| 摘要 |
High molecular weight coupled block copolymer composition comprising
(a) a linear diblock copolymer (I) represented by the general formula (A-B), having a peak apparent molecular weight of from 150,000 to 300,000,
(b) a linear di-armed block copolymer (II), represented by the general formula (A-B) 2 X,
(c) a tri-armed block copolymer (III), represented by the formula (A-B) 3 X,
(d) a more than tri-armed block copolymer (IV), represented by the formula (A-B) n>3 X,
(e) side polymeric structures (SPS) having a peak apparent molecular weight below the linear diblock copolymer (I),
wherein A represents a block of predominantly poly(monovinyl aromatic hydrocarbon) and wherein the poly(monovinyl aromatic hydrocarbon) content is in the range of from 20 to 35 wt%; wherein B represents a block of predominantly poly(conjugated diene); wherein X is the residue of a trifunctional and /or tetrafunctional coupling agent; wherein the block copolymer composition has a weigh average molecular weight M w in the range of from 450,000 to 800,000, and
wherein the relative amounts of block copolymers corresponds to: I is from 5 to 15 wt%; II and III together are from 70 to 90 wt%, wherein III is above 10 wt%; IV is below 10 wt% and SPS is less than 10 wt% respectively, relative to the weight of the total block copolymer composition, in which the respective components add up to 100 %.
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