Methods for producing lactide with recycle of meso-lactide

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United States of America Patent

PATENT NO 8674056
APP PUB NO 20110306749A1
SERIAL NO

13203211

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Abstract

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An S,S- and R,R-lactide stream suitable for polymerization is prepared by producing a low molecular weight poly(lactic acid), depolymerizing the low molecular weight poly(lactic acid) to form a mixture of S,S-, R,R- and meso-lactide, and separating meso-lactide from this mixture to form an S,S- and R,R-lactide stream. Meso-lactide is recycled into the process, and shifts the mole fractions of the lactides in the lactide mixture that is produced.

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Patent Owner(s)

  • NATUREWORKS LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Benson, Richard Douglas Long Lake, US 8 299

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