Patent ID: 6951956

Claim:
Crystalline polyglycolic acid, wherein (a) a difference (Tm−Tc 2 ) between the melting point Tm defined as a maximum point of an endothermic peak attributable to melting of a crystal detected in the course of heating at a heating rate of 10° C./min by means of a differential scanning calorimeter and the crystallization temperature Tc 2 defined as a maximum point of an exothermic peak attributable to crystallization detected in the course of cooling from a molten state at a cooling rate of 10° C./min is not lower than 35° C., and (b) a difference (Tc 1 −Tg) between the crystallization temperature Tc 1 defined as a maximum point of an exothermic peak attributable to crystallization detected in the course of heating an amorphous sheet at a heating rate of 10° C./min by means of a differential scanning calorimeter and the glass transition temperature Tg defined as a temperature at a second-order transition point on a calorimetric curve detected in said course is not lower than 40° C.