06326458 is referenced by 183 patents and cites 94 patents.

A process for the continuous production of substantially purified lactide and lactide polymers from lactic acid or an ester of lactic acid including the steps of forming crude polylactic acid, preferably in the presence of a catalyst means in the case of the ester of lactic acid, to form a condensation reaction by-product and polylactic acid, and depolymerizing the polylactic acid in a lactide reactor to form crude lactide, followed by subsequent purification of the crude lactide in a distillation system. A purified lactide is then polymerized to form lactide polymers.

Title
Continuous process for the manufacture of lactide and lactide polymers
Application Number
8/133445
Publication Number
6326458 (B1)
Application Date
October 7, 1993
Publication Date
December 4, 2001
Inventor
Ronald Leo Borchardt
Eden Prairie
MN, US
Richard Douglas Benson
Long Lake
MN, US
Matthew Lee Iwen
Richfield
MN, US
Jeffrey John Kolstad
Wayzata
MN, US
Eric Stanley Hall
Crystal
MN, US
Patrick Richard Gruber
St. Paul
MN, US
Agent
Merchant Gould Smith Edell Welter & Schmidt P A
US
Assignee
Cargill
MN, US
IPC
C08G 63/08
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