Lactide polymerization
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United States of America Patent
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Oct 18, 1994
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N/A
app pub date -
Sep 8, 1992
filing date -
Sep 8, 1992
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Expired
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Abstract
High molecular weight polylactic acid is generally produced by the polymerization of lactide. Lactide is prepared by the depolymerization of low molecular weight polylactic acid. There are difficulties in the preparation of high molecular weight polylactic acid and high purity lactide isomers due to the equilibrium between lactic acid, low molecular weight polylactic acid, high molecular weight polylactic acid, lactide and water. Further it has never been proposed to provide a continuous process to produce high molecular weight polylactic acid from lactic acid. The present invention overcomes the equilibrium problem and provides a continuous process.
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