| 摘要 |
A hydrogenated block copolymer which comprises at least two polymer blocks A each mainly comprising an aromatic vinyl hydrocarbon compound monomer unit and at least two hydrogenated polymer blocks B each mainly comprising a hydrogenated butadiene monomer unit, at least 90% of olefinically unsaturated double bonds in the polymer blocks mainly comprising a butadiene monomer unit before hydrogenation having been hydrogenated, wherein at least one of the block at the terminal of the hydrogenated block copolymer is the polymer block B, wherein the proportion of the terminal polymer blocks B in the hydrogenated block copolymer is at least 0.1 wt% but less than 9.1 wt%, wherein the proportion of the aromatic vinyl hydrocarbon compound in the hydrogenated block copolymer is at least 25 wt% but less than 80 wt%, and wherein the 1,2-bond content of the polymer blocks mainly comprising a butadiene monomer unit before hydrogenation is, on average, at least 60 mol% but less than 99 mol%. By the incorporation of such a hydrogenated block copolymer having a specific structure to an alloy of a polypropylene resin with a polyphenylene ether resin or a polystyrene resin, the resulting resin composition is improved in the balance among the appearance of its molded article, tensile elongation at break and moldability and, in addition, has characteristics of both the polypropylene resin and the polyphenylene ether resin or polystyrene resin in combination. |
