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Filter made of electrostatically spun fibres

  • US 4,069,026 A
  • Filed: 11/15/1973
  • Issued: 01/17/1978
  • Est. Priority Date: 06/29/1970
  • Status: Expired due to Term
First Claim
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1. A fibre filter comprising a fibre fleece having an electrical charge produced by electrostatically spraying a solution of a polymer in a volatile solvent having a conductivity of 10-9 Ohm-1 cm-1 to 10-4 Ohm-1 cm-1 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 fibres of the fibre fleece having a porous surface structure, and a gas permeable support combined with the fibre fleece as support therefor.

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