| 摘要 |
PROBLEM TO BE SOLVED: To reduce the softening point without curing after production while retaining high rutting resistance (DS value).SOLUTION: A polymer modified asphalt composition comprises a base asphalt, 3-6 mass% of a thermoplastic elastomer obtained by mixing a first styrene-based thermoplastic elastomer having a 25% toluene solution viscosity at 25°C of 3,000-6,000 mPa s and a second styrene-based thermoplastic elastomer having a 25% toluene solution viscosity at 25°C of 500-2,500 mPa s and 0.3-2 mass% of a 20C polycyclic diterpene having carboxyl groups. The content of the first styrene-based thermoplastic elastomer in the entire thermoplastic elastomer is 60-80 mass%. |
