Abstract: An arylamine such as aniline is condensed with formaldehyde in the presence of aqueous hydrochloric acid to form a mass containing the hydrogen chloride salt of a polyarylpolyamine. The mass is contacted with additional aniline thereby forming an organic phase and an aqueous phase, the 4,4'-polyarylpolyamine overwhelmingly being liberated from its salt form in the aqueous phase and being transferred to the organic phase. High recoveries of the 4,4'-diamino polycondensate are achieved.