| abstract |
(57) [Problem] To provide a cement dispersant excellent in initial water reduction, strength development and stability over time. SOLUTION: Polyalkylene glycol mono (meth) Acrylic ester monomer (a) 40 to 80% by weight, mono (meth) acrylic ester monomer (b) 5 to 30% by weight, carboxylic acid monomer having unsaturated bond (c) Ten~ 40% by weight and 0-30% by weight of monomers copolymerizable with them A cement dispersant comprising, as an active ingredient, a copolymer and / or a copolymer salt obtained by reacting the same. |