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Supercritical fluid-aided treatment of porous materials

  • US 4,992,308 A
  • Filed: 09/16/1988
  • Issued: 02/12/1991
  • Est. Priority Date: 09/16/1988
  • Status: Expired
First Claim
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1. A process of making a porous material having enhanced properties, which comprises:

  • contacting porous material with a first supercritical solvent under conditions sufficient to extract extractives from said material;

    separating supercritical solvent containing extractives from the porous material having less extractives;

    contacting the porous material having less extractives with a second supercritical solvent containing a polymerizable monomer under conditions sufficient to impregnate the monomer into the porous material having less extractives;

    precipitating the polymerizable monomer within the porous material having less extractives; and

    polymerizing said precipitated polymerizable monomer in situ within the porous material having less extractives, thereby making a porous material having enhanced properties.

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