| abstract |
(57) [Abstract] [Problem] It has excellent solubility in straight asphalt, Further, the present invention provides an asphalt composition which is excellent in storage stability at high temperature, and has a good balance of elongation, toughness, tenacity and softening point. SOLUTION: (A) a block copolymer represented by A 1 -BA 2 ; (B) a general formula (II); The block copolymer represented by (A 1 -B A 2 ) nX has a (a) / (b) component weight ratio of 40 to 100/60. ０0 and a weight average molecular weight of 100, An asphalt modifying block copolymer (composition) having a molecular weight of 000 to 300,000, and an asphalt composition obtained by adding the same to straight asphalt. |