the polymer molecule is added to the copolyamide filaments to impart antistatic qualities useful modifiers have a molecular weight of at least about 800 to 5000 and are dispersed throughout the filament substantially as a separate phase in the form of discrete elongated conductive particles aligned essentially parallel to the filament axis all as described in alderson u s pat no 3 900 676 the elongated conductive particles should have a ratio of their length l to average diameter d of at least about 100 as taught in said alderson patent in preparing the products of the present invention the n alkyl polycarbonamide if employed may be mixed directly with the fiber forming copolyamide and then immediately spun into filaments if desired it may be combined with polymer flake and then spun into filaments less reactive n alkyl polycarbonamides can be introduced into the autoclave during production of the fiber forming polycarbonamide preferably the n alkyl polycarbonamide and fiber forming nylon 6 6 6 are mixed in molten condition and immediately spun into filaments particularly useful n alkyl polycarbonamides are disclosed in column 3 line 7 through line 21 of column 4 of u s pat no 3 900 676 in the examples i and ii which follow the modifier employed is the reaction product of a mixture of 80 n n 39 di n butyl hexamethylene diamine and 20 of mono n butyl hexamethylene diamine and dodecanedioic acid stearic acid is employed as a viscosity stabilizer the modifier had a melting point less than 0 u00b0 c a calculated molecular weight of about 2100 and a viscosity of 1100 centistokes at 95 u00b0 c the copolyester employed herein consists essentially of ethylene terephthalate units and from about.