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Preparing porous hydrogel products

  • US 6,511,650 B1
  • Filed: 04/18/2002
  • Issued: 01/28/2003
  • Est. Priority Date: 04/09/1999
  • Status: Expired due to Fees
First Claim
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1. A method for preparing a hydrogel material having macroporous open pore porosity, which comprises:

  • a) providing a solution of a hydrogel-forming material, a surfactant and, optionally, a gas-generating component, which solution is capable of being mixed in the presence of a gas to incorporate the gas in the solution and form a stable foam;

    b) forming a stable foam by mixing the solution in the presence of a gas and/or, if the gas-generating component is present, by subjecting the solution to conditions or agents which result in generation of gas from the gas-generating component;

    c) exposing the stable foam to conditions and/or agents which result in gelling of the hydrogel-forming material to form a hydrogel containing gas bubbles therein;

    d) releasing the gas bubbles from the hydrogel to form a hydrogel material having macroporous open pore porosity.

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