| 摘要 |
The present invention relates to a water dispersion for ink-jet printing including two kinds of carbon blacks (a) and (b) and a water-insoluble polymer which adheres to a surface of the respective carbon blacks (a) and (b), wherein the carbon black (a) has an acid group content of from 0 to 200 μmol/g and the carbon black (b) has an acid group content of more than 200 μmol/g but not more than 1000 μmol/g, and a difference between acid group contents of the carbon blacks (a) and (b) is from 100 to 1000 μmol/g, and a water-based ink for ink-jet printing which contains the water dispersion. The water-based ink is excellent in image density, fixing property, high lighter fastness, image uniformity, ejection reliability and storage stability.
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