| 摘要 |
<p>A styrene polymer composition which comprises (I) a styrene/n-butyl acrylate copolymer having styrene monomer units and n-butyl acrylate monomer units in a specific proportion and (II) a branched block copolymer which comprises vinylaromatic hydrocarbon monomer units and conjugated diene monomer units in a specific proportion and has a block structure comprising at least one vinylaromatic hydrocarbon polymer block and at least one polymer block selected from the group consisting of at least one conjugated diene polymer block and at least one vinylaromatic hydrocarbon/conjugated diene copolymer block. In the branched copolymer (II), the at least one vinylaromatic hydrocarbon polymer block has at least one molecular-weight peak in each of two different specific ranges, and the vinylaromatic hydrocarbon monomer units have a specific block proportion.</p> |
