| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aliphatic polyester having controlled thermal decomposition property, hydrolyzability and biodegradability without varying various other physical properties. SOLUTION: An aliphatic polyester is produced by the ring-opening polymerization of a lactone (e.g.ε-caprolactone) or a lactide (e.g. lactic acid) using a high-boiling monoalcohol (e.g. hexanol) or a metal alkoxide (e.g. an aluminum alkoxide) as an initiator to decrease the contents of alcohol terminal and carboxylic acid terminal to <=50% and <=30%, respectively. The contents of alcohol terminal and carboxylic acid terminal can be further decreased by bonding the terminals of the obtained polymer with a diisocyanate, etc.
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