| 摘要 |
PROBLEM TO BE SOLVED: To obtain an asphalt composition manifesting high softening point, excellent in mechanical strengths, processability and storing stability and suitable for road paving by compounding a specific amount of a composition of a block copolymer of an alkenyl aromatic compound having a specific structure and a conjugated diene. SOLUTION: The composition consists of (A) 3-15 parts of the block copolymer composition having 0.3-15.0 of melt flow index and 80-130 deg.C of softening point, (B) 85-97 parts of asphalt, and is set that the component (A) consists of 98-20wt.% of a block copolymer (A1 ) comprising a polymer block (R1 ) mainly consisting of at least two monoalkenyl aromatic compounds and a copolymer block (R2 ) mainly consisting of the conjugated diene polymer (X), and 2-80% of a block copolymer (A2 ) comprising R1 and R2 having peak molecular weight corresponding to 1/3-2/3 of (A1 ), the difference between total amount of alkenyl aromatic compounds (Z) and R1 content is 2-30%, the contents of Z and R1 are 10-50% respectively, the amount of vinyl bond in the X is 0-50%. |
