AbstractAniline‐modified epoxy resin which contains tertiary amine in the middle of the polymer chain was synthesized by the reaction of aniline and epoxy resin. The resulting aniline‐modified epoxy resin and two commercial epoxy resins with different epoxy equivalent weights were reacted with 2‐ethylhexanol‐blocked toluene diisocyanate (2‐EH‐blocked TDI) to obtain thermally crosslinkable epoxy resins. These epoxy resins were subsequently reacted with various secondary amines and partially neutralized with acetic acid to give thermally crosslinkable cationic resins. The resulting cationic resins were dissolved in suitable solvents and mixed with deionized water to form emulsions. The crosslinking properties, emulsion, and electrodeposition properties of these resins were studied in some detail. The electro‐deposition yields of the emulsions prepared from aniline‐modified epoxy resins were higher than those of other emulsions. The crosslinked films prepared from aniline‐modified epoxy resins were also glossier than those prepared from commercial epoxy resins. High deposition yield and high glossiness were the characteristic properties of the aniline‐modified epoxy resins. Thermal properties were not affected by aniline‐
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