| abstract |
(57) [Abstract] [Object] A polymer particle having a fine particle diameter and having a sufficient coloring power by containing a high concentration of a colorant in the polymer particle, and used as an aqueous ink or the like. Provided are a colorant-containing polymer emulsion and a water-based ink which can exhibit high definition of an image at the time and have excellent storage stability. An oil phase containing an ethylenically unsaturated monomer and a colorant is emulsified in water in the presence of a reactive surfactant copolymerizable with the monomer to form an oil phase having an average particle diameter of 20 to 500 nm. After forming a colorant-containing monomer emulsion, a colorant-containing polymer emulsion obtained by copolymerizing the monomer with a reactive emulsifier in the presence of a polymerization initiator, and the emulsion Aqueous ink using |