Patent ID: 7160952

Claim:
A linear block copolymer comprising: a structure represented by the following Chemical Formula 1: A 1 -B 1 -(B/A)-A 2 -A 3 , wherein A 1 , A 2 , and A 3 are each independently a vinyl aromatic hydrocarbon block, having a weight average molecular weight of 100 to 100,000; B 1 is a conjugated diene monomer block, having a weight average molecular weight of 100 to 100,000; and (B/A) is a conjugated diene monomer/vinyl aromatic hydrocarbon copolymer block, having a weight average molecular weight of 100 to 100,000; wherein a weight ratio of the vinyl aromatic hydrocarbon/conjugated diene monomer in the linear block copolymer is 25:75 to 50:50.