Asahi Kasei Kabushiki Kaisha

Bridgestone Corporation

Miki Kyo

Shinichi Sekikawa

Kenta Hisamura

Hiromi Nakafutami

Shogo Sumitani

Shuri Tobo

A conjugated diene-based polymer of the present invention has a branch number (Bn) measured by viscosity detector-equipped GPC-light scattering measurement of 8 or more, has a change (ΔT) of an oxidation onset temperature caused through application of a thermal load of 11.9° C. or less, and contains an aromatic vinyl compound monomer unit.

Conjugated diene-based polymer, branching agent, production method for conjugated diene-based polymer, oil extended conjugated diene-based polymer, rubber composition, and tire

A modified conjugated diene-based polymer, including a coupling polymer,

Modified conjugated diene-based polymer, rubber composition, and tire

A modified conjugated diene-based polymer containing:

Modified conjugated diene-based polymer and rubber composition thereof, and tire

A modified conjugated diene-based polymer having a nitrogen atom, wherein

Modified conjugated diene-based polymer, production method thereof, rubber composition and tire

The present invention provides a modified conjugated diene-based polymer having a weight-average molecular weight of 20&#xd7;10or more and 300&#xd7;10or less, in which the modified conjugated diene-based polymer having a molecular weight of 200&#xd7;10or more and 500&#xd7;10or less is comprised in an amount of 0.25% by mass or more and 30% by mass or less based on a total amount of the modified conjugated diene-based polymer, and a shrinking factor (g') is less than 0.64.

Modified conjugated diene-based polymer and production method therefor, rubber composition and tire

In a modified conjugated diene-based polymer, a ratio of a coupling polymer, obtained by gel permeation chromatography (GPC), is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and a modification ratio obtained by adsorption GPC is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and when Mooney viscosity ML(100&#xb0; C.) measured at 100&#xb0; C. is represented by ML and a weight average molecular weight obtained by GPC is represented by Mw, ML&#x2264;1.8 (Mw&#xd7;10)&#x2212;31.5, and Mooney viscosity ML(100&#xb0; C.) measured at 100&#xb0; C. is 30 to 150.

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Tokyo, Japan

Miki Kyo