Patent ID: 7488402
Filing Date: 2009-02-10
Classification: D21H

Abstract:
1. A process for the production of paper from an aqueous suspension containing cellulosic fibers, and optional fillers, which comprises adding to the suspension (i) a cationic vinyl addition polymer prepared by polymerizing one or more ethylenically unsaturated monomers comprising a cationic monomer represented by the general structural formula (II):  wherein R (ii) an anionic polymer having one or more aromatic groups, the anionic polymer being added in an amount of at least 0.001% by weight based on dry cellulosic fibers, and optional fillers, and wherein the anionic polymer is a sulphonated lignin polymer; (iii) an anionic microparticulate material selected from the group consisting of silica-based particles and clay of smectite type; and forming and draining the obtained suspension on a wire.