| 摘要 |
[PROBLEMS] To microparticulate a yellow pigment having a structure derived from barbituric acid (e.g., C. I. Pigment Yellow 150) and increase the concentration of the pigment in a pigment composition comprising the pigment without increasing the viscosity of the composition after dispersion of the pigment, increasing the aggregation or precipitation in the composition, or increasing the viscosity of the composition over time; and to provide a stable pigment composition which can be used as a coloring agent for a color filter resist or a ink-jet ink. [MEANS FOR SOLVING PROBLEMS] Disclosed is a monoazo metal complex represented by the formula (1). (1) wherein Rrepresents a hydrogen atom, a C-Calkyl group, a C-Calkoxy group, a chlorine atom, a bromine atom or a nitro group; M represents a hydrogen atom, a sodium, a potassium, a magnesium, a calcium, a barium or an aluminum; Mrepresents a n-valent cation; "Metal" represents Ni, Fe, Cu, Co or Al; m represents an integer of 1 or 2; and n represents an integer of 1, 2 or 3.
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