| 摘要 |
PROBLEM TO BE SOLVED: To provide a block copolymer blend excellent in balance of transparency against impact resistance that comprises a branched block copolymer especially less prone to produce anisotropy in a product injection-molded under high shear and superior in impact resistance. SOLUTION: This block copolymer blend comprising the branched block copolymer comprises 3 types of a polymer block of a different molecular weight containing a vinyl aromatic hydrocarbon and a conjugated diene as a monomer unit, wherein the blend of the polymer block has a molecular weight distribution in a specified range and when each peak top molecular weight of the blend of the 3 types of the polymer block is M1, M2 and M3 in a gel permeation chromatography, M1/M3 and M2/M3 are each in a specific range. COPYRIGHT: (C)2005,JPO&NCIPI
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