To obtain a flowability enhancer enabling to afford flowability to a resin or a resin composition such as an engineering plastic of poor flowability without affecting their physical properties.
This aliphatic copolyester-based flowability enhancer having weight average molecular weight of ≥40,000 has a structure in which a low molecular weight aliphatic copolyester (D) having weight average molecular weight of ≥5,000 and composed of a repeating unit (P) expressed by -CO-R1- COO-R2-Oand a repeating unit (Q) expressed by -CO-R3-O- are linked by 0.1 to 5 pts.wt. of a bifunctional linker (E) based on 100 pts.wt. of (D). MFR of a resin or a resin composition (H) having 1.0 MFR is enhanced by 30% by blending 10 to 50 pts.wt. of the aliphatic coplyester-based flowability enhancer with 100 pts.wt. of (H).
OOMAE HITOMI
KAKUMOTO SATOSHI
