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Polymer and asphalt composition

  • US 10,138,319 B2
  • Filed: 01/16/2015
  • Issued: 11/27/2018
  • Est. Priority Date: 01/17/2014
  • Status: Active Grant
First Claim
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1. A polymer comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit,wherein the polymer has a polymer block (A) comprising the vinyl aromatic monomer unit as a main component and a polymer block (B) comprising 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, anda specific surface area of the polymer is 0.10 m2/g or more and 0.60 m2/g or less,in the polymer block (B), a content of a short-chain vinyl aromatic monomer-polymerized moiety comprising 2 to 6 vinyl aromatic monomer units is 50% by mass or more based on the content of the vinyl aromatic monomer unit being 100% by mass.

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