Asahi Kasei Chemicals Corporation

Asahi Kasei Kabushiki Kaisha

Japan Elastomer Co., Ltd.

Kazuo Moritou

Takahiro Hisasue

Katsumi Suzuki

Toshinori Shiraki

Shigeru Sasaki

Shigeki Takayama

Masahiro Sasagawa

Yoshifumi Araki

Kenta Shibuya

Kosuke Nakatani

Disclosure provides a block copolymer composition having 20% by mass or more and 90% by mass or less of a component (A) and 10% by mass or more and 80% by mass or less of a component (B), wherein the component (A) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 30,000 or higher and 190,000 or lower; and the component (B) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 60,000 or higher and 500,000 or lower.

Block copolymer and adhesive composition

A hydrogenated copolymer obtained by hydrogenating an unhydrogenated copolymer comprising conjugated diene monomer units and vinyl aromatic monomer units, the hydrogenated copolymer containing at least one hydrogenated copolymer block (B) which is obtained by hydrogenating an unhydrogenated random copolymer block comprised of conjugated diene monomer units and vinyl aromatic monomer units, wherein the hydrogenated copolymer has the following characteristics: the hydrogenated copolymer has a content of the vinyl aromatic monomer units of from more than 40% by weight to less than 95% by weight; at least one peak of loss tangent (tan &#x3b4;) is observed at &#x2212;10 to 80&#xb0; C. in a dynamic viscoelastic spectrum obtained with respect to the hydrogenated copolymer; and substantially no crystallization peak ascribed to the copolymer block (B) is observed at &#x2212;20 to 80&#xb0; C. in a differential scanning calorimetry (DSC) chart obtained with respect to the hydrogenated copolymer.

Hydrogenated copolymer and composition containing the same

Hydrogenated copolymer and composition thereof

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Kawasaki, Japan

Kazuo Moritou