| abstract |
PROBLEM TO BE SOLVED: To provide an asphalt composition exhibiting physical properties such as high softening point, elongation, and mechanical strength, and also having excellent storage stability, and this asphalt composition. Therefore, the present invention provides a block copolymer composition as an asphalt modifier having excellent solubility in asphalt and excellent subsequent processability. A block copolymer (A) comprising a monoalkenyl aromatic compound polymer block and a co-projected diene polymer block, and a copolymer of a monoalkenyl aromatic compound polymer block and a conjugated diene polymer block. The molecular weight is 1/3 to 2 / of the molecular weight of the block copolymer (A). 3. A block copolymer composition for asphalt modification comprising a block copolymer composition comprising the block copolymer (B) corresponding to No. 3, and an asphalt composition comprising the block copolymer composition and asphalt. |