Patent ID: 6576086
Filing Date: 2003-06-10
Classification: C08F,C08G,D21H

Abstract:
A process for the production of paper, board and cardboard, comprising:draining a paper stock containing interfering substances in the presence of an uncrosslinked fixing agent which is a reaction product prepared by reacting an amino- or ammonium-containing polymer selected from the group consisting of: a polymer containing vinylamine units, a polyalkylenepolyamine, a polyamidoamine, an ethyleneimine-grafted polyamidoamine, a polydiallyldimethylammonium chloride, a polymer containing dialkylaminoalkylacrylamide units or dialkylaminomethacrylamide units, a polyallylamine, and a dicyandiamide and formaldehyde condensate, with a reactive size for paper in a weight ratio of polymer to reactive size ranging from 15,000:1 to 1:5, the uncrosslinked fixing agent fixing water-soluble interfering substances, colloidal interfering substances and water-insoluble tacky impurities to the fibers of the paper stock.