Method for stabilizing polymers containing repeating lactic acid units, and stabilized polymers so made
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United States of America Patent
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Feb 14, 2012
Grant Date -
Sep 30, 2010
app pub date -
May 12, 2008
filing date -
May 16, 2007
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Abstract
Metal catalyst residues in resins containing polymerized lactic acid units, such as polylactides, are deactivated by treatment with a polymer or copolymer that contain pendant acid groups and pendant ester groups, with an acid-containing PLA resin, or with a polymer or copolymer having at least one acid groups per 250 atomic mass units and which has pendant lactic acid or poly(lactic acid) groups. The deactivating agent is effective at deactivating the catalyst, and has little effect on the optical clarity of the resin.
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