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Biodegradable polyester polymer and method for preparing the same using compressed gas

  • US 6,913,826 B2
  • Filed: 10/08/2003
  • Issued: 07/05/2005
  • Est. Priority Date: 10/08/2002
  • Status: Expired due to Fees
First Claim
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1. A method for preparing polyester polymer in a particle form comprising:

  • adding one or more cyclic monomer in a high pressure reactor;

    adding an organic metal catalyst or acid catalyst and an initiator; and

    pressurizing and injecting a compressed gas solvent selected from the group consisting of HFC-23, HFC-32, HFC-152a, HFC-143a, HFC-134a, HFC-125, HFC-227ea, HFC-236fa, HFC-245fa, HFC-254cb, SF6, HFC-4-10-mee, C-318 (perfluoro cyclobutane), HCFC-22, HCFC-141b, HCFC-142b, HCFC-225ca/cb, dimethylether, N2O, propane, butane and their mixtures, or their mixtures with CO2, to solution-polymerize the monomer.

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