| 摘要 |
PROBLEM TO BE SOLVED: To provide a means to express superior dispersibility and to be easily pulverized in a polycarboxylic acid type cement dispersant. SOLUTION: The powdery cement dispersant has, as a main component, a polycarboxylic acid type copolymer having a repeating unit (I) derived from an unsaturated polyalkyleneglycol type monomer, a repeating unit (II) derived from an unsaturated carboxylic acid type monomer and a repeating unit (III) derived from a branched compound monomer having a branched structure containing 3 or more polyalkylene imine chains in a molecule, or a powdery cement dispersant comprising a polycarboxylic acid type copolymer (A) having a repeating unit (IV) derived from an unsaturated polyalkyleneglycol type monomer and a repeating unit (V) derived from an unsaturated carboxylic acid type monomer and a branched compound (B) with a branched structure containing 3 or more polyalkyleneimine chains in a molecule. COPYRIGHT: (C)2007,JPO&INPIT
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