# US 9,518,172 B2 · Rubber composition and method for producing rubber composition

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- Number: US 9,518,172 B2
- Document ID: US9518172B2
- Status: Granted
- Kind: B2
- Application number: 14/381,079
- Filed: 2013-02-26
- Published: 2015-01-29
- Granted: 2016-12-13
- Earliest claimed: 2012-03-02
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Takeshi Shiono; Takumi Toda; Satoshi Horie
- Web page: https://patentgrep.com/patent/US9518172B2

## CPC

- C08K 13/02: Organic and inorganic ingredients
- C08K 3/06: Sulfur
- C08K 3/36: Silica
- C08K 5/175: {containing COOH-groups; Esters or salts thereof}
- C08K 5/3415: Five-membered rings
- C08K 5/37: Thiols
- C08K 5/548: containing sulfur {(C08K5/5477 takes precedence)}
- C08L 7/00: Compositions of natural rubber
- C08L 9/06: Copolymers with styrene
- C08L 21/00: Compositions of unspecified rubbers
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention provides a rubber composition comprising, as blended, a rubber component (A), an amino acid derivative (B) and a filler containing an inorganic filler (C), and further containing, as incorporated therein, at least one selected from sulfur and a sulfur compound. The vulcanization rate of the rubber composition is accelerated and the low-heat-generation property thereof is excellent.

## Claims

### Claim 1

A rubber composition comprising, as blended, a rubber component (A), an amino acid derivative (B) and a filler containing an inorganic filler (C), and further containing, as incorporated therein, at least one selected from sulfur and a sulfur compound, in which the amino acid derivative (B) is represented by the following formula (Ic):
in the formula, X represents a divalent hydrocarbon group having a linear alkylene group and having from 1 to 10 carbon atoms, Y and Z each independently represent a single bond or an alkylene group having from 1 to 10 carbon atoms, Rh is selected from a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group and an alkali metal, Rj and Rk are a hydrogen atom, the —COO moiety may form a salt with an amine, the —NRjRk moiety may form a salt with an acid, however, when Rh is a hydrogen atom, the compound must form a salt, and in case where the compound does not form a salt, Rh is not a hydrogen atom.

### Claim 2 (depends on 1)

The rubber composition according to claim 1, wherein the amino acid derivative (B) represented by formula (Ic) is selected from the group consisting of the following formulae (a), (b), (c) and (d):

### Claim 3

A method for producing a rubber composition containing a rubber component (A), an amino acid derivative (B) and a filler containing an inorganic filler (C), which comprises:
a first kneading stage of kneading the rubber component (A), the amino acid derivative (B) and all or a part of the inorganic filler (C), and
a final kneading stage of, after the first kneading stage, adding thereto at least one selected from sulfur and a sulfur compound and kneading them, in which the amino acid derivative (B) is represented by the following formula (Ic):
in the formula, X represents a divalent hydrocarbon group having a linear alkylene group and having from 1 to 10 carbon atoms, Y and Z each independently represent a single bond or an alkylene group having from 1 to 10 carbon atoms, Rh is selected from a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group and an alkali metal, Rj and Rk are a hydrogen atom, the —COO moiety may form a salt with an amine, the —NRjRk moiety may form a salt with an acid, however, when Rh is a hydrogen atom, the compound must form a salt, and in case where the compound does not form a salt, Rh is not a hydrogen atom.

### Claim 4 (depends on 3)

The method for producing a rubber composition according to claim 3, wherein in the first kneading stage, after the rubber component (A) and all or a part of the inorganic filler (C) are kneaded, the amino acid derivative (B) is added thereto and further kneaded.

### Claim 5 (depends on 3)

The method for producing a rubber composition according to claim 3, wherein the amino acid derivative (B) represented by formula (Ic) is selected from the group consisting of the following formulae (a), (b), (c) and (d):