Sumitomo Rubber Industries Limited

Yuhei Yamashiro

Tatsuya Miyazaki

Soh Ishino

Takayuki Hattori

Takao Wada

Takayuki Nagase

Ryota Kitago

Masanobu Nakamura

Masaki Oshimo

Hayato Yoshiyasu

Takeo Nakazono

Kazuya Torita

Yuuki Kawana

Ayuko Yamana

Provided is a pneumatic tire achieving a balanced improvement of steering stability, fuel economy, and processability. The pneumatic tire is formed from a rubber composition which includes: a rubber component; a plasticizer component; and a filler component. The rubber component includes: a diene rubber; and a copolymer containing an aromatic moiety as a structural unit derived from an aromatic vinyl compound and an ethylene moiety as a structural unit derived from ethylene. The ethylene moiety is present in an amount of 15 to 70% by mass based on 100% by mass of the total structural units of the copolymer excluding the aromatic moiety. The copolymer is present in an amount of 5 to 60% by mass based on 100% by mass of the rubber component. The rubber composition satisfies the following relationship: B/A=0.45 to 0.65.

Pneumatic tire

An object of the present invention is to provide a rubber composition which is excellent in wet grip performance and abrasion resistance without deteriorating fuel efficiency, and a tire having a tread composed of the rubber composition. The present invention relates to a rubber composition comprising a rubber component comprising 20 to 90% by mass of a rubber component A and 10 to 80% by mass of a rubber component B, wherein an SP value of the rubber component A is not less than 17.8 (J/cm)and an SP value of the rubber component B is lower than the SP value of the rubber component A by not less than 0.6 (J/cm), and a tire having a tread composed of the rubber composition.

Rubber composition and tire

Provided is a pneumatic tire having well-improved fuel economy, rubber tensile strength, and abrasion resistance while maintaining adequate productivity. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing a hydrogenated copolymer and a sulfur donor, the hydrogenated copolymer containing a structural unit derived from an aromatic vinyl compound and a structural unit derived from a conjugated diene compound and having a degree of hydrogenation of the conjugated diene portion of 75 mol % or more, the hydrogenated copolymer being present in an amount of 75% by mass or more based on 100% by mass of a rubber component in the rubber composition, the sulfur donor being present in an amount of 0.2 to 8 parts by mass per 100 parts by mass of the rubber component.

Pneumatic tire and method for producing pneumatic tire

The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, abrasion resistance, and processability. A pneumatic tire formed from a rubber composition, the rubber composition containing a rubber component including a hydrogenated copolymer and a general purpose rubber, the hydrogenated copolymer containing a structural unit derived from an aromatic vinyl compound and a structural unit derived from a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene portion of 30 to 100 mol %, a weight average molecular weight of 50,000 to 2,000,000, and a styrene content of 5% to 50% by mass, the general purpose rubber being at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene rubber, and polybutadiene rubber, the rubber component including, based on 100% by mass thereof, 10% to 80% by mass of the hydrogenated copolymer.

The present invention provides a pneumatic tire with well improved fuel economy, rubber tensile strength, and abrasion resistance. The present invention relates to a pneumatic tire formed from a rubber composition, the rubber composition containing: a hydrogenated copolymer obtained by copolymerization of an aromatic vinyl compound and a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene units of 75 mol % or more; silica; and a silane coupling agent 1 containing a carbonylthio group (&#x2014;S&#x2014;C(&#x2550;O)&#x2014;) but no mercapto group (&#x2014;SH) and/or a silane coupling agent 2 containing a mercapto group (&#x2014;SH), the rubber composition containing, per 100% by mass of a rubber component, 75% by mass or more of the hydrogenated copolymer.

The present invention aims to provide pneumatic tires that can achieve both abrasion resistance and low heat build-up properties. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition containing: a rubber component including an isoprene-based rubber and a high-cis polybutadiene rubber having a cis content of 90% by mass or more; one or more types of carbon black; and sulfur, at least one of the one or more types of carbon black being produced from a feedstock oil that has a BMCI value of 150 or less and an aliphatic hydrocarbon content of 30% by mass or more, the BMCI value being calculated from the average boiling point T (&#xb0; C.) and the specific gravity D (60/60&#xb0; F.) relative to water at 60&#xb0; F. according to the equation below,=48,640/(+273)+473.7&#x2212;456.8.

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Kobe, Japan

Yuhei Yamashiro