| 摘要 |
A process for producing a microcapsule comprises adding water to an liquid organic dispersion at a room temperature, wherein the liquid organic dispersion comprises a colorant particle, a hydrophobic organic solvent, and an aqueous solution containing a water-soluble resin having an acid value of 20 to 400 mgKOH/g and having been neutralized to a neutralization degree of 5 to 50 mol %, and emulsifying the resin through phase inversion to produce a capsule particle in an aqueous phase, wherein the capsule particle comprises a dispersion system containing the colorant particle and the organic solvent, and a wall comprising the resin and encapsulating the dispersion system. In the process, when the amount to be added of water at which a mixture of the resin solution and water becomes clouded by addition of water to the resin solution is given as Y parts by weight, the phase inversion emulsification step is conducted by adding 0.75Y to 1.25Y parts by weight of water relative to 1 part by weight of the solid content of the neutralized resin to the liquid organic dispersion. Thus obtained microcapsule has a small dispersivity of the particle size, a large thickness of the wall, and a high strength.
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