PURPOSE:To provide a polyester-polyester block copolymer composition having high melt viscosity, not decreasing in its melt viscosity during residence in a molten state, being stably molded and excelling in impact strength. CONSTITUTION:A polyester-polyester block copolymer composition comprising 100 pts.wt. polyester-polyester block copolymer having a crystalline aromatic polyester as a hard segment and a polylactone as a soft segment, 0.01-10 pts.wt. at least monofunctional epoxy compound and 0.01-1 pt.wt. phosphite compound.
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