| 摘要 |
A water-based ink comprising (A) a coloring material; and (B) an aqueous dispersion of polymer particles comprising a water-insoluble graft copolymer having an acrylic polymer side chain (P) and a salt-forming group (Q), wherein the acrylic polymer side chain (P) is a polymer made of at least one monomer represented by the formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>CH<SUB>2</SUB>-C(R<SUP>1</SUP>)COOR<SUP>2</SUP> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUP>1 </SUP>is hydrogen atom or an alkyl group having 1 to 5 carbon atoms; and R<SUP>2 </SUP>is an alkyl group having 1 to 20 carbon atoms. The water-based ink is used for a water-based ink for inkjet printing.
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