Method for producing polylactic acid
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United States of America Patent
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Apr 16, 1996
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N/A
app pub date -
Jan 20, 1995
filing date -
Jan 21, 1994
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Abstract
A method for producing a polylactic acid of the present invention includes the steps of (a) polymerizing a lactide used as a main starting material in a molten state to give a polylactic acid; and (b) further polymerizing the polylactic acid obtained in step (a) in a solid phase by heating at a temperature lower than a melting point of a final polymer product.
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