Patent ID: 6303002
Filing Date: 2001-10-16
Classification: D21H,Y10S

Abstract:
A process for the production of paper, board and cardboard from paper stocks which contain tacky impurities, the process comprisingadding nonionic surfactants and cationic polymers having a charge density of at least 1.5 meq/g (measured at pH 7) to paper stocks;draining the paper stocks; andproducing a paper from the paper stock with the tacky impurities fixed in the paper, whereinthe cationic polymers are selected from the group consisting of polymers containing vinylamine units; water-soluble, crosslinked polyamidoamines; water-soluble, ethyleneimime-graft, crosslinked polyamidoamines, uncrosslinked polyamidoamines; crosslinked polyethyleneimines; polydiallyldimethylammononium halides; cationic polyacrylamides; and dicyandiamide/formaldehyde condensates;the molar mass MW of the cationic polymers is from 50,000 to 1 million; andthe surfactants are added in an amount of from 0.10 to 0.5% by weight, based on dry paper stock.