| 摘要 |
The present invention relates to: a dispersant for calcium carbonate, which can produce a calcium carbonate slurry having a reduced initial viscosity by wet-grinding and can prevent the significant increase in viscosity of the slurry over time; and a process for continuously producing the dispersant. This dispersant for calcium carbonate is produced through a polymerization step and a neutralization step which are carried out sequentially, and is characterized in that the polymerization step comprises supplying a monomer comprising acrylic acid, an aqueous IPA solution, a hypophosphorous acid salt, a persulfuric acid salt and NaOH to a reactor continuously to polymerize the monomer continuously, and the IPA, the hypophosphorous acid salt, the persulfuric acid salt and sodium hydroxide are supplied in amounts of 15-100 parts by mass, 2.0-5.0 parts by mass, 0.5-2.0 parts by weight and 5.0-20 parts by mass, respectively, relative to 100 parts by mass of the monomer, the reaction temperature to be employed in the polymerization step is 68-82°C, and the degree of neutralization in the neutralization step is 15-95 mol%.
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