Patent ID: 7442280

Claim:
A process for the production of paper which comprises; (i) providing a suspension containing cellulosic fibers, and optional fillers, (ii) adding to said suspension a drainage and retention aid comprising at least 0.001% by weight, based on dry stock substance, of anionic silica-based particles and at least 0.001% by weight, based on dry stock substance, of a cationic organic polymer which comprises in polymerized form a cationic monomer having an aromatic group represented by the general formula (I): wherein R 1 is H or CH 3 , R 2 and R 3 are each an alkyl group having from 1 to 3 carbon atoms, A 1 is O or NH, B 1 is an alkylene group of from 2 to 4 carbon atoms or a hydroxy propylene group, Q is benzyl, and X − is an anionic counterion, wherein the polymer is prepared from a monomer mixture consisting essentially of from 2 to 50 mole% cationic monomer having an aromatic group and from 98 to 50 mole% (meth)acrylamide; and (iii) forming and dewatering the obtained suspension on a wire, wherein the suspension that is dewatered on the wire has a conductivity between 2.4 and 10 mS/cm.