D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/10 (2006.01)
Patent
CA 2576611
The invention relates to a method for the production of paper, paperboard and cardboard by dripping a paper material onto a sieve, by forming sheets and then drying the sheets. The sheets are formed in the absence of fine- particled, inorganic, flocculating agents and the retention agent is used as (a) polymers containing vinylamine units and/or polyvinylformamide having a molar mass Mw of, respectively, at least 1 million and (b) at least one cationic or non-ionic polyacrylamide and/or a cationic or non-ionic polymethacrylamide having a molar mass Mw of, respectively, at least 2.5 million.
Procédé de fabrication de papier et de carton par égouttage d'une pâte à papier sur un tamis, des feuilles étant formées, et par séchage desdites feuilles. La formation de feuilles est effectuée en l'absence d'agents floculants inorganiques à particules fines. L'agent de rétention utilisé contient (a) des polymères contenant des unités vinylamine et / ou du polyvinylformamide ayant chacun une masse molaire Mw d'au moins 1 million et (b) au moins un polyacrylamide cationique ou non ionique et / ou un polyméthacrylamide cationique ou non ionique ayant chacun une masse molaire Mw d'au moins 2,5 millions.
Blum Rainer
Leduc Marc
Leifert Peter
Basf Aktiengesellschaft
Robic
LandOfFree
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