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AssigneeTeijin Limited
InventorsTakaya Masuda, Masanori Miyamoto
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An object of the present disclosure is to provide a method for producing an aliphatic polyester resin which substantially does not contain impurities, such as metals, and which has high molecular weight, particularly a polylactic acid having high molecular weight and high optical purity. The method for producing an aliphatic polyester resin of the present disclosure has a step of contacting a solution containing a cyclic ester with a cyclic amine catalyst and a polymerization initiator to initiate a reaction, a step of conducting the reaction by flow-type polymerization, and a step of subjecting the product obtained in the flow-type polymerization to further reaction by postpolymerization by stirring.
A method for producing an aliphatic polyester, comprising a step of contacting a solution containing a cyclic ester with a cyclic amine catalyst and a polymerization initiator and lowering the temperature from room temperature to initiate a reaction, a step of conducting the reaction by flow-type polymerization, and a step of subjecting the product obtained in the flow-type polymerization to further reaction by postpolymerization by stirring,
Dependencies are inferred from the claim text.