METHOD FOR MANUFACTURING RUBBER COMPOSITION FOR TIRE AND METHOD FOR MANUFACTURING TIRE

• US 20180297403A1
• Filed: 09/21/2016
• Published: 10/18/2018
• Est. Priority Date: 10/27/2015
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: KITAGO, Ryota, TOKIMUNE, Ryuichi, ISHINO, Soh
• Granted Patent: US 11,571,931 B2
• Time in Patent Office: Days
• CPC Class Codes: B60C 1/00 Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• CPC Class Codes: B60C 1/0016 Compositions of the tread
• CPC Class Codes: C08J 3/20 Compounding polymers with additives, e.g. colouring
• CPC Class Codes: C08J 3/24 Crosslinking, e.g. vulcanising, of macromolecules mechanical aspects B29C35/00; crosslinking agents C08K
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/36 Sulfur-, selenium-, or tellurium-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 9/06 Copolymers with styrene
• CPC Class Codes: Y02T 10/86 Optimisation of rolling resistance, e.g. weight reduction

Abstract

Provided are a method for manufacturing a rubber composition for a tire and a method for manufacturing a tire including this manufacturing method for the rubber composition in the present invention, which are characterized by including the steps of: starting to knead a rubber component, a sulfur donor, and a sulfur atom-containing vulcanization accelerator together before kneading the rubber component with a filler; and then adding a filler to an obtained kneaded product and performing kneading at a kneading temperature of 120° C. or higher. According to the manufacturing methods of the present invention, a rubber composition for a tire and a tire which have good fracture property can be manufactured.

Claims

1. A method for manufacturing a rubber composition for a tire, comprising the steps of:

starting to knead a rubber component, a sulfur donor, and a sulfur atom-containing vulcanization accelerator together before kneading the rubber component with a filler; and

then adding a filler to an obtained kneaded product and performing kneading at a kneading temperature of 120°

C. or higher.

2. The method for manufacturing a rubber composition for a tire of claim 1,

wherein after adding the filler and performing kneading at the kneading temperature of 120°

C. or higher, a vulcanization agent is kneaded therein.

3. The method for manufacturing a rubber composition for a tire of claim 1,

wherein the rubber component contains 20% by mass or more of a styrene butadiene rubber in which a vinyl content is 20% or more.

4. The method for manufacturing a rubber composition for a tire of claim 1,

wherein after adding the filler and performing kneading at the kneading temperature of 120°

C. or higher, a vulcanization accelerator is added and kneaded in the kneaded product such that a mass ratio of a compounding amount of the vulcanization accelerator to a compounding amount of the sulfur atom-containing vulcanization accelerator is more than 0% and 80% or less.

5. A method for manufacturing a tire, comprising the steps of:

molding a green tire by forming a tire member from the rubber composition for a tire obtained in the manufacturing method of claim 1 and combining the tire member with other tire members; and

vulcanizing the green tire obtained in the molding step.