| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing an aqueous dispersion of a pigment-containing polymer particle suitable for the preparation of a water-based pigment ink composition for inkjet recording use containing an encapsulated pigment and to provide a water-based pigment ink composition containing the aqueous dispersion of a pigment-containing polymer particle obtained by the production method. <P>SOLUTION: The method for producing an aqueous dispersion of a pigment-containing polymer particle comprises (1) a step for preparing a resin solution by dissolving a vinyl resin in an ethylenic unsaturated monomer, (2) a step for preparing a pigment-dispersed resin solution by adding a pigment to the resin solution and homogenizing the mixture, (3) a step for preparing a mini-emulsion by adding the pigment-dispersed resin solution to an aqueous solution of an emulsifier and homogenizing the mixture to disperse the pigment-dispersed resin solution in water, and (4) a step for adding a radical initiator to the mini-emulsion and polymerizing the monomer. <P>COPYRIGHT: (C)2008,JPO&INPIT |
