Abstract: The present invention provides a resin composition comprising poly(L-lactic acid), a crystallization accelerator, a flexibility-imparting agent, and a compatibilizing agent.

Abstract: The object of the present invention is to provide a biodegradable bio-absorbable material for clinical practice having excellent degradation profiles, heat resistance and a mechanical property. The present invention provides a biodegradable bio-absorbable material for clinical practice, which comprises the following A-type polymer and B-type polymer: wherein X1 and X2 are in the range of 0 to 50 mole %, Y1 and Y2 are in the range of 0 to 50 mole %, Z1 and Z2 are in the range of 50 to 100 mole %, m1 and m2 are in the range of 3 to 8, R1 and R3 are the hydrogen or C1-4 alkyl group, R1? and R3? are the C1-2 alkyl group, and R2, R2?, R4 and R4? are the C1-4 alkyl group provided that Y1 is 0 mole % when X1 is 0 mole %, Y2 is 0 mole % when X2 is 0 mole %, and X1 and X2 are not 0 mole % at the same time.

Abstract: Bio-absorbable polymers such as vascular stent and suture thread for use as materials for clinical practice have almost definite dynamic properties such as tensile strength and degradation rate for absorption. When the dynamic properties thereof are elevated, therefore, the bio-absorbable polymers turn fragile, involving slower degradation rate. When the degradation rate is elevated, further, the dynamic properties are deteriorated. Disadvantageously, such bio-absorbable polymers have limited purposes for use and limited sites for use. Thus, copolymerization of bio-absorbable polymers with a cyclic depsipeptide to form a copolymer of the ring-opened and copolymerized depsipeptide can allow the adjustment of the dynamic properties and degradation rate of the resulting copolymer depending on the content of the depsipeptide.