The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 2019
Filed:
Nov. 25, 2016
Applicant:
Toyo Seikan Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
TOYO SEIKAN CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 319/12 (2006.01); C08J 11/16 (2006.01);
U.S. Cl.
CPC ...
C07D 319/12 (2013.01); C08J 11/16 (2013.01); Y02W 30/705 (2015.05);
Abstract
A method of recovering lactide which includes throwing a polylactic acid and a depolymerization catalyst into an extruder () communicated with a vent chamber () maintained under a reduced pressure, melt-kneading the polylactic acid and the depolymerization catalyst together in the extruder (), feeding the melt-kneaded product thereof into the vent chamber (), depolymerizing the polylactic acid in the vent chamber (), gasifying the formed lactide and recovering the gasified lactide from the vent chamber ().