C1(=O)[O:6][C:4](=[O:5])[CH:3]=[CH:2]1.[OH-].[Na+].[C:10]([O-:17])(=[O:16])/[CH:11]=[CH:12]\[C:13]([O-:15])=[O:14].[Na+].[Na+].C(O)(=O)C=C.S(OOS([O-])(=O)=O)([O-])(=O)=O.[NH4+].[NH4+].OO>O>[C:4]([OH:6])(=[O:5])[CH:3]=[CH2:2].[C:10]([OH:17])(=[O:16])/[CH:11]=[CH:12]\[C:13]([OH:15])=[O:14]58.8 g (0.6 mole) of maleic anhydride, 200 g of water, 48 g (1.2 moles) of sodium hydroxide were charged in a flask equipped with a thermometer and a Dimroth condenser. Maleic anhydride was neutralized while performing agitation to prepare an aqueous solution of 30% disodium maleate. After that, the heating was performed to a reflux temperature under the normal pressure. Subsequently, 72 g (0.4 mole) of an aqueous solution of 40% acrylic acid, 50 g of an aqueous solution of 10% ammonium persulfate as an polymerization initiator, and 50 g of an aqueous solution of 14% hydrogen peroxide were gradually added dropwise separately over 4 hours respectively to perform the copolymerization reaction. After the completion of the dropwise addition, the agitation was continued for further 1 hour to complete the copolymerization reaction. After that, the neutralization was performed with 28 g (0.35 mole) of an aqueous solution of 49% sodium hydroxide to obtain an objective substance.
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