Fibre fleece of electrostatically spun fibres and methods of making same
First Claim
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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Abstract
In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The filters obtained have substantially improved properties.
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Citations
9 Claims
- 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.
- 5. Process of producing a fleece of polymeric fibres which comprises electrostatically spraying a solution having a conductivity of -9 Ohm-1 cm-1 to 10-4 Ohm-1 cm.sup. -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, collection of the polymer as the fibre fleece on the support, the polymer being polycarbonate and the fibres of the fleece having a porous surface structure, impressing charges of opposite polarity on the electrode and the support and alternating the polarity to provide the fleece composed of layers with positive and negative charges.
Specification