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Abstract

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 200,000 to 300,000, (b) a linear di-armed block copolymer (II), represented by the general formula (A-B).sub.2X, (c) a tri-armed block copolymer (III), represented by the formula (A-B).sub.3X, (d) a more than tri-armed block copolymer (IV), represented by the formula (A-B).sub.n>3X, (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 weight average molecular weight M.sub.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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First Claim