| 摘要 |
PROBLEM TO BE SOLVED: To prevent the progress of a local reaction to cause thermal deterioration of a polymer by the heat of reaction due to variations in catalyst and/or polymerization initiator concentration in the ring-opening polymerization of a cyclic dimer of anα-hydroxy carboxylic acid. SOLUTION: The polymerization method comprises preparing a first mixture by allowing a small amount of a cyclic dimer of anα-hydroxy carboxylic acid to branch off therefrom to mix it with a polymerization catalyst prior to the polymerization of the cyclic dimer of anα-hydroxy carboxylic acid, mixing the first mixture with the major amount of the cyclic dimer led to a polymerization tank, initiating the polymerization of the cyclic dimer in the presence of a polymerization initiator to perform polymerization. Further a polymerization apparatus therefor is provided. COPYRIGHT: (C)2005,JPO&NCIPI
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