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Selectively permeable barriers

  • US 5,147,553 A
  • Filed: 03/29/1991
  • Issued: 09/15/1992
  • Est. Priority Date: 05/04/1988
  • Status: Expired due to Fees
First Claim
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1. A process for forming a microporous membrane which process comprises contacting a solution comprising one or more polymers in a first liquid, said solution being in the form of a tube or sheet, with a second liquid which second liquid is a substantial solvent for at least part of said first liquid and substantially a non-solvent for at least one of said polymers, said second liquid comprising a suspension or emulsion comprising as the disperse phase particles of one or more carbon compounds which are solids at room temperature and substantially insoluble in said second liquid.

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