RUBBER COMPOSITION FOR TIRE AND PNEUMATIC TIRE

• Main Authors: YOKOYAMA YUKA, HINOHARA YUKO
• Format: Patent
• Language: English
• Published: 24.07.2014
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide a rubber composition for a tire, which can improve a high mileage property, wet grip performance and wear resistance in a good balance and can give good processability, and to provide a pneumatic tire manufactured by using the above rubber composition.SOLUTION: The rubber composition for a tire comprises: a rubber component including a styrene butadiene rubber having 20 mass% or more of a styrene amount; silica; and a block copolymer having a weight average molecular weight Mw of 4×10or more and having at least four of block segments of a styrene monomer unit and block segments of a butadiene monomer unit. The total content of the styrene butadiene rubber and the butadiene rubber is 90 mass% or more in 100 mass% of the rubber component. The silica and the block copolymer are included by 5 to 200 parts by mass and 1 to 40 parts by mass, respectively, with respect to 100 parts by mass of the rubber component.