| abstract |
(57) [Summary] [Object] To provide a dispersant exhibiting excellent dispersibility as a gypsum dispersant, and having a large water-reducing hardening property and a small fluidity change with time as a water-reducing agent for cement. [Structure] General formula (I) A dispersant containing a condensation product obtained by reacting a compound represented by, an aldehyde, an amino acid, an aminobenzenesulfonic acid and an alkali under an aqueous condition in an arbitrary order. |