An anionic nanocomposite for use as a retention and drainage aid in papermaking

摘要

According to the present invention, there is provided an anionic nanocomposite for use as a retention and drainage aid in papermaking obtainable by a process comprising the steps of:
<UnorderedLists id="ula01" listStyle="none" compact="compact"><ListItem>a) providing a sodium silicate solution;</ListItem><ListItem>b) adding an anionic polyelectrolyte to the sodium silicate solution; and</ListItem><ListItem>c) combining the sodium silicate solution containing the anionic polyelectrolyte with silicic acid, wherein the silicic acid is combined with the sodium silicate solution containing the anionic polyelectrolyte by adding the silicic acid to the solution or wherein the silicic acid is combined with the sodium silicate solution containing the anionic polyelectrolyte by generating the silicic acid in situ by adding a solution of sodium silicate, also containing an anionic polyelectrolyte or the two can be added separately, to a weak acid ion exchange resin in the hydrogen form.</ListItem></UnorderedLists>