# US 10,246,526 B2 · Vulcanized rubber composition and production method thereof

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- Number: US 10,246,526 B2
- Document ID: US10246526B2
- Status: Granted
- Kind: B2
- Application number: 15/777,008
- Filed: 2017-08-10
- Published: 2018-12-13
- Granted: 2019-04-02
- Earliest claimed: 2016-09-02
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Takuya Kageyama; Takashi Sugimoto; Susumu Innan
- Web page: https://patentgrep.com/patent/US10246526B2

## CPC

- C08C 19/25: Incorporating silicon atoms into the molecule
- B29B 7/002: {Methods (chemical aspects C08J3/00)}
- B29B 7/286: {measuring properties of the mixture, e.g. temperature, density (B29B7/283 takes precedence)}
- B29B 7/726: {Measuring properties of mixture, e.g. temperature or density (B29B7/724 takes precedence)}
- B29B 7/7495: {for mixing rubber}
- B29B 7/90: Fillers or reinforcements {, e.g. fibres}
- B60C 1/0016: {Compositions of the tread}
- C08C 19/22: Incorporating nitrogen atoms into the molecule
- C08J 3/20: Compounding polymers with additives, e.g. colouring
- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- C08K 3/36: Silica
- C08K 5/31: Guanidine; Derivatives thereof
- C08K 5/548: containing sulfur {(C08K5/5477 takes precedence)}
- C08L 7/00: Compositions of natural rubber
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- B29B 7/183: {having a casing closely surrounding the rotors, e.g. of Banbury type (with single shaft B29B7/125)}
- B29B 7/38: rotary (B29B7/52 takes precedence)
- C08J 2309/06: Copolymers with styrene
- Y02T 10/86: Optimisation of rolling resistance, e.g. weight reduction
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided is a method for producing a vulcanized rubber composition, including: a first kneading step of obtaining a kneaded mixture comprising a rubber component comprising at least one selected from the group consisting of natural rubbers and synthetic rubbers, a filler comprising an inorganic filler, and a sulfur-containing silane coupling agent; a second kneading step of adding sulfur and a vulcanization accelerator to the kneaded mixture, followed by kneading, to thereby obtain an unvulcanized rubber composition; and a vulcanization step of vulcanizing the unvulcanized rubber composition to thereby obtain a vulcanized rubber composition having a glass transition temperature of −30° C. to 0° C. by; wherein specific aminoguanidines are added, followed by kneading, in the first kneading step.

## Claims

### Claim 1

A method for producing a vulcanized rubber composition, comprising:
a first kneading step of obtaining a kneaded mixture comprising: a rubber component comprising at least one selected from the group consisting of natural rubbers and synthetic rubbers, a filler comprising an inorganic filler, and a sulfur-containing silane coupling agent;
a second kneading step of adding sulfur and a vulcanization accelerator to the kneaded mixture, followed by kneading, to thereby obtain an unvulcanized rubber composition; and
a vulcanization step of vulcanizing the unvulcanized rubber composition to thereby obtain a vulcanized rubber composition having a glass transition temperature of −30° C. or more and 0° C. or less, wherein
at least one selected from the group consisting of compounds represented by formulae (1), (2), and (3) below is added, followed by kneading, in the first kneading step:
wherein X is an acid that forms a salt together with a guanidine moiety;
wherein X is an acid that forms a salt together with a guanidine moiety, R1 and R2 are each independently any one selected from the group consisting of a hydrogen atom and an alkyl group, a cycloalkyl group, an aryl group, an alkyl aryl group, and an alkenyl group which have 1 to 18 carbon atoms, these groups each optionally having one or more substituents containing at least one selected from the group consisting of a sulfur atom, a nitrogen atom, and an oxygen atom; and
wherein X is an acid that forms a salt together with a guanidine moiety.

### Claim 2 (depends on 1)

The method for producing a vulcanized rubber composition according to claim 1, wherein
the inorganic filler comprises silica.

### Claim 3 (depends on 1)

The method for producing a vulcanized rubber composition according to claim 1, wherein
the maximum temperature in the first kneading step is 120° C. or more and 190° C. or less.

### Claim 4 (depends on 1)

The method for producing a vulcanized rubber composition according to claim 1, wherein
the temperature when adding at least one selected from the group consisting of the compounds represented by formulae (1), (2), and (3) above in the first kneading step is 120° C. or less.

### Claim 5

A vulcanized rubber composition comprising:
a rubber component comprising at least one selected from the group consisting of natural rubbers and synthetic rubbers;
an inorganic filler;
a sulfur-containing silane coupling agent;
at least one selected from the group consisting of compounds represented by formulae (1), (2), and (3) below;
sulfur; and
a vulcanization accelerator;
wherein the vulcanized rubber composition has a glass transition temperature of −30° C. or more and 0° C. or less:
wherein X is an acid that forms a salt together with a guanidine moiety;
wherein X is an acid that forms a salt together with a guanidine moiety, R1 and R2 are each independently any one selected from the group consisting of a hydrogen atom and an alkyl group, a cycloalkyl group, an aryl group, an alkyl aryl group, and an alkenyl group which have 1 to 18 carbon atoms, these groups each optionally having one or more substituents containing at least one selected from the group consisting of a sulfur atom, a nitrogen atom, and an oxygen atom; and
wherein X is an acid that forms a salt together with a guanidine moiety.

### Claim 6 (depends on 5)

The vulcanized rubber composition according to claim 5, wherein the inorganic filler comprises silica.

### Claim 7 (depends on 2)

The method for producing a vulcanized rubber composition according to claim 2, wherein
the maximum temperature in the first kneading step is 120° C. or more and 190° C. or less.

### Claim 8 (depends on 2)

The method for producing a vulcanized rubber composition according to claim 2, wherein
the temperature when adding at least one selected from the group consisting of the compounds represented by formulae (1), (2), and (3) above in the first kneading step is 120° C. or less.

### Claim 9 (depends on 3)

The method for producing a vulcanized rubber composition according to claim 3, wherein
the temperature when adding at least one selected from the group consisting of the compounds represented by formulae (1), (2), and (3) above in the first kneading step is 120° C. or less.

### Claim 10 (depends on 7)

The method for producing a vulcanized rubber composition according to claim 7, wherein
the temperature when adding at least one selected from the group consisting of the compounds represented by formulae (1), (2), and (3) above in the first kneading step is 120° C. or less.