Lactide melt recrystallization
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United States of America Patent
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Nov 23, 1993
Grant Date -
N/A
app pub date -
Sep 8, 1992
filing date -
Sep 8, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Generally, polylactic acid is prepared by the ring opening polymerization of lactide. However, to obtain a high molecular weight polylactic acid it is necessary to start with a lactide having a high degree of purity. Lactide may be economically brought to the required degree of purity using melt recrystallization techniques.
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