Method for the production of polyactide from a solution of lactic acid or one of the derivatives thereof
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United States of America Patent
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Feb 10, 2009
Grant Date -
Jan 19, 2006
app pub date -
Aug 4, 2003
filing date -
Aug 6, 2002
priority date (Note) -
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Abstract
A process for the production of polylactide, the stages of which for the production and purification of lactide, starting from an aqueous solution of lactic acid or of its derivatives, includes evaporation of water with formation of oligomers, depolymerization to give lactide, condensation and then crystallization of the crude lactide product to give purified lactide, aqueous treatment of the residual fractions from the crystallization and polymerization of purified and/or prepurified lactide to give polylactide in an extruder and in the presence of catalysts. An alternative process includes carrying out the aqueous treatment before the crystallization.
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