Continuous process for the manufacture of lactide and lactide polymers
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United States of America Patent
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Dec 4, 2001
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app pub date -
Oct 7, 1993
filing date -
Jan 24, 1992
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Abstract
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.
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