| abstract |
PROBLEM TO BE SOLVED: To provide a biodegradable lactic acid-based copolymer having a sufficient high molecular weight and excellent impact resistance, transparency and flexibility by controlling the segment size of various polymers. It is to provide a manufacturing method of. SOLUTION: In the present invention, lactide (A) and polyurethane (B) are transesterified with one or more ring-opening polymerization catalysts (C) and one or more carbamates, and / or Alternatively, ring-opening copolymerization and ester and / or ester amide exchange reaction are performed in the presence of an ester amide exchange catalyst (C ′). Here, the weight ratio of lactide (A) to polyurethane (B) is 50 to 99% by weight of lactide (A) and 1 to 50% by weight of polyurethane (B). |