PURPOSE: To obtain an ink for particulate dispersing element type ink jet recording, enabling high-quality image recording and printing even in recording paper having low paper quality and having high reliability.
CONSTITUTION: In this ink for particulate dispersant type ink jet recording containing recording material components not dissolving in a medium, e.g. carbon black, an organic pigment and colored resin particles and particles for viscosity controlling added as necessary as dispersoinds and containing water as a main dispersing medium, the ink is controlled so that the dispersoid concentration and viscosity satisfy the formula {log(ηi)-log(η0)}/([S]2)≥5 [ηi is ink viscosity (at 20°C) [cpd]; S is dispersoid concentration [effective volume ratio] (e.g. 0.005≤S≤0.5); η0 is aqueous dispersing medium (at 20°C)]}. Thereby, high-quality recording free from spreading is realized.
SHIMOMURA TETSUO
HOTSUTA YASUNARI
YAMADA YOZO
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