Method for the production of paper, cardboard and card

Details Method for the production of paper, cardboard and card Method for the production of paper, cardboard and card

D - Textiles, Paper

21

H

D21H 21/10 (2006.01)

Patent

CA 2624998

Method for the production of paper, cardboard and card by dewatering a paper stock with sheet formation in the presence of a retention agent system made of (i) at least one vinylamine unit-containing polymer in the form of the free bases, the salts and/or in quaternized form as sole cationic polymer, (ii) at least one linear anionic polymer having a molar mass Mw of at least 1 million and/or at least one branched anionic water-soluble polymer and/or bentonite and/or silica gel and (iii) at least one particulate, anionic, crosslinked, organic polymer having an average particle diameter of at least 1 ~m and an intrinsic viscosity of less than 3 dl/g and also use of the retention agent system made of the components (i), (ii) and (iii) as additive in the production of paper, cardboard and card.

L'invention concerne un procédé pour produire du papier, du carton-pâte et du carton par dessiccation de pâte à papier avec transformation en feuille, en présence d'un système d'agent de rétention comprenant (i) au moins un polymère contenant des unités vinylamine, sous forme de bases libres, de sels et/ou sous forme quaternaire en tant que seul polymère cationique, (ii) au moins un polymère linéaire, anionique à masse molaire Mw d'au moins un million et/ou au moins un polymère ramifié anionique hydrosoluble et/ou de la bentonite et/ou du gel de silice et (iii) au moins un polymère organique réticulé anionique en forme de particule ayant un diamètre moyen d'au moins 1 ?m et une viscosité intrinsèque inférieure à 3 dl/g. La présente invention porte également sur l'utilisation de ce système d'agent de rétention comprenant les composants (i), (ii) et (iii) comme additif lors de la production de papier, de carton-pâte et de carton.

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