Colored microparticle dispersion

A water-based ink for ink-jet printing, comprising a colored fine particle dispersion, in which:

• a content of water is not less than 20% by mass and not more than 60% by mass;
• the colored fine particle dispersion comprises emulsified particles comprising a pigment and a polymer comprising a constitutional unit derived from a compound (A) represented by the following general formula (I) and a constitutional unit derived from a polymerizable monomer component comprising a hydrophobic vinyl-based monomer;
• wherein BO is a butyleneoxy group, which is at least one group selected from the group consisting of a butane-1,2-diyloxy group, a butane-1,3-diyloxy group and a tetramethyleneoxy group;
• EO is an ethyleneoxy group;
• M is a cation;
• m represents an average molar number of addition of BO and is a number of not less than 1 and not more than 10;
• and n represents an average molar number of addition of EO and is a number of not less than 4 and not more than 25, wherein a content of the constitutional unit derived from said compound (A) is in the range 3 to 20 parts by mass in terms of the monomer based on 100 parts by mass of the constitutional unit derived from said polymerizable monomer component;
• the polymerizable monomer component comprises an ionic monomer;
• a content of the ionic monomer in the polymerizable monomer component is not less than 2% by mass and not more than 20% by mass;
• and
• wherein the pH value of the water-based ink is not less than 7.0 and not more than 11.0.