| abstract |
The present invention provides: a method [1] for producing a fine organic pigment having an extremely small primary particle size; a fine organic pigment obtained using this method; a production method for a dispersion in which the fine organic pigment is used; a dispersion obtained using this method; and a production method for an ink in which the dispersion is used. This production method [1] for a fine organic pigment includes a step (1) in which (A) an organic pigment starting material having, in molecules thereof, oxygen, and nitrogen bonded to hydrogen, (B) a water-soluble inorganic salt, (C) a water-soluble organic solvent, (D) at least 0.6 but not more than 7.0 parts by mass of water per 100 parts by mass of the water-soluble inorganic salt, and (E) at least 1.5 but not more than 35 parts by mass of a water-soluble basic compound per 100 parts by mass of the organic pigment starting material are mixed, and the resultant mixture is kneaded. |