[C:1]([OH:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([OH:6])=[O:5].[OH-].[Na+].C(O)(=O)C=C.S(OOS([O-])(=O)=O)([O-])(=O)=O.[Na+].[Na+]>O>[C:4]([OH:6])(=[O:5])[CH:3]=[CH2:2].[C:1]([OH:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([OH:6])=[O:5]11 g maleic acid was dissolved in 200 g deionized water, and this solution was adjusted to pH 3.85 with 48% aqueous sodium hydroxide. The mixture was heated to 95° C. and kept at 95 to 98° C. in nitrogen atmosphere, and 64 g acrylic acid dissolved in 16 g deionized water, and 4.7 g sodium persulfate dissolved in 50 g deionized water, were separately added dropwise thereto over the period of 2 hours. Thereafter, the reaction solution was kept at 98° C., stirred for 6 hours, and retuned to room temperature to give an aqueous solution of poly(acrylic acid/maleic acid). As a result of measurement of the resulting dispersant by GPC, the weight average molecular weight was 87,000 (determined using polyethylene glycol standards). The conditions for GPC measurement were the same as in Synthesis Example 1.
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