the same molar ratio of doping agent polyaniline mother a film having conductivity of much the same order is obtained but its mechanical properties are distinctly poorer in particular it breaks on bending the same operating mode is followed as in example 1 to prepare a solution except that m cresol is used as solvent instead of dichloroacetic acid a film having more or less similar conductivity is obtained however 10 to 15 by weight of solvent subsists in the film even after extended pumping the residual m cresol is the cause of the film 39 s unpleasant smell in addition on account of the slow release of the solvent the mechanical and electric properties of the film change over time in this example a highly conductive selfsupporting film of polyaniline is prepared the polyaniline being doped with the di 2 ethylhexyl ester of 1 2 benzene dicarboxylic 4 sulphonic acid following the same operating mode as in example 1 but the dichloroacetic acid is replaced by chlorodifluoroacetic acid after pouring a pliable film is obtained whose conductivity measured using the standard 4 point technique is 100 s cm in this example a polyaniline based conductor composite film is prepared in accordance with the invention using polymethylmethacrylate as insulating polymer the base emeraldine polyaniline and doping agent are prepared following the same operating mode as in example 1 a preparation of the polymethylmethacrylate and plasticizer solution in dichloroacetic acid 5 ml of solution are prepared by mixing 1 g polymethylmethacrylate and 0 35 g dibutylphtalate with dichloroacetic acid under vigorous shaking 0 5 ml of the polymethylmethacrylate and plasticizer solution are mixed in dichloroacetic acid with 0 683 ml dichloroacetic solution containing 2 14 mg base emeraldine.