Method for producing polylactic acid
AssigneeShimadzu Corporation
InventorsHitomi Ohara, Seiji Sawa, Masahiro Ito, Yasuhiro Fujii, Masaaki Oota, Hideshi Yamaguchi
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Abstract
A method for producing a polylactic acid, comprising the steps of carrying out a ring-opening polymerization of lactide to give polylactic acid, adding a compound capable of inactivating a catalyst for ring-opening polymerization of the lactide at the completion of the reaction, and removing unchanged lactide from the polylactic acid product by reducing pressure and/or allowing an inert gas to pass; and a method for forming fiber or film directly from the polylactic acid produced by the invention.
Claims18
A method for producing a polylactic acid, comprising the steps of:
- carrying out a ring-opening polymerization of lactide in the presence of a catalyst for ring-opening polymerization of the lactide to give polylactic acid;
- adding a compound capable of inactivating the catalyst to the resulting reaction mixture;
- and
- reducing pressure in a reactor containing the reaction mixture and/or allowing an inert gas to pass through the reactor to remove unchanged lactide from the polylactic acid.
Dependencies are inferred from the claim text.