Asahi Kasei Kabushiki Kaisha

Kenta Hisamura

Yoshifumi Araki

Junichi Yoshida

Tomohiro Kondo

Shinichi Sekikawa

Atsushi Yasumoto

Miki Kyo

Shogo Sumitani

Yukio Yamaura

Chigusa Yamada

Akitomo Kikuchi

Miho Yamamoto

Shuri Tobo

Syogo Sumitani

Takaaki Ushio

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

The present invention provides a conjugated diene-based polymer composition excellent in rolling resistance, grip performance on a wet road surface, and abrasion resistance when formed into a tire. Also provided is a conjugated diene-based polymer composition containing: 10 to 90 parts by mass of a conjugated diene-based polymer (A) having a glass transition temperature of −20° C. or more; and 10 to 90 parts by mass of a conjugated diene-based polymer (B) having a glass transition temperature of −25° C. or less, wherein the conjugated diene-based polymer (A) has an absolute molecular weight, measured by viscosity detector-equipped GPC-light scattering measurement, of 40×10or more and 5000×10or less, and a branch number (Bn), measured by the viscosity detector-equipped GPC-light scattering measurement, of 8 or more.

Conjugated diene-based polymer composition and tire

A production method for a branched conjugated diene-based polymer, comprising:

Production method for branched conjugated diene-based polymer, production method for rubber composition, production method for tire, branched conjugated diene-based polymer, and branched conjugated diene-based polymer composition

A conjugated diene-based polymer of the present invention has an absolute molecular weight measured by viscosity detector-equipped GPC-light scattering measurement, of 40&#xd7;10or more and 5000&#xd7;10or less, has a branching number (Bn) measured by the viscosity detector-equipped GPC-light scattering measurement, of 8 or more, and has a modification ratio of 60% by mass or more.

Conjugated diene-based polymer, branching agent, production method for conjugated diene-based polymer, extended conjugated diene-based polymer, rubber composition, 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, wherein the Mooney stress-relaxation rate measured at 110&#xb0; C. is 0.45 or less, and the modification percentage is 75% by mass or more.

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Tokyo, Japan

Kenta Hisamura