| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a block copolymer composition for vibration damping material capable of providing a vibration damping material showing excellent vibration damping property stably over a wide temperature range.SOLUTION: There is provided the block copolymer composition for vibration damping material which contains a block copolymer A represented by the following formula (A) and a block copolymer B represented by the following formula (B), and in which ratio of an aromatic vinyl monomer unit to the whole polymer component of the block copolymer composition is 13 to 80 wt.% and weight ratio of the block copolymer A to the block copolymer B (A/B) is 5/95 to 95/5. Ar1-D-Ar2(A) Ar-D(B), where Ar1and Arare each aromatic vinyl copolymer block having a weight average molecular weight of 6000 to 20000, Ar2is an aromatic vinyl polymer block having a weight average molecular weight of 22000 to 400000 and Dand Dare each a conjugated diene polymer block.</p> |
