Making water dispersible/reducibleblocked-isocyanates facilitates incorporation of blocked isocyanates into an aqueous dispersion of coreactant. Anionically modified methyl ethyl ketoxime (MEKO), -caprolactam (CL) and 3,5-dimethylpyrazole (DMP) blocked aromatic diisocyanates (TDI and MDI) dispersible isocyanate adducts were prepared by introducing ionic pendantgroups and characterized by FTIR, GPC, DSC and TGA techniques. It was found that molecular weights of MDI-based polyisocyanates were higher. Thermal studies showed that the de-blocking temperature of the isocyanate adducts decreases in the order: -caprolactam > methyl ethyl ketoxime > 3,5-dimethylpyrazole. It was also found that the dispersions of blocked adducts are stable and compatible with polyurethane (polyether and polyester based) and acrylic dispersions.