Method for recovering lactide from polylactic acid or derivative thereof
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United States of America Patent
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Jul 7, 2009
Grant Date -
Jan 3, 2008
app pub date -
Apr 25, 2005
filing date -
Apr 30, 2004
priority date (Note) -
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Abstract
To provide an efficient method for recovering and producing lactide having high optical purity by depolymerizing a polylactic acid or derivative thereof in order to carry out chemical recycling of the polylactic acid or derivative thereof or of a resin composition comprising same, wherein a mixture of a polylactic acid or derivative thereof and aluminum hydroxide is thermally decomposed at a temperature in a range from at least the melting temperature of the polylactic acid or derivative thereof to no greater than 320° C., thus recovering lactide.
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