Carl Freudenberg Kg

Rolf-Peter Schwoebel

Peter Kritzer

Harald Hoffmann

Guenter Frey

Michael Appelgruen

Raoul Farer

An ultrathin, porous, and mechanically stable nonwoven fabric, a method for manufacturing the fabric, and the fabric's use are described. A nonwoven fabric is described having a thickness of less than 30 &#x3bc;m, which is chemically and/or thermally bonded, whose maximum tensile load in at least one direction is at least 15 N/5 cm, whose stretching in this direction at maximum tensile load is 35% at the most, and which has a porosity of at least 25%. This nonwoven fabric may be used as a separator material or as a carrier material for diaphragms.

Ultrathin, porous and mechanically stable nonwoven fabric and method for manufacturing

A method for surface treatment of a fibrous polyphenylene sulfide or polysulfone is based on the use of a gas mixture of 1 to 5% in volume of elemental fluorine, of nitrogen as carrier gas and of no more than 20% in volume elemental oxygen. The gas mixture affects the fibers until the total fluorine content in the fiber material is between 0.01 and 0.2 percent in weight. The fibers treated in this manner are particularly suited as separator material in electrochemical energy storage devices with an alkaline electrolyte.

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Waldmichelbach, Germany

Rolf-Peter Schwoebel