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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.
An aliphatic polyester resin which does not contain a metal component selected from the group consisting of tin, titanium, aluminum, zinc, zirconium, and antimony, and has a weight average molecular weight of 500,000 or more and an enthalpy of 15.0 J/g or less, based on cooling crystallization made when conducting DSC measurement under the following measurement conditions:
An aliphatic polyester resin composition comprising an aliphatic polyester resin which does not contain a metal component selected from the group consisting of tin, titanium, aluminum, zinc, zirconium, and antimony, and has a weight average molecular weight of 500,000 or more and an enthalpy of 15.0 J/g or less, based on cooling crystallization made when conducting DSC measurement under the following measurement conditions:
Dependencies are inferred from the claim text.