Polylactic acid resin and method for producing same
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United States of America Patent
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Jul 14, 2015
Grant Date -
May 22, 2014
app pub date -
Jul 18, 2012
filing date -
Jul 28, 2011
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Abstract
The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallized prepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (ΔHma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance.
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