A pigment composition contains: an azo pigment that is a reaction product between a coupler and a base; and a pigment derivative, and a content of o-anisidine derived from the coupler is less than or equal to 20 mg/kg in the entire pigment composition. A method for producing the pigment composition includes, after reaction between a coupler and a base to generate an azo pigment, or during the reaction between the coupler and the base, adding a remover for o-anisidine derived from the coupler.

A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance. The yellow toner contains a binder resin and a yellow colorant, wherein, as the yellow colorant, at least one of the compound A represented by the following general formula (1) and the compound B represented by the following general formula (2), and the compound C represented by the following formula (3) are contained: ##STR00001##

A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance. The yellow toner contains a binder resin and a yellow colorant, wherein, as the yellow colorant, at least one of the compound A represented by the following general formula (1) and the compound B represented by the following general formula (2), and the compound C represented by the following formula (3) are contained:

##STR00001##

A pigment composition contains: an azo pigment that is a reaction product between a coupler and a base; and a pigment derivative, and a content of o-anisidine derived from the coupler is less than or equal to 20 mg/kg in the entire pigment composition. A method for producing the pigment composition includes, after reaction between a coupler and a base to generate an azo pigment, or during the reaction between the coupler and the base, adding a remover for o-anisidine derived from the coupler.

The present invention provides a compound capable of improving the dispersibility of yellow, magenta, cyan, and black pigments in a water-insoluble solvent and a pigment-dispersing agent. The present invention also provides a pigment composition, a pigment dispersion, and a toner, which have satisfactory tinting strength. The present invention relates to a compound having a structure in which an azo skeleton structure is bound to a polymer portion via a linking group in the azo skeleton structure.

To provide a method for producing a compound that enhances dispersibility of a pigment of respective colors in a water-insoluble solvent, as well as a pigment dispersant, and a pigment composition, a pigment dispersion and a toner having a good tinting power. A method for producing a compound, including the following: (i): subjecting a polymerizable monomer forming a monomer unit represented by formula (1) to radical polymerization in the presence of a radical polymerization initiator and an iodine molecule to provide a polymer; and (ii): binding a colorant to a terminal of a main chain of the polymer: ##STR00001##
wherein
R.sub.1 represents a hydrogen atom and an alkyl group, and
R.sub.2 represents a phenyl group, a carboxyl group, an alkoxycarbonyl group or a carboxamide group.