Patent ID: 9090790
Filing Date: 2015-07-28
Classification: C09D

Abstract:
1. A water-based ink for ink-jet recording comprising: a self-dispersible carbon black modified by carboxylic acid group in a weight concentration of from 1 weight % to 10 weight %; a water; and a water-soluble organic solvent; wherein a weight concentration of phosphate ion in the water-based ink for ink-jet recording is from 5 ppm to not more than 35 ppm, and the water-based ink for ink-jet recording fulfills a following condition (I): in condition (I): (P): the weight concentration of phosphate ion in the water-based ink for ink-jet recording in ppm; and (B): the weight concentration of the self-dispersible carbon black modified by carboxylic acid group in the water-based ink for ink-jet recording in weight %.