| 摘要 |
<p>A resin modifier comprising as an active ingredient an aromatic vinyl/conjugated diene block copolymer rubber which comprises 50 to 75 wt.% conjugated diene monomer units and 25 to 50 wt.% aromatic vinyl monomer units and has a number-average molecular weight of 280,000 to 1,000,000, and in which the content of vinyl bonds in the conjugated diene monomer units is 50 wt.% or higher and the proportion of aromatic vinyl monomer units incorporated in aromatic vinyl blocks to all the aromatic vinyl monomer units is 70% or higher. A molding material obtained by modifying an aromatic vinyl resin with the resin modifier gives impact-resistant aromatic vinyl resin moldings which are excellent in impact resistance, gloss, and thermal stability of gloss and are reduced in unevenness of gloss in each molding.</p> |
