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:
Sep. 21, 1993
Filed:
Aug. 24, 1992
Applicant:
Inventors:
Patrick R Gruber, St. Paul, MN (US);
Eric S Hall, Crystal, MN (US);
Jeffrey J Kolstad, Wayzata, MN (US);
Matthew L Iwen, Minneapolis, MN (US);
Richard D Benson, Long Lake, MN (US);
Ronald L Borchardt, Eden Prairie, MN (US);
Assignee:
Cargill, Incorporated, Minneapolis, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C07D / ;
U.S. Cl.
CPC ...
528354 ; 525415 ; 526 68 ; 528357 ; 549274 ;
Abstract
A process for the continuous production of substantially purified lactide and lactide polymers from an ester of lactic acid including the steps of forming crude lactide in the presence of a catalyst means to form a condensation reaction by-product and polylactic acid and depolymerizing the polylactic acid molecules followed by subsequent purification of the crude lactide in a distillation system. A purified lactide is then polymerized.