Poly(lactic acid) stereocomplex
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United States of America Patent
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Sep 14, 2010
Grant Date -
Aug 28, 2008
app pub date -
Feb 22, 2008
filing date -
Feb 27, 2007
priority date (Note) -
Expired
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Abstract
Poly(lactic acid) blends having a relatively high heat distortion temperature can be prepared by simple blending of PLA polymers of opposite stereoforms, followed by processing, e.g. by injection molding, under specific conditions of temperature and pressure, so as to produce a blend which, on differential scanning calorimetry, exhibits two peaks within the melting range of the stereocomplex. Moreover, by careful selection of these conditions of temperature and pressure, it is possible to use PLA polymers of significantly higher molecular weights than previously thought possible.
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