Block copolymer compositions comprising a tetrablock and a diblock copolymers, obtained by sequential polymerization and reinitiation

摘要

Block copolymer compositions comprising:a) a tetrablock copolymer of the formula S₁-D₁-D₂-S₂ wherein S₁ and S₂ represent the same or different polymer blocks of predominantly styrene wherein D₁ and D₂ represent different polymer blocks, derived from at least one predominantly conjugated diene,b) a diblock copolymer of the formula S₁-D₁ or S₂-D₂.and a process for their manufacture.