Patent ID: 6280880
Filing Date: 2001-08-28
Classification: D04H,D06M,H01M,Y02E,Y02P

Abstract:
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.