Patent ID: 6200420
Filing Date: 2001-03-13
Classification: D21H

Abstract:
A method of increasing retention and drainage in papermaking comprising the steps of:a) forming an aqueous cellulosic papermaking slurry;b) adding to the slurry a polymer selected from the group consisting of cationic, anionic, nonionic and amphoteric flocculants;c) adding to the slurry an anionic nanocomposite, the anionic nanocomposite being prepared by (i) providing a sodium silicate solution; (ii) adding an anionic polyelectrolyte to the sodium silicate solution; and (iii) combining the sodium silicate solution containing the anionic polyelectrolyte with silicic acid; andd) draining the slurry to form a sheet; ande) drying the sheet.