Abstract: A novel biconstituent filament, such as multifilament or monofilament yarn or staple fiber, useful for dissipating static electricity from normally static prone textile articles comprising a first constituent substantially adhered lengthwise to a second constituent is provided. The first constituent is made of a synthetic thermoplastic fiber-forming polymer that is virtually non-conductive to electricity. The second constituent is a normally non-conductive synthetic thermoplastic fiber-forming polymer rendered electrically conductive by having dispersed uniformly throughout a sufficient quantity of electrically conductive carbon black to provide an electrical resistance of less than 1 .times. 10.sup.10 ohms per centimeter for each filament at a direct current potential of 0.1 volt as measured at 20% relative humidity and 21.degree.C. The cross sectional area of the second constituent comprises from about 1 to 30 percent of the cross sectional area of the whole filament.