Patent ID: 8637591

Claim:
A water dispersion for ink-jet printing which is produced by a process comprising the following steps I and II: Step I: dispersing a mixture containing a water-insoluble polymer, carbon black (a) having an acid group content of from 0 to 200 μmol/g, carbon black (b) having an acid group content of more than 200 μmol/g but not more than 1000 μmol/g, an organic solvent and water, in which a difference between acid group contents of the carbon blacks (a) and (b) is from 100 to 1000 μmol/g, to obtain a dispersion; and Step II removing the organic solvent from the dispersion obtained in the step I to obtain a water dispersion; wherein a weight ratio of the carbon black (a) to the carbon black (b) [carbon black (a)/carbon black (b)] is from 10/90 to 15/85.