A method for producing a halogenated organic pigment comprising a halogenation step of halogenating an organic pigment with a halogenating agent, wherein the halogenating agent comprises one or more N-haloimide compounds selected from the group consisting of trichloroisocyanuric acid, a metal salt of dichloroisocyanuric acid, tribromoisocyanuric acid, and a metal salt of dibromoisocyanuric acid. According to the present invention, a method for producing a halogenated organic pigment which does not use high toxic raw materials, does not generate a large amount of unfavorable by-products such as hydrogen halide gas and succinimide, and is excellent in terms of safety and productivity can be provided.

Provided is a pigment composition that includes an isoindoline compound, has excellent dispersibility, weather resistance and heat resistance, and good storage stability, and is capable of forming images having high chroma and the like, the pigment composition including an isoindoline compound represented by formula (1) and an isoindoline compound represented by formula (2). Also provided are a colorant composition, a coating material, an ink, an ink set, a printed matter, and a packaging material.

##STR00001##

One embodiment relates to a water-based inkjet yellow ink containing a yellow pigment (A) having a specific partial structure, an organic solvent, a basic organic compound, and water, wherein an amount of the yellow pigment (A) is 1 to 10% by mass of a total mass of the water-based inkjet yellow ink, the basic organic compound contains 0.1 to 1.25% by mass of a basic organic compound (B) having a pKa value of 9.5 or less at 25 C. of the total mass of the water-based inkjet yellow ink, and an amount of an organic solvent having a boiling point of 240 C. or higher under 1 atmosphere is 5% by mass or less of the total mass of the water-based inkjet yellow ink.

One embodiment relates to a water-based inkjet yellow ink containing a yellow pigment (A) having a specific partial structure, an organic solvent, a basic organic compound, and water, wherein an amount of the yellow pigment (A) is 1 to 10% by mass of a total mass of the water-based inkjet yellow ink, the basic organic compound contains 0.1 to 1.25% by mass of a basic organic compound (B) having a pKa value of 9.5 or less at 25 C. of the total mass of the water-based inkjet yellow ink, and an amount of an organic solvent having a boiling point of 240 C. or higher under 1 atmosphere is 5% by mass or less of the total mass of the water-based inkjet yellow ink.

An isoindoline derivative of formula ##STR00001## wherein X is N, CCN or CCOR.sup.2; Y is a radical having an acidic group or a basic group; R.sup.1 is independently from one another halogen or C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen; R.sup.2 is C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen; and n is 0, 1, 2, 3 or 4, with the proviso that Y does not include an acidic group if X is CCN or CCOR.sup.2, and compositions containing the same are provided. The isoindoline derivative and the pigment composition are suitable, for example, for coloring high molecular mass organic material, especially paints, printing inks, resist formulations for color filter applications, electrophotographic toners, cosmetics, plastics, films or fibers.

An isoindoline derivative of formula ##STR00001## wherein X is N, CCN or CCOR.sup.2; Y is a radical having an acidic group or a basic group; R.sup.1 is independently from one another halogen or C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen; R.sup.2 is C.sub.1-C.sub.4-alkyl, said alkyl is unsubstituted or substituted with halogen; and n is 0, 1, 2, 3 or 4, with the proviso that Y does not include an acidic group if X is CCN or CCOR.sup.2, and compositions containing the same are provided. The isoindoline derivative and the pigment composition are suitable, for example, for coloring high molecular mass organic material, especially paints, printing inks, resist formulations for color filter applications, electrophotographic toners, cosmetics, plastics, films or fibers.

The pigment composition contains the isoindoline compound represented by formula (1) below and the isoindoline compound represented by formula (2) below. In the formulae (1) and (2), R.sub.1 to R.sub.4 represent hydrogen atoms, R.sub.5 and R.sub.6 each independently represent alkyl groups, and A and A represent a group represented by formula (3) below or formula (5) below. In the formula (3) and (5), X represents O or NH, R.sub.7 represents an alkyl group or an aryl group, and R.sub.10 to R.sub.14 each independently represent hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, aryl groups, aryloxy groups, thioalkyl groups, or thioaryl groups, ##STR00001## ##STR00002##

The pigment composition contains the isoindoline compound represented by formula (1) below and the isoindoline compound represented by formula (2) below. In the formulae (1) and (2), R.sub.1 to R.sub.4 represent hydrogen atoms, R.sub.5 and R.sub.6 each independently represent alkyl groups, and A and A represent a group represented by formula (3) below or formula (5) below. In the formula (3) and (5), X represents O or NH, R.sub.7 represents an alkyl group or an aryl group, and R.sub.10 to R.sub.14 each independently represent hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, aryl groups, aryloxy groups, thioalkyl groups, or thioaryl groups, ##STR00001## ##STR00002##