| 摘要 |
<p>A cement dispersion agent comprising calcium polystyrene sulfonate having a weight average molecular weight of 5,000 to 50,000 and having a sulfonation degree of 80% or more is provided. Further, a cement dispersion agent comprising (a) a polystyrene sulfonate and (b) at least one component selected from the group consisting of hydroxycarboxylic acids, ketocarboxylic acids, and the salts thereof is also provided.</p> |
