| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject compound, such as a high mol.wt. polylactone, excellent in color tone and stability, and useful for compost bags and the like in the presence of a small amount of a catalyst in a short time by subjecting a cyclic ester monomer to a ring-opening polymerization reaction in the presence of a specific catalyst system. SOLUTION: This method for producing an aliphatic polyester comprises subjecting (C) a cyclic ester monomer such as a lactone (e.g.ε-caprolactone) to a ring-opening polymerization reaction in the presence of a catalyst system comprising (A) a tin compound such as an alkyl tin compound having three or more less 1-24C alkyl groups (e.g. monobutyltin hydroxide oxide) and (B) an electron-donating compound such as an amide (e.g. N, N-dimethylacetamide). The aliphatic polyester is useful for fishing lines, golf tees, moldings, hot-melt adhesives and the like which utilize the biodegradability of the polyester. The component A is preferably used in an amount of 0.001-0.1 wt.% based on the total amount of the raw materials including the component C, and the component B is also preferably used in an amount of 0. 0003-1000 moles per mole of the component A.
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