Process of making paper

Details Process of making paper Process of making paper

D - Textiles, Paper

21

H

9/52

D21H 17/48 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2159592

During the manufacture of paper from a cellulosic suspension, retention is improved by adding to the suspension a water soluble cationic polymer containing 0.1 to 15 mole % cationic monomer groups and having IV at least 4dl/g and then adding a substantially water soluble formaldehyde condensate resin. This resin is preferably a phenol sulphone formaldehyde resin. Preferred phenol sulphone formaldehyde resins are materials wherein at least 70 mole % of the recurring groups are dihydroxy phenyl sulphone groups free of sulphonic acid groups.

Lors de la production de papier à partir d'une suspension cellulosique, on obtient une amélioration de la rétention en ajoutant à la suspension un polymère cationique hydrosoluble contenant 0,1 à 15 moles % de groupes de monomères cationiques et présentant une densité intrinsèque d'au moins 4 dl/g, puis un condensât de résine formaldéhyde sensiblement hydrosoluble, ladite résine étant de préférence du type phénol-sulfone-formol. Les résines préférées de ce type sont celles où au moins 70 moles % des groupes récurrents sont des groupes dihydroxy phényle sulfone exempts de groupes d'acide sulfonique.

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