| 摘要 |
PROBLEM TO BE SOLVED: To provide a vinyl aromatic compound-conjugated diene block copolymer rubber capable of improving appearance of a vinyl aromatic compound-based resin, and excellent in bale formability, bale operability, bale friability and bale solubility.SOLUTION: There is provided a vinyl aromatic compound-conjugated diene block copolymer rubber containing a vinyl aromatic compound unit and a conjugated diene unit, and (a) the content of the vinyl aromatic compound unit is 28 to 45 mass%, (b) a peak top molecular weight of 100,000 to 500,000, (c) it has at least one vinyl aromatic compound block, (d) an apparent density with a bale shape (weight of bale/volume of bale) is 0.6 to 0.85 and (e) a bend elastic constant with the bale shape at 10°C is 5 to 20 kgf/cm. |
