PROCESS AND APPARATUS FOR PRODUCING ALIPHATIC POLYESTER

  • US 20120309929A1
  • Filed: 06/05/2012
  • Published: 12/06/2012
  • Est. Priority Date: 06/06/2011
  • Status: Abandoned Application
First Claim
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1. A process for producing an aliphatic polyester, comprising the steps of:

  • heating a cyclic ester at a melting point or higher to transform the cyclic ester into molten state and convert a moisture contained in the cyclic ester into free carboxylic acid;

    measuring an amount of the free carboxylic acid in the molten cyclic ester;

    feeding a proton-source compound in an amount determined based on the measured amount of the free carboxylic acid into the molten cyclic ester; and

    subjecting the cyclic ester to ring-opening polymerization.

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