| abstract |
An object of the present invention is to provide a dispersant capable of producing a light calcium carbonate slurry having excellent initial fluidity and fluidity stability even when the concentration of light calcium carbonate is high. A light calcium carbonate dispersant comprising a (co) polymer (X) containing a vinyl group-containing monocarboxylic acid (salt) (A) as an essential constituent unit, 1) The weight average molecular weight (Mw) of (X) is 4,000 to 40,000, 2) the ratio (Mw / Mn) of (Mw) to the number average molecular weight (Mn) of (X) is 1.2 to 2.0; 3) (X) is a (co) polymer (X1) having a molecular weight of 1,000 or more and less than 4,000, a (co) polymer (X2) having a molecular weight of 4,000 or more and less than 40,000, and a molecular weight of 40,000 or more (X1) is 10 to 30% by weight, (X2) is 60 to 80% by weight, and (X3) is 1 to 30% by weight based on the weight of (X). A light calcium carbonate dispersant characterized in that the amount is 10 to 10% by weight. [Selection diagram] None |