Continuous process for manufacture of lactide polymers with controlled optical purity
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United States of America Patent
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Aug 25, 1992
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app pub date -
Jan 24, 1992
filing date -
Jan 24, 1992
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Abstract
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.
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