Polyaniline was synthesized in the presence of lignosulfonic acid to yield a product (LIGNO-PANI) that is water-dispersible. Several samples ranging from 0 to 70% lignosutfonate (LS) were prepared. These samples were then evaluated for differences in dispersibility and conductivity. As the percent of LS in the samples was increased, the water-dispersibility of the LIGNO-PANI also increased. The particle size of the samples as well as the conductivity of the samples decreased with increasing percentages of LS in the samples. After extensive washings, however, the conductivity remained fairly constant (similar to 0.4 S/cm) regardless of the amount of LS in the samples. Additionally, elemental analysis, TGA, and IR data were used to demonstrate that the LS is grafted to polyaniline during the synthesis of LIGNO-PANI. (c) 2008 Wiley Periodicals, Inc.