Block copolymer composition

A block copolymer composition contains a block copolymer (A) and a compound (B). The block copolymer (A) includes at least one vinyl aromatic polymer block and at least one conjugated diene polymer block. The compound (B) is at least one or the combination selected from the group consisting of phosphate represented by formula (1) and its derivatives, phosphite represented by formula (2) and its derivatives, and fatty acid having 6-9 C and terminal thereof is alkyl group with quaternary carbon and its derivatives. In formula (1) and (2), R1, R2, R3 and R4 independently represent alkyl with 4-10 C or phenyl. The transparency of a block copolymer composition can be maintained, and the smoke and the foul smell are avoided in extrusion. 本发明提供种嵌段共聚物组成物，包括嵌段共聚物(A)与化合物(B)。嵌段共聚物(A)包括至少乙烯基芳香族聚合物嵌段以及至少共轭二烯系聚合物嵌段。化合物(B)则是至少选自包括式(1)所示的磷酸酯及其衍生物、式(2)所示的亚磷酸酯及其衍生物、具有碳数6到9且末端为4级碳的烷基的脂肪酸及其衍生物，或其组合，式(1)与式(2)中，R、R、R与R各自独立为碳数4到10的烷基或苯基。从而能维持嵌段共聚物组成物的透明度，并于押出时不会产生发烟现象以及臭味。