Preparation method of rubber composition for tire and production method of tire

Patent metadata

Field	Value
Publication number	US-10759925-B2
Application number	US-201715706232-A
Country	US
Kind code	B2
Filing date	Sep 15, 2017
Priority date	Sep 30, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A preparation method of a rubber composition for a tire assures that good processability can be obtained even if a silane coupling agent having a mercapto group is blended. The preparation method of a rubber composition for a tire characterized by initiating kneading of a rubber component and a compound of the formula (1) before kneading the rubber component and a silane coupling agent having a mercapto group.

(Wherein R 1 represents a straight-chain or branched chain alkyl group having 1 to 18 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and R 2 and R 3 together with nitrogen bonded thereto form a succinimide group, a maleimide group or a phthalimide group.)

First claim

What is claimed is:

1. A method of preparing a rubber composition for a tire comprising initiating kneading of a rubber component and a polysulfide compound represented by the following formula (1) before kneading the rubber component and a silane coupling agent having a mercapto group:

wherein R 1 represents a straight-chain or branched chain alkyl group having 1 to 18 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and R 2 and R 3 together with nitrogen bonded thereto form a succinimide group, a maleimide group or a phthalimide group.

2. The preparation method of claim 1 , wherein the rubber component comprises not less than 50% by mass of a diene rubber having a styrene content of 25 to 50% by mass and an amount of a vinyl bond of 10 to 35 mole %.

3. The preparation method of claim 2 , wherein the styrene content is not less than 2 times the amount of a vinyl bond.

4. The preparation method of claim 1 , wherein the silane coupling agent having a mercapto group is a compound represented by the following formula (2) and/or a compound comprising a bonding unit A represented by the following formula (3) and a bonding unit B represented by the following formula (4):

wherein R 101 to R 103 represent a straight-chain or branched chain alkyl group having 1 to 12 carbon atoms, a straight-chain or branched chain alkoxy group having 1 to 12 carbon atoms, or a group represented by —O—(R 111 —O) z —R 112 (z R 111 s represent straight-chain or branched chain divalent hydrocarbon groups having 1 to 30 carbon atoms, z R 111 s may be the same or different, R 112 represents a straight-chain or branched chain alkyl group having 1 to 30 carbon atoms, a straight-chain or branched chain alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms or an aralkyl group having 7 to 30 carbon atoms, z represents an integer of 1 to 30), R 101 to R 103 may be the same or different, and R 104 represents a straight-chain or branched chain alkylene group having 1 to 6 carbon atoms,

wherein x is an integer of 0 or more, y is an integer of 1 or more, R 201 represents a hydrogen atom, a halogen atom, a straight-chain or branched chain alkyl group having 1 to 30 carbon atoms, a straight-chain or branched chain alkenyl group having 2 to 30 carbon atoms, a straight-chain or branched chain alkynyl group having 2 to 30 carbon atoms, or the alkyl group in which a terminal hydrogen atom has been replaced with a hydroxyl group or a carboxyl group, R 202 represents a straight-chain or branched chain alkylene group having 1 to 30 carbon atoms, a straight-chain or branched chain alkenylene group having 2 to 30 carbon atoms, or a straight-chain or branched chain alkynylene group having 2 to 30 carbon atoms, and a ring structure may be formed with R 201 and R 202 .

5. A method of producing a tire comprising a step of forming a tire member from the rubber composition for tire obtained by the preparation method of claim 1 and forming a green tire by combining the tire member with other tire members, and a vulcanization step of vulcanizing the green tire obtained in the forming step.

6. A rubber composition for tire comprising a rubber component, a silane coupling agent having a mercapto group and a polysulfide compound represented by the following formula (1), which is prepared by kneading the silane coupling agent having a mercapto group with the rubber component with which the polysulfide compound is kneaded,

wherein R 1 represents a straight-chain or branched chain alkyl group having 1 to 18 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and R 2 and R 3 together with nitrogen bonded thereto form a succinimide group, a maleimide group or a phthalimide group.

Assignees

• Sumitomo Rubber Ind

Inventors

• Tanaka Tatsuhiro
• Nagase Takayuki
• Ikeda Keiji

Classifications

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K5/44

  Sulfenamides · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title