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Fibre fleece of electrostatically spun fibres and methods of making same

  • US 4,143,196 A
  • Filed: 07/07/1977
  • Issued: 03/06/1979
  • Est. Priority Date: 06/29/1970
  • Status: Expired due to Term
First Claim
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1. An article comprising several layers of fibre fleeces each produced by electrostatically spraying a solution having a conductivity of 10-9 Ohm-1 cm-1 to 10-4 Ohm-1 cm-1 of a polymer in a volatile solvent between an electrode wetted by the solution and a conductive support for spraying of the solution, evaporation of the solvent, and collection of the polymer as the fibre fleece on the support, the polymer being polycarbonate and the fibers of the fleece having a porous surface structure, said layers, respectively, having positive and negative charges.

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