Abstract: The present invention aims to provide an ink ejection stabilizer that can impart high ejection stability, for example, to an ink such as an ink-jet printing ink. The present invention relates to an ink ejection stabilizer including a polymer (A) that has, in a Kratky plot of a scattering profile determined by a small-angle X-ray scattering method using synchrotron radiation, at least one local minimum in the range where a scattering vector q is 0 nm?1 to 2 nm?1. An aqueous solution of the polymer (A) (polymer (A) concentration: 20 mass %) has a parallel light transmittance of 85% or more.

Abstract: Provided is a method for producing an aqueous pigment dispersion including a step of dispersing a mixture containing a pigment, an anionic group-containing organic polymer compound, a basic compound, and from 1% to 500% by mass of alkylene oxide adduct having a polyamine structure with respect to the pigment into water. The step of dispersing includes Step 1 of kneading a mixture which contains a pigment, an anionic group-containing organic polymer compound, a basic compound, and from 1% to 500% by mass of alkylene oxide adduct having a polyamine structure with respect to the pigment, and which contains no water or water equal to or less than 30% by mass with respect to a solid content thereof, and Step 2 of dispersing a kneaded material obtained in Step 1 into water.

Abstract: Provided is a method for producing an aqueous pigment dispersion including a step of dispersing a mixture containing a pigment, an anionic group-containing organic polymer compound, a basic compound, and from 1% to 500% by mass of alkylene oxide adduct having a polyamine structure with respect to the pigment into water. The step of dispersing includes Step 1 of kneading a mixture which contains a pigment, an anionic group-containing organic polymer compound, a basic compound, and from 1% to 500% by mass of alkylene oxide adduct having a polyamine structure with respect to the pigment, and which contains no water or water equal to or less than 30% by mass with respect to a solid content thereof, and Step 2 of dispersing a kneaded material obtained in Step 1 into water.