| 摘要 |
The present invention provides: a method 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. Provided are: a production method [1] for a fine organic pigment, said production method including a step (1) in which an organic pigment starting material, a water-soluble inorganic salt, a water-soluble organic solvent, and at least 0.6 but not more than 4.0 parts by mass of water per 100 parts by mass of the water-soluble inorganic salt are mixed, and the resultant mixture is kneaded; a fine organic pigment [2] obtained using the abovementioned method [1]; and a dispersion [3] produced using the abovementioned fine organic pigment [2]. Also provided are: a production method [4] for a fine-organic-pigment paste, said production method being provided with a step (2) in which the mixture kneaded in the abovementioned step (1) is cleaned; a production method [5] for a dispersion, said production method being provided with a step (3) in which an organic solvent, water, and the fine-organic-pigment paste obtained using the abovementioned production method [4] are subjected to dispersion treatment; and a production method [6] for an ink, said production method being provided with a step (4) in which at least one selected from water and an organic solvent is mixed with the dispersion obtained using the abovementioned production method [5]. |
