Sumitomo Rubber Industries Limited

Yuko Hinohara

Takahiro Mabuchi

Kazuyuki Nishioka

Ryuichi Tokimune

The present invention relates to a rubber composition for a tire that includes silica and a rubber component that contains not less than 5% by mass of a conjugated diene polymer, based on 100% by mass of the rubber component, the conjugated diene polymer containing a constituent unit derived from a conjugated diene and a constituent unit represented by the following formula (I): at least one terminal of the conjugated diene polymer being modified by a compound represented by the following formula (II): 

Rubber composition and pneumatic tire

The present invention provides a rubber composition that enables to improve the fuel economy, wet-grip performance, abrasion resistance, and processability in a balanced manner, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition containing silica and a conjugated diene polymer, the conjugated diene polymer being obtained by reacting a compound containing a nitrogen atom and/or a silicon atom with an active end of a copolymer obtained by polymerizing a monomer component including a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the following formula (I): wherein an amount of the conjugated diene polymer is not more than 90% by mass based on 100% by mass of a rubber component of the rubber composition, and an amount of the silica is 10 to 150 parts by mass per 100 parts by mass of the rubber component.

The present invention provides a rubber composition that achieves a well-balanced improvement in fuel economy, wet-grip performance, and abrasion resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition, including a rubber component and silica, wherein the rubber component contains not less than 5% by mass of a conjugated diene polymer, based on 100% by mass of the rubber component, the conjugated diene polymer containing a constituent unit derived from a conjugated diene and a constituent unit represented by the following formula (I): at least one terminal of the conjugated diene polymer being modified by a compound containing a group represented by the following formula (II): and wherein the silica is contained in an amount of 5 to 150 parts by mass per 100 parts by mass of the rubber component.

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Kobe, Japan

Yuko Hinohara