Sumitomo Rubber Industries Limited

Masaki Oshimo

Toshifumi Haba

Takayuki Hattori

Takao Wada

Takahiro Mabuchi

Ryota Kitago

Soh Ishino

Takayuki Nagase

Kenya Watanabe

Daisuke Sato

Masanobu Nakamura

Yuhei Yamashiro

Yuuki Kawana

You Toshima

Kento Hisajima

Masataka Toyoda

A tire having a tread composed of a rubber composition that includes a rubber component, wherein the tread has at least one circumferential main groove extending continuously in a tire circumferential direction, wherein, at a bending part in a plurality, the circumferential main groove bends and extends in the tire circumferential direction such that a center line of the circumferential main groove deviates in a tire width direction or an extending direction of the center line of the circumferential main groove changes preceding and following the bending part, and wherein the rubber composition has tan δ at 20° C. (20° C. tan δ) of 0.30 or less, and breaking strength TB (MPa) at 175° C. and elongation at break EB (%) at 175° C. satisfying a relational expression of TB×EB/2≥600.

Tire

A pneumatic tire having a tire component prepared by use of a rubber composition according to the present invention which comprises: a polybitadiene (i) which satisfies conditions of (A) a Mooney viscosity (ML) of 43 to 70, (B) a ratio (Tcp/ML) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML) of 0.9 to 1.7, (C) a stress relaxation time (T80), being a time until a torque is attenuated by 80% assuming that the torque at the end of MLmeasurement is 100%, of 10.0 to 40.0 seconds, (D) a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and (F) a proportion of cis-structure in microstructural analysis of not more than 98 mol %; another rubber (ii); and a rubber reinforcing material (iii), is excellent in processability and properties of tire.

Pneumatic tire

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.

Rubber composition and pneumatic tire

Provided is a rubber composition that achieves a balanced improvement in fuel economy, abrasion resistance, and wet grip performance while having good processability. Also provided is a pneumatic tire including a tread formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer; and carbon black and/or silica, the copolymer containing a structural unit derived from a conjugated diene monomer and a structural unit derived from a compound represented by the following formula (1): wherein Rrepresents a C1-C30 hydrocarbon group.

Rubber composition and pneumatic tire comprising tread formed from said rubber composition

Provided is a rubber composition for tires achieving a balanced improvement of fuel economy, abrasion resistance, and road noise-reducing properties. The present invention relates to a rubber composition for tires, containing a core-shell structured particle including a core and a shell, the core having a melt viscosity at 38&#xb0; C. of 0.1 to 3,000 Pa&#xb7;s, the shell being formed of a polymer of a conjugated diene compound and/or an aromatic vinyl compound.

Rubber composition for tires and pneumatic tire

Provided are a rubber composition that shows a balanced improvement in fuel economy and abrasion resistance while having good processability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer containing a structural unit derived from a conjugated diene monomer, a structural unit derived from farnesene, and a structural unit derived from a compound represented by the formula (1) below; and carbon black and/or silica, wherein Rand Rare the same as or different from each other and each represent a hydrogen atom or a C1-C30 hydrocarbon group.

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Kobe, Japan

Masaki Oshimo