| 摘要 |
PURPOSE: To obtain a new compound hardly developing a color or a stain on a coated surface which should be white color in the case of using it for a recording material such as a pressure sensitive recording material and a heat sensitive recording material. CONSTITUTION: This acid color developing-type achromatic dye comprises a compound of the formula [R<1> , R<2> , R<4> are each a lower alkyl or an aralkyl; R<3> is an aralkyl or phenyl (provided that the phenyl group may bind with the ring I to form a heterocyclic ring); R<5> is an aralkyl or phenyl; R<6> is an alkyl substituted by an ether]. For example, di(4-N-phenyl-N-methylaminophenyl)-3-N-n- butylcarbazolylmethyl 2-methoxyethyl ether. The compound of the formula is obtained e.g. as a precipitate by dissolving di(4-N-phenyl-N- methylaminophenyl)-3-N-n-butylcarbazolylmethane obtained by the condensation under an acidic condition of N-n-butycarbazole-3-aldehyde with N- methyldiphenylamine, in dioxane, adding 2, 3-dichloro-5, 6-dicyano-1, 4- benzoquinone, then adding sodium 2-methoxyethylate/2-methoxyethanol solution and then precipitating by adding methanol. |
