| 摘要 |
PROBLEM TO BE SOLVED: To provide a binder for inkjet printing ink, and the inkjet printing ink that can form a printed image having extremely excellent ejection stability and extremely excellent durability such as scratch resistance and alkali resistance of ink.SOLUTION: A binder for inkjet printing ink is obtained by dispersing, in an aqueous medium (D), polyurethane (C) having a structure derived from a vinyl polymer (a1) in a side-chain, obtained by reaction between polyol (A) and polyisocyanate (B), the polyol (A) containing the vinyl polymer (a1) having a comparatively long-chained alkyl group and two hydroxyl groups at one end, and one or more kinds of polyol (a2) selected from a group consisting of polyether polyol, polyester polyol, polyester ether polyol and polycarbonate polyol. Printed matter is also provided. |
