| 摘要 |
PROBLEM TO BE SOLVED: To produce a biologically degradable and absorbable polymer having a metal content of 1-20 ppm. SOLUTION: This flexible biologically degradable and absorbable polymer having a low metal content is synthesized by copolymerizing lactic acid lactide withε-caprolactone in the presence of a small amount of metal-based catalyst (a catalyst based on sodium, potassium, aluminum or tin). Thereby, the flexible copolymer not needing the removal of the catalyst can be synthesized.
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