METHOD FOR PRODUCING POLYLACTIC ACID
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United States of America Patent
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Issued Date -
Dec 22, 2011
app pub date -
Jan 29, 2010
filing date -
Jan 30, 2009
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Abandoned
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Abstract
Provided is a method for producing polylactic acid comprising the step of a ring-opening polymerization of lactide in the presence of an alkylaluminum compound represented by the following formula (1): Formula (1)may be the same or different and independently represents a linear or branched alkyl group having 1 to 10 carbon atoms; X may be the same or different and independently represents a halogen atom or a hydrogen atom; and Al represents an aluminum atom) as a ring-opening polymerization catalyst.The ring-opening polymerization of lactide further effectively proceeds in the presence of at least one kind of metal compounds selected from the group consisting of aluminum compounds (except the alkylaluminum compounds represented by the above formula (1)), zinc compounds, titanium compounds, zirconium compounds, magnesium compounds, and calcium compounds.
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