PIGMENT-DISPERSED INK-JET INK, INK SET, INK TANK, RECORDING UNIT, INK-JET RECORDING APPARATUS, INK-JET RECORDING PROCESS AND PRODUCTION PROCESS OF PIGMENT-DISPERSED INK-JET INK

摘要

Provided is a pigment-dispersed inkjet ink which improves releasing stability and storage stability to prevent recordings from being scattered, therefore it shows excellent weather resistance to keep image from being scattered. In the pigment-dispersed inkjet ink which is composed of pigment and a resin dispersing agent where acid value of the resin dispersing agent is 50mg KOH/g or more and solubility is 3mass% and less in an alkali solution having 1.5times KOH than the acid value of the resin dispersing agent, the pigment-dispersed inkjet ink is characterized by satisfying 1.1<=(the viscosity of ink measured under 20°C and 0.5s^-1 in shear rate)/(that of ink measured under 20°C and 100s^-1 in shear rate)<=2.0 when using a viscoelastic measurement apparatus to measure viscosity of ink.