Patent ID: 6673208
Filing Date: 2004-01-06
Classification: B01J,C01B,C02F,D21H

Abstract:
A process for the production of paper from a suspension of cellulosic fibers, and optional filler, which comprises adding to the suspension at least one drainage and retention aid, said drainage and retention aid comprising at least one cationic or amphoteric organic polymer and aqueous polysilicate microgels obtained by bringing into contact (i) particles of a salt AB with an acid and an aqueous silicate solution, or (ii) an ion A with a protonic acid comprising an ion B in the presence of an aqueous silicate solution, or (iii) an ion A with an ion B and an acid in the presence of an aqueous silicate solution, whereby the ions A and B represent ions of a precipitable salt AB having a pKS value of at least 4, measured at 20Â° C. in water, and forming and draining the suspension on a wire.