| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an aqueous dispersing agent comprising graft copolymer that has excellent dispersion property of dispersoids such as pigment and can stably maintain dispersion state for a long period, and provide a watercolor ink using the dispersing agent. <P>SOLUTION: The aqueous dispersing agent comprises a graft copolymer in which the side chain has a structure represented by general formula [1] (wherein R<SB>1</SB>, R<SB>2</SB>are each H atom or an alkyl group, X is an oxygen atom, an alkylenedioxy group or urethane group, m is 1 to 20, and n is 1 to 5), the main chain includes a vinyl aromatic monomer and an alicyclic (meth)acrylic group as essential components and which has an acid value in the range of 40 to 150 mg-KOH/g. A watercolor ink comprises the aqueous dispersing agent and contains coloring agent such as pigment or the like and an aqueous medium. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
