Patent ID: 9359514
Filing Date: 2016-06-07
CPC Classification: C08G,C09D

Claim Text:
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.