DISAZO COMPOUND, MANUFACTURE AND USE

Japanese Patent JPS60228570

A

Disazo compounds of the formula I (I) in which X and Y are identical or different and denote hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, nitro, trifluoromethyl, carbomethoxy or carboethoxy, A1 and A2, independently of each other, represent hydrogen, methyl or ethyl and Z1 and Z2 in the 6- or 7-position of the heteroaromatic ring system, independently of each other, represent hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, carbomethoxy, carboethoxy or nitro, are obtained by coupling a monodiazotized p-diaminobenzene substituted by X and Y analogously to the formula I with a 5-acetoacetylaminobenzimidazolone which carries the radicals A1 and Z2 analogously to the formula I, and reacting the resulting aminoazo compound after another diazotization with a 5-acetoacetylaminobenzimidazolone which carries the radicals A2 and Z2 analogously to the formula I, to give the disazo compound of the formula I. The crude product is subsequently thermally aftertreated at 80 DEG to 200 DEG C. In the case where X, Y or Z1 does not denote a nitro group, it is possible to use as an alternative to the p-diaminobenzene derivative a corresponding p-aminonitrobenzene derivative. In this case, analogous diazotization and coupling is followed by reduction of the resulting nitroazo compound to the aminoazo compound, which is converted into the compound of the formula I as described above. The symmetrical or asymmetrical disazo compounds of the formula (I) are obtained in a particle size of