Patent attributes
A block copolymer mixture comprising block copolymers (A), (B) and (C) each block comprising vinyl aromatic hydrocarbon and conjugated diene monomer units:wherein block (A) comprises from 75 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 25 mass % of a conjugated diene, and which has a block portion composed mainly of a vinyl aromatic hydrocarbon having a number average molecular weight of from 30,000 to less than 150,000:block (B) comprises from 50 to 80 mass % of a vinyl aromatic hydrocarbon and from 20 to 50 mass % of a conjugated diene, and which has a block portion composed mainly of a vinyl aromatic hydrocarbon having a number average molecular weight of from 20,000 to less than 120,000, andblock (C) comprises from 60 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 40 mass % of a conjugated diene, which has at least one random copolymer block portion comprising, as monomer units, from 55 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 45 mass % of a conjugated diene.
