Process of producing polylactic acid
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United States of America Patent
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Apr 24, 2012
Grant Date -
Mar 4, 2010
app pub date -
Feb 6, 2008
filing date -
Feb 9, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, including the steps of:
- (i) obtaining a solid by kneading together poly(L-lactic acid) and poly(D-lactic acid) at a temperature of 160 to 225° C. and crystallizing the kneaded product; and(ii) melt kneading the obtained solid.
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