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Asphalt composition containing hydrogenated conjugated diene copolymer

  • US 20050107521A1
  • Filed: 10/20/2004
  • Published: 05/19/2005
  • Est. Priority Date: 10/21/2003
  • Status: Abandoned Application
First Claim
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1. An asphalt composition comprising from 0.5 to 50 parts by weight of a hydrogenated conjugated diene copolymer (a) and 100 parts by weight of asphalt (b), wherein the hydrogenated conjugated diene copolymer (a) comprises a polymer block (A) comprising vinyl aromatic monomer units and at least one hydrogenated copolymer block (B) obtained by hydrogenation of a non-hydrogenated random copolymer block comprising conjugated diene monomer units and vinyl aromatic monomer units, the hydrogenated conjugated diene copolymer (a) having the following characteristics (1) to (5):

  • (1) the content of the vinyl aromatic monomer units is more than 30% and not more than 60% by weight per weight of the hydrogenated conjugated diene copolymer;

    (2) the content of the polymer block (A) is from 5% to 50% by weight per weight of the hydrogenated copolymer;

    (3) the weight average molecular weight is from 30,000 to 500,000;

    (4) the percentage of hydrogenation of the double bonds in the conjugated diene monomer units is from 60% to 100%; and

    (5) at least one peak of the loss tangent (tan δ

    ) is present in the range of from −

    40°

    C. to less than −

    10°

    C. in a dynamic viscoelastic spectrum obtained with respect to the hydrogenated copolymer.

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