# US 9,518,174 B2 · Tread compound production method

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- Number: US 9,518,174 B2
- Document ID: US9518174B2
- Status: Granted
- Kind: B2
- Application number: 14/439,172
- Filed: 2013-10-29
- Published: 2015-10-08
- Granted: 2016-12-13
- Earliest claimed: 2012-10-29
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Riccardo Ascione; Davide Privitera
- Web page: https://patentgrep.com/patent/US9518174B2

## CPC

- C08L 9/06: Copolymers with styrene
- B60C 1/0016: {Compositions of the tread}
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/44: Sulfenamides
- C08K 5/548: containing sulfur {(C08K5/5477 takes precedence)}
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- 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 2205/03: containing three or more polymers in a blend
- 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)

## Abstract

A rubber compound production method including a first mixing step wherein at least one cross-linkable unsaturated-chain polymer base, silica, and a silane bonding agent in the alkoxymercaptoalkyl-silane class are mixed together; and a following mixing step wherein a curing system having at least sulphur and accelerants is added and mixed to the compound being produced. 0.2 to 5 phr of an accelerant, and 0.5 to 6 phr of a zinc salt of a fatty acid with a carbon atom number of C8 to C24 are added at the first mixing step. The accelerant is from the group of benzothiazyl-cyclohexyl-sulphenamide (CBS), benzothiazole disulphide (MBTS), N-tert-butyl-2-benzothiazylsulphenamide (TBBS), 2-mercaptobenzothiazole (MBT), zinc salts of 2-mercaptobenzothiazole (ZMBT), benzothiazyl-2-dicyclohexyl-sulphenamide (DCBS), diphenylguanidine (DPG), triphenylguanidine (TPG), diorthotolyl guanidine (DOTG), o-tolylbiguanidine (OTBG), ethylene thiourea (ETU) and their mixtures.

## Claims

### Claim 1

A rubber compound production method comprising a first mixing step wherein at least one cross-linkable unsaturated-chain polymer base, an accelerant, silica, and a silane bonding agent in the alkoxymercaptoalkyl-silane class are mixed together; and a following mixing step wherein a curing system comprising at least sulphur and accelerants is added and mixed to the compound being produced; and
wherein, in said first mixing step, 0.2 to 5 phr of said accelerant in said first mixing step, and 0.5 to 6 phr of a zinc salt of a fatty acid with a carbon atom number of C8 to C24 are added; said accelerant being from the group consisting of benzothiazyl-cyclohexyl-sulphenamide (CBS), benzothiazole disulphide (MBTS), N-tert-butyl-2- benzothiazylsulphenamide (TBBS), 2- mercaptobenzothiazole (MBT), zinc salts of 2-mercaptobenzothiazole (ZMBT), benzothiazyl-2-dicyclohexyl-sulphenamide (DCBS), diphenylguanidine (DPG), triphenylguanidine (TPG), diorthotolyl guanidine (DOTG), o-tolylbiguanidine (OTBG), ethylene thiourea (ETU) and their mixtures.

### Claim 2 (depends on 1)

A rubber compound production method as claimed in claim 1, characterized in that the fatty acid of said zinc salt has a carbon atom number of C14 to C18.

### Claim 3 (depends on 1)

A rubber compound production method as claimed in claim 1, characterized in that 4 to 18 phr of the silane bonding agent in the trialkoxymercaptoalkyl-silane class is used.

### Claim 4 (depends on 1)

A rubber compound production method as claimed in claim 1, characterized in that said silane bonding agent in the trialkoxymercaptoalkyl-silane class is of the general formula (I)
R1R22Si—R3—SH (I)
where:
R1 is a linear, cyclic, or branched alkoxyl group with 1 to 8 carbon atoms; R2 is a linear, cyclic, or branched alkoxyl group with 1 to 8 carbon atoms or —O—(Y—O)m4-X (Y is a linear, cyclic or branched saturated or unsaturated divalent hydrocarbon group with 1 to 20 carbon atoms; X is a linear, cyclic or branched alkyl group with 1 to 9 carbon atoms; and m4 is a number from 1 to 40); and R3 is a linear, cyclic or branched saturated or unsaturated alkylene group with 1 to 12 carbon atoms.

### Claim 5 (depends on 4)

A rubber compound production method as claimed in claim 4, characterized in that said silane bonding agent in the trialkoxymercaptoalkyl-silane class is a trialkoxymercaptopropyl-silane.

### Claim 6 (depends on 5)

A rubber compound production method as claimed in claim 5, characterized in that the trialkoxymercaptopropyl-silane has the formula (II)
SH(CH2)3Si(OCH2CH3)(O(CH2CH2O)5(CH2)13CH3)2 (II).

### Claim 7 (depends on 1)

A tread compound made using a method as claimed in claim 1.

### Claim 8 (depends on 7)

A tread made from a compound as claimed in claim 7.

### Claim 9 (depends on 8)

A tire comprising a tread as claimed in claim 8.