| abstract |
(57) [Problem] To provide a production method capable of obtaining a cement dispersant having more excellent dispersibility. SOLUTION: Polyalkylene glycol (meth) acrylate and / or polyalkylene glycol (meth) To obtain a cement dispersant by copolymerizing allyl ether and (meth) acrylic acid and / or maleic acid-based monomer, as a polymerization solvent, the dissolved oxygen concentration at 25 ° C is 0.01 to 4.0 mg / kg. Use an aqueous solution. |