05142023 is referenced by 214 patents and cites 33 patents.

A process for the continuous production of polylactide polymers from lactic acid which incorporates removal of water or a solvent carrier to concentrate the lactic acid feed followed by polymerization to a low-molecular-weight prepolymer. This prepolymer is fed to a reactor in which a catalyst is added to facilitate generation of lactide, the depolymerization product of polylactic acid. The lactide generated is continuously fed to a distillation system as a liquid or vapor wherein water and other impurities are removed. The resultant purified liquid lactide is fed directly to a polymerization process.

Title
Continuous process for manufacture of lactide polymers with controlled optical purity
Application Number
7/825059
Publication Number
5142023
Application Date
January 24, 1992
Publication Date
August 25, 1992
Inventor
Ronald L Borchardt
Eden Prairie
MN, US
Richard D Benson
Maple Plain
MN, US
Matthew L Iwen
Minneapolis
MN, US
Jeffrey J Kolstad
Wayazata
MN, US
Eric S Hall
Crystal
MN, US
Patrick R Gruber
St. Paul
MN, US
Agent
Merchant Gould Smith Edell Welter & Schmidt
Assignee
Cargill Incorporated
MN, US
IPC
C07D 319/12
C08G 63/08
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