Asahi Kasei Kabushiki Kaisha

Takayuki Shiromoto

Shigeo Nakajima

Takuya Suzuki

Yoshifumi Araki

Nobuaki Kubo

Yukari Hori

The present invention provides a polymer comprising conjugated diene monomer units and vinyl aromatic monomer units, wherein

Polymer and asphalt composition

An asphalt composition containing 0.5 parts by mass or more and 20 parts by mass or less of a block copolymer and 100 parts by mass of an asphalt; the block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit, and a copolymer block (B) containing a conjugated diene monomer unit and a vinyl aromatic monomer unit.

Asphalt composition

The polymer according to the present invention is a polymer containing a conjugated diene monomer unit and a vinyl aromatic monomer unit, wherein the polymer has a polymer block (A) containing the vinyl aromatic monomer unit as a main component and a polymer block (B) containing the conjugated diene monomer unit and the vinyl aromatic monomer unit, a content of the polymer block (A) is 10% by mass or more and 40% by mass or less, a bulk density of the polymer is 0.05 g/mL or more and 0.45 g/mL or less, and a specific surface area of the polymer is 0.10 m/g or more and 0.60 m/g or less.

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Tokyo, Japan

Takayuki Shiromoto