| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an aqueous pigment dispersion capable of increasing the concentration in both a hydrophilic and a hydrophobic pigments and having a high gloss and a bright color and a water-based printing ink composition using the pigment dispersion and good in suitability, etc., for spread on water repellent paper. SOLUTION: This aqueous pigment dispersion contains anα-olefin-maleic acid-based copolymer containing at least one group represented by the formula; (C2 H4 O)p (C3 H6 O)q R<1> [R<1> is H or a 1-8C alkyl group; (p) and (q) are each an integer of >=0; [(p)+(q)] is >=1 and (p) and (q) are further a combination of numbers satisfying conditions so as to provide the amount of the formula with <=450] in the molecule and having 50-300 mg KOH/g acid value and 1,000-20,000 weight-average molecular weight as a resin for dispersing a pigment in an amount of 5-1,000 pts.wt. based on 100 pts.wt. of the pigment in the aqueous pigment dispersion prepared by dispersing the pigment in water by using the resin for dispersing the pigment.</p> |
