| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester having both improved mechanical properties (e.g. rigidity) and good biodegradability, and its production process. SOLUTION: A lactide and a specified aromatic hydroxycarboxylic acid derivative represented by phenyl p-hydroxybenzoate are thermally reacted in the absence of a solvent to produce a biodegradable copolyester having a weight-average molecular weight of 1,000 to 1,000,000.
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