Ink jet recording water-based ink and method for producing the same

摘要

Disclosed are an ink jet recording water-based ink having excellent long-term storage stability and ejection stability at a pigment concentration greater than or equal to a certain level and a simple and efficient method for producing such a water-based ink. The present invention provides an ink jet recording water-based ink in which the total content of polyvalent metals as impurities in the water-based ink is not more than 1.2 ppm in terms of 1 mass % of a pigment concentration. Furthermore, the present invention provides a method for producing an ink jet recording water-based ink; the method enables efficient production of the above-mentioned ink jet recording water-based ink through a contact treatment with a particulate chelating resin in which each resin particle contains both an alkali metal-bonded chelating group and a hydrogen-bonded chelating group.

主权项

1. A method for producing an ink jet recording aqueous ink, the method comprising:
a contact treatment of an aqueous liquid with an iminodiacetic acid-type chelating resin, the aqueous liquid to be treated having a pH value of 8 to 11, wherein the iminodiacetic acid-type chelating resin is in the form of particles or fibers, wherein the aqueous liquid contains a pigment, an anionic group-containing resin, and a basic compound, wherein each particle or fiber of the iminodiacetic acid-type chelating resin contains chelating groups, which include a potassium-bonded chelating group and a hydrogen-bonded chelating group, and wherein the iminodiacetic acid-type chelating resin used in the contact treatment consists of a proportion of the potassium-bonded chelating group in all of the chelating groups in the range of 30 mol % to 90 mol %, wherein a total content of polyvalent metals as impurities in the ink jet recording aqueous ink is not more than 1.2 ppm in terms of 1 mass % of a pigment concentration.