DISAZO PIGMENTS PROCESSES FOR THEIR MANUFACTURE AND USE

摘要

1434162 Disazo pigments CIBA-GEIGY AG 6 March 1974 [7 March 1973] 10027/74 Heading C4P Novel disazo pigments of formula (where R1 and R2 independently are H, hal, CN, CF 3 or C 1-4 alkyl or alkoxy; or aryloxy, phenylsulphonyl or benzoyl optionally substituted by hal or C 1-4 alkyl or alkoxy; m and (n + p) are 1 or 2; X is H, hal, phenoxy, C 1-4 alkyl or alkoxy, NO 2 , CN, CF 3 or a carboxylic ester group; Y is H, hal, C 1-4 alkyl or alkoxy, NO 2 , CN, CF 3 or a carboxylic ester group; provided that when R1 and/or R2 is hal, (n + p) is 1 and when R1 and/or R2 is/are aryloxy, then the aryloxy group is not ortho to the azo group) are prepared by diazotizing the appropriate nitroaniline and coupling with the corresponding bisacetoacetyl-phenylenediamine. An example is given in which the two solutions are fed continuously to a mixing nozzle. The coupling may be carried out in the presence of dispersing agents and organic solvents and also the amine and coupling component may be reacted in an organic solvent using a nitrous acid ester to effect diazotization. Alternatively a diazoamino compound of the nitroaniline may be reacted with the bis-acetoacetyl-phenylenediamine in an organic solvent. The pigments are preferably heated in water or an organic solvent to modify their physical form. The pigments are used for colouring high molecular weight organic material, which may be in the form of plastic melts, spinning solutions, paints, lacquers, or printing inks.