Process for production of poly(lactic acid)-type resin, and poly(lactic acid)-type prepolymer
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United States of America Patent
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May 5, 2015
Grant Date -
Aug 1, 2013
app pub date -
Jun 27, 2011
filing date -
Sep 28, 2010
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Abstract
A method of producing a poly(lactic acid) resin includes carrying out direct polycondensation using lactic acid as a main raw material to prepare a crystallized prepolymer having a weight average molecular weight of 5,000 to 25,000, an enthalpy of fusion ΔHm of 50 to 65 J/g and an acid value A mol/ton satisfying (1) below:
(wherein Mw represents weight average molecular weight of the crystallized prepolymer); and subjecting the crystallized prepolymer to solid-phase polymerization.
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