| 摘要 |
Disclosed is a styrene polymer composition comprising a styrene/n-butyl acrylate copolymer (I) comprising styrene monomer units and n-butyl acrylate monomer units in a specific ratio, and a branched block copolymer (II) comprising vinyl aromatic hydrocarbon monomer units and conjugated diene monomer units in a specific ratio, wherein the branched block copolymer (II) has a block configuration comprising at least one vinyl aromatic 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 vinyl aromatic hydrocarbon/conjugated diene copolymer block, wherein the vinyl aromatic hydrocarbon polymer block of the branched block copolymer (II) exhibits, in a gel permeation chromatogram thereof, at least one peak molecular weight in each of two different specific ranges, and wherein the branched block copolymer (II) has a specific vinyl aromatic hydrocarbon block ratio.
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