Method for surface treatment of fibrous polyphenylene sulfide or polysulfone
AssigneeCarl Freudenberg KG
InventorsRolf-Peter Schwoebel, Harald Hoffmann
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Abstract
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.
Claims5
A method of surface treatment of polyphenylene sulfide or polysulfone fibers to improve their wettability by a 30-38% by weight aqueous KOH solution, said method comprising treating the fibers with a gas mixture comprising elemental fluorine, oxygen and nitrogen as carrier gas, the proportion of elemental fluorine being from 1 to 5% by volume and the proportion of elemental oxygen being not more than 20% by volume, the gas mixture being allowed to act on the fibers until the total fluorine content-of the fibers is in the range from 0.01 to 0.2% by weight, whereby the treated fibers are wettable by said aqueous KOH solution in less than 10 seconds.
Dependencies are inferred from the claim text.