Copolymer resin was prepared by the condensation polymerization of p-cresol and dithiooxamide with formaldehyde in the presence of HCl acid catalyst and using varied molar ratios of reacting monomers. Copolymer resin composition has been determined on the basis of their elemental analysis and number average molecular weights of these resins were determined by conductometric titrations in non-aqueous medium. The viscosity measurement carried out in DMF indicates normal behavior. UV-visible, IR and NMR spectra were studied to elucidate the structure. Ion-exchange properties of this copolymer resin was studied for Fe3+, Cu2+, Ni2+, Co2+, Zn2+ and Pb2+ ions. A batch equilibrium method was employed in the study of the selectivity of metal-ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths.