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Process for making porous molded bodies of thermoplastic polymers

  • US 6,669,881 B2
  • Filed: 08/13/2002
  • Issued: 12/30/2003
  • Est. Priority Date: 01/11/1997
  • Status: Expired due to Term
First Claim
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1. A process for making a molded body from thermoplastic polymers, comprising the steps of:

  • (a) mixing a pulverulent polymer and a liquid to provide a mixture, wherein the pulverulent polymer has a mean particle size of 2 to 300 microns;

    (b) introducing the mixture into a molding apparatus;

    (c) sintering the mixture in said molding apparatus at a temperature and for a time period such that complete melting and fusion of the polymer is avoided;

    (d) optionally cooling the sintered mixture; and

    , (e) separating the liquid from the sintered mixture, wherein the liquid has a boiling temperature at least as high as the sintering temperature and wherein the polymer is substantially insoluble in the liquid during said mixing and sintering steps.

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