CC1C=CC([N:8]=[C:9]=[O:10])=CC=1[N:11]=[C:12]=[O:13].C1C([NH2:20])=CC=C(S(C2C=CC(N)=CC=2)(=O)=O)C=1.[C:31]1([OH:37])C=CC=C[CH:32]=1.C(N(CC)CC)C>C(C(C)=O)C>[NH2:20][C:12]([NH2:11])=[O:13].[NH2:8][C:9]([O:37][CH2:31][CH3:32])=[O:10]To 158.5 g of 2,4-toluene diisocyanate was added 240 g of methyl ethyl ketone as a solvent, and 107.5 g of 4,4′-diaminodiphenyl sulfone was added thereto in the form of powder at 30° C. with stirring at 400 rpm over a period of 8 hours. After 1 hour, 26 g of methyl ethyl ketone was added thereto and stirred for another 15 hours to obtain a white viscous slurry reaction mixture. Then, a solution of 89.5 g of phenol in 15.8 g of methyl ethyl ketone was poured into the reaction mixture to be dissolved therein, after which 9.3 g of a 1 wt % solution of triethylamine in methyl ethyl ketone was added thereto as a catalyst over a period of 2 hours, and the reaction was uninterruptedly carried out for 1 hour. Thereafter, the reaction mixture was cooled to 20° C. and continuously stirred for 3 hours to obtain a slurry containing slightly yellow crystals precipitated therein. The slurry was freed of the solvent and concentrated under reduced pressure to be solidified, after which the resulting solid was ground and then dried overnight in a vacuum to obtain 355 g of a urea-urethane composition as slightly yellow powder.
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