The diamines are condensed with phosgene to give methylene diphenyl diisocyanate, a precursor to urethane polymers.
Other uses include rubber processing chemicals (9%), herbicides (2%), and dyes and pigments (2%).As additives to rubber, aniline derivatives such as phenylenediamines and diphenylamine, are antioxidants. The principal use of aniline in the dye industry is as a precursor to indigo, the blue of blue jeans.