| 摘要 |
PURPOSE:To obtain the titled compound useful as a hardener for epoxy resin, etc., in colorless state, by condensing aromatic amines with formalin in the presence of a sulfite or bisulfite and treating the condensation product with hydrazine hydrate. CONSTITUTION:A diphenylmethane compound can be produced by condensing aromatic amines (e.g. o-toluidine) with formalin in the presence of a sulfite (e.g. sodium sulfite or potassium sulfite) or a bisulfite and treating the reaction product with hydrazine hydrate. The reaction is carried out preferably by adding the sulfites prior to the addition of formalin. The amount of the sulfites if 0.2-5pts., preferably 0.5-1pt. per 100pts. of the aromatic amines. |
