Ionic liquids (ILs) were fixed into polyether-based polyurethane (PU) films for sustainable antistatic properties. Preliminarily, ILs were screened in terms of efficiency of antistatic effect. Surface resistivity (rho(s)) for IL-doped PU films changed depending the anion species, and the smallest rho(s) was found for the PU films containing bis(trifluoromethanesulfonyl)imide ([Tf2N])-type ILs. Then, [Tf2N]-type ILs composed of ammonium cations having hydroxyl groups were fixed into the PUs through urethane bonds. The fixation of 1000 ppm of the ILs reduced the rho(s) of the PU films from 2.1 x 10(12) to 2.1 x 10(9) Omega sq(-1). These IL-fixed PU films were revealed to possess high washing durability confirmed by negligible change of rho(s) before and after ultra-sonication treatment in methanol. (C) 2014 Elsevier Ltd. All rights reserved.