| 摘要 |
PROBLEM TO BE SOLVED: To stably and efficiently producing a high molecular weight, high quality aliphatic polyester-based resin free from the discoloration problem by preventing the occurrence of a scorching (a carbonized matter) and the delay of production period caused by a residual polymer in the reactor at a successive productive reaction, in a batchwise production method where raw materials for producing polyester are charged in the reactor, reacted and polymerized in the reactor to produce an aliphatic polyester-based resin and discharging the reaction product from the reactor. SOLUTION: The discharge amount of the reaction product in the discharging step is so regulated as to be 70-95 wt.% of the amount of reaction product in the reactor. COPYRIGHT: (C)2008,JPO&INPIT |
