| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a difficultly agglomerable powdery cement dispersant. SOLUTION: The powdery cement dispersant is produced by synthesizing an inorganic carrier in an aqueous solution of the following cement dispersant (A) and drying the aqueous solution to form a powder. Component A is a water-soluble vinyl copolymer comprising 40 to 85 mol% at least one member (component A1) selected from an olefinmonocarboxylic acid and a salt thereof and 15 to 60 mol% at least one member (component A2) selected from an alkoxypolyethylene glycol (meth)acrylate and a (meth)allylsulfonate, and 0 to 5 mol % at least one member (component A3) selected from an alkyl (meth)acrylate and a hydroxyalkyl (meth)acrylate (the total being 100 mol%) and having a number-average molecular weight of 2,000 to 50,000. COPYRIGHT: (C)2005,JPO&NCIPI |
