Patent ID: 6864351

Claim:
A lactide/lactone copolymer wherein an average continuous chain length is at least 3 in a lactide unit and an average continuous chain length is 1-10 in a lactone unit, and in which the lactide unit is composed of a random portion having the average continuous chain length of not more than 5 and a block portion having the average continuous chain length of more than 5, and a average continuous chain length 1LL(B) in the block portion is satisfied by the formula described below; 1 LL ( B ) 2 >( fL/ ( fL+fCap )) 3 ×23 wherein fL is the fraction of lactide component in the lactide/lactone copolymer, and fCap is the fraction of lactone component in the lactide/lactone copolymer.