A DISPERSANT COMPOSITION

This invention provides a dispersant composition comprising: a). at least one polymer constituted of monomers having naphthalene ring and/or melamine; b). at least one polymer having carboxylic acid and/or phosphoric acid group and/or any group that is hydrolyzed into carboxylic or phosphoric; and c). at least one polymer having a structure of Formula (I): R1 is hydrogen or alky group having carbon number not less than 1, cycloalkyl or cycloalkenyl group having carbon number not less than 3, alkenyl group having carbon number not less than 2, aryl group having carbon number not less than 6; R2 is hydrogen or alky group having carbon number from 1 to 3; A is alkylene group having carbon number from3 or 4; m and n are positive numbers wherein m is more than n and the sum of m and n is more than 9 and less than 12. 1 This invention also provides a use of the dispersant composition in a mortar or concrete, and the weight percentage of the dispersant composition is from 0.01% to 2.5% based on the weight of cement in mortar. This invention further provides an aqueous composition comprising the dispersant composition.