Patent ID: 7393898
Filing Date: 2008-07-01
Classification: C08F,C08G,C08L

Abstract:
1. A block copolymer composition which is a block copolymer composition comprising, as monomer units, from 55 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 45 mass % of a conjugated diene, which composition contains the following components A and B in a blend ratio within a range of component A/component B=20 to 80/80 to 20 (mass ratio): Component A is a block copolymer (1) which comprises, as monomer units, from 55 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 45 mass % of a conjugated diene, (2) which is constituted by a hard segment block made mainly of the vinyl aromatic hydrocarbon and a soft segment block made mainly of the conjugated diene, (3) wherein the hard segment block comprises blocks S (4) which is produced by a coupling reaction; and component B is a block copolymer (1) which comprises, as monomer units, from 55 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 45 mass % of a conjugated diene, (2) which is constituted by a hard segment block made mainly of the vinyl aromatic hydrocarbon and a soft segment block made mainly of the conjugated diene, (3) wherein the hard segment block comprises blocks S (4) which is produced by a coupling reaction.