IMPACT-ABSORBING MATERIAL AND SEALING MATERIAL COMPRISING SAME

摘要

An impact-absorbing material which comprises a resin composition comprising a block copolymer (A) in which a block at each end part of the block copolymer comprises a polystyrene and a block at the middle part of the block copolymer comprises a conjugated diene polymer and a thermoplastic resin (B), wherein the block copolymer (A) comprises a block copolymer (A1) in which the block at the middle part is not hydrogenated and a block copolymer (A2) in which the block at the middle part is hydrogenated, the maximum peak temperature of loss tangent (tand) of the block copolymer (A1) is equal to or higher than -20°C and lower than 25°C as measured by a dynamic viscoelasticity measurement, and the maximum peak temperature of loss tangent (tand) of the block copolymer (A2) is equal to or higher than -30°C and lower than 25°C as measured by a dynamic viscoelasticity measurement.