitro group.

### Claim 7 (depends on 4)

The rubber composition for tires according to claim 4, wherein, in the general formulae (1) to (3), R11 and R12 each are independently a hydrogen atom or an alkyl group, R21 is an alkanediyl group, and R31 and R32 each are independently an alkanediyl group.

### Claim 8 (depends on 1)

The rubber composition for tires according to claim 1, wherein the content of the carbon black dispersant (C) is 0.1 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the rubber component (A).

### Claim 9 (depends on 1)

A tire using a rubber composition of claim 1.

### Claim 10 (depends on 2)

A tire using a rubber composition of claim 2.

### Claim 11 (depends on 2)

The rubber composition for tires according to claim 2, wherein the content of the carbon black (B) is 20 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the rubber component (A).

### Claim 12 (depends on 2)

The rubber composition for tires according to claim 2, wherein the carbon black dispersant (C) is at least one selected from the compounds represented by the general formulae (1) to (3).

### Claim 13 (depends on 2)

The rubber composition for tires according to claim 2, wherein the content of the carbon black dispersant (C) is 0.1 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the rubber component (A).

### Claim 14 (depends on 3)

The rubber composition for tires according to claim 3, wherein the carbon black dispersant (C) is at least one selected from the compounds represented by the general formulae (1) to (3).