To provide a narrow and large-diameter tire capable of improving noise performance at high speeds without compromising handling performance at low temperatures.

The tire has a tread portion formed of an elastomer composition. A relationship between a tire outer diameter (Dt) and a tire cross-sectional width (Wt) satisfy a following expression (1). The tread portion includes at least one circumferential groove extending in a tire circumferential direction. A rubber thickness at a groove bottom of the circumferential groove is 0.05 to 0.25 times a maximum thickness of the tread portion. The elastomer composition has a phase difference δ of 5.0×10.sup.−2π [rad] or less between a maximum value of strain and a maximum value of stress when repeatedly deformed at a temperature of 30 degrees Celsius and a frequency of 10 Hz in a dynamic viscoelasticity test;

1963.4≤(Dt.sup.2×π/4)/Wt≤2827.4  (1).

A conjugated diene-based polymer including at least conjugated diene monomer units, and having a shrinkage factor of high molecular weight molecules of 0.4 to 0.8, a degree of adsorption of high molecular weight molecules onto silica of 75% or less, and a degree of adsorption of medium molecular weight molecules of 40 to 100%.

Provided are a terminally modified diene-based polymer having excellent mechanical properties, and also a method for producing the same. The terminally modified diene-based polymer is obtainable by allowing a diene-based polymer terminated with ketone or aldehyde groups to react with a heterocyclic compound that is a nitrogen-containing unsaturated five-membered ring or six-membered ring compound having a primary amine.

Disclosed is a functionalizing method for the end functionalisation of trans-1,4 stereo-regular polydiene chains obtained by the coordination catalytic polymerisation of at least one conjugated diene monomer. It also relates to a polydiene having a trans-1,4 chain formation rate of at least 85%, preferably at least 90%, and an end functionalisation rate higher than 70%, preferably higher than 80%, and more preferably higher than 90%.

This invention relates to a rubber composition containing filler reinforcement comprised of precipitated silica with silica coupling agent therefore and conjugated diene-based elastomer which contains end-chain functionalization with multi-functional groups. The groups functionalizing the elastomer are multi-functional in the sense of containing one group reactive with at least one of said precipitated silica and silica coupling agent and another different group reactive with diene-based elastomers through sulfur cure of the rubber composition. A sulfur cured rubber composition containing said end-chain functionalization is provided. A tire is provided having a component comprised of said rubber composition. Representative of said tire component is a tire tread.

The present invention provides a conjugated diene-based polymer excellent in processability in vulcanization, and excellent in abrasion resistance and a low hysteresis loss property of a vulcanizate obtained therefrom. The present invention relates to a conjugated diene-based polymer, having a branch number measured by viscosity detector-equipped GPC-light scattering measurement of 7 or more, an amount of bound aromatic vinyl of 1% by mass or more and 32% by mass or less, and a content of vinyl bond in bound conjugated diene of 11% by mol or more and 35% by mol or less.

The present invention relates to a conjugated diene-based polymer or a modified conjugated diene-based polymer, which has excellent wet skid resistance and abrasion resistance in a balanced way, and a rubber composition including the same, and by controlling the microstructure of the polymer such that a full width at half maximum (FWHM) value of a tan δ peak shown in a temperature range of -100° C. to 100° C. becomes 20° C. or higher in a tan δ graph in accordance with temperature, derived from dynamic viscoelasticity analysis by an Advanced Rheometric Expansion System (ARES), excellent viscoelasticity behavior properties may be shown, and accordingly, the improvement of overall physical properties may be expected.

The present invention relates to an oil-extended modified conjugated diene-based polymer having excellent tensile properties and abrasion resistance, a method for preparing same and a rubber composition including same, and provides an oil-extended modified conjugated diene-based polymer including a modified polymer chain including a repeating unit derived from a conjugated diene-based monomer and a functional group derived from an aminoalkoxysilane-based modifier; and a derived unit from a vegetable oil, wherein at least one of the modified polymer chain is coupled with the derived unit from vegetable oil, N and Si atoms are included in 100 ppm or more each based on a total weight of the polymer, two glass transition temperatures of Tg1 and Tg2 measured by differential scanning calorimetry (DSC) are shown, Tg1 is −80° C. to −20° C., Tg2 is −50° C. to 30° C., and Tg2 is higher than Tg1, a method for preparing same and a rubber composition including same.

A binder for an all-solid-state secondary battery, including a polymer (A) that has an aromatic vinyl unit including an aromatic vinyl compound and a conjugated diene unit including a conjugated diene compound. The binder has a Mooney viscosity (ML.sub.1+4, 100° C.) from 10 to 100 and has a value α, which is represented by the following equation (i), of less than 0.7, where “p”, “q”, “r”, and “s” represent constituent ratios (molar ratios) of a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), a structural unit represented by the following formula (3), and a structural unit represented by the following formula (4) in the polymer, respectively. α=(p+(0.5×r))/(p+q+(0.5×r)+s) • • • (i)

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The present invention relates to an oil-extended conjugated diene-based polymer or an oil-extended modified conjugated diene-based polymer, which has excellent wet skid resistance and abrasion resistance in a balanced way, and a rubber composition including the same, and by controlling the microstructure of the polymer such that a full width at half maximum (FWHM) value of a tan δ peak shown in a temperature range of -100° C. to 100° C. becomes 20° C. or higher in a tan δ graph in accordance with temperature, derived from dynamic viscoelasticity analysis by an Advanced Rheometric Expansion System (ARES), and by including a vegetable oil in a polymer, excellent viscoelasticity behavior properties may be shown, and accordingly, the improvement of overall physical properties may be expected.