BIS (3-PYRAZOLIDONE) COMPOUNDS

摘要

4,4'-DI-(3-OXO-1-PYRAZOLIDINO)-DIPHENYLMETHANE COMPOUNDS ARE PREPARED BY HEATING THE CORRESPONDING DI-(N- beta -hydrozypropio)-4,4'-dihydrazidodiphenylmethane compositions in an inert organic solvent and in the presence of an acid dehydration catalyst. Valuable polyureas and mixed polyurethane-polyurea products are formed by reacting a polyisocyanate with these compounds or with mixtures of the novel compounds and conventional polyols.