| 摘要 |
PROBLEM TO BE SOLVED: To provide a composition based on a radial polystyrene-polyisoprene block copolymer usable as a more excellent adhesive ingredient. SOLUTION: The composition comprising poly-aromatic vinyl-polyisoprene block copolymer is obtained by reacting a di-block product with a tetra- functional coupling agent in the presence of a tertiary amine polyamine(s), comprises (a) 1-34 wt.% di-block product, (b) 34-99 wt.% tetra-branched product and (c) 0-50 wt.% di- and/or tri-branched product and has a weight average molecular weight (Mw) of the whole composition of 260,000-500,000 and a content of poly-aromatic vinyl block of 5-24 wt.%. COPYRIGHT: (C)2004,JPO
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