Methanol → Urea Urethane

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To 17 g of 2,4-toluene diisocyanate was added 40 g of methyl ethyl ketone as a solvent, followed by adding dropwise thereto 3.8 g of methanol, and the reaction was carried out with stirring at 60° C. for 5 hours. Then, 9.9 g of 4,4′-diaminodiphenyl sulfone was added thereto, and the reaction was carried out with stirring at 60° C. for 4 hours. After completion of the reaction, the methyl ethyl ketone as solvent was removed by the use of an evaporator, and the residue was dried overnight in a vacuum to obtain 16 g of a urea-urethane composition as white crystals. The melting point of the white crystals was 169° C. In IR analysis on the crystals, characteristic peaks due to a urea-urethane compound appeared at 1660 cm−1 and 1740 cm−1. The content of the urea-urethane main constituent in the urea-urethane composition was 52% as measured by liquid chromatography.

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