BLEND POLYMER COMPOSITION INCLUDING COMPATIBILIZER

PROBLEM TO BE SOLVED: To provide a blend polymer composition that has excellent impact resistance by virtue of the addition of a compatibilizer improving the compatibility among different constituent polymers.SOLUTION: The blend polymer composition includes components (A), (B) and (C) as given below: component (A) is a styrene-based polymer; component (B) is a non-styrene-based polymer; and component (C) is a compatibilizer including a block copolymer that includes a block (1) and a block (2) as given below and that has an epoxy equivalent of 1,000 to 20,000 g/eq and a molecular weight distribution index of 1.0 to 2.0 (hereinafter it may be referred to simply as the block copolymer) (hereinafter it may be referred to simply as the compatibilizer). The block (1) is a first block including a first monomer unit having an epoxy group and a second monomer unit selected from the group consisting of an acrylate-based monomer unit, a methacrylate-based monomer unit and a combination thereof; and the block (2) is a second block including a styrene-based monomer unit.