| 摘要 |
The present invention relates to a drainage and retention aid composition which comprises: (g) a first anionic component which is a water-soluble anionic organic polymer; (h) a second anionic component which is a water-dispersible or branched anionic organic polymer; and (i) a third anionic component which is an anionic siliceous material; wherein the first, second and third anionic components are present in a dry matter content of from 0.01 to 50% by weight.
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