| abstract |
Modified asphalts have excellent dispersibility and compatibility with polar materials, are usable in applications including railroad track-filling materials, and are inexpensive. n A modified asphalt includes an asphalt (A), a viscosity depressant (B) and a copolymer (C) containing a structural unit from a polyalkylene glycol allyl ether (c1), a structural unit from an unsaturated dicarboxylic acid and/or an acid anhydride thereof (c2), and a structural unit from an aromatic vinyl compound (c3). |