Papermaking aid

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D - Textiles, Paper

21

H

D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 21/06 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2339983

A novel method of improving drainage rate and retention of fines which is effective in unfilled, newsprint-type furnish without a silica/bentonite-type particle is disclosed. The method comprises adding a cationic or amphoteric starch, and a cationic polyelectrolyte followed by the addition of a high molecular weight anionic polyacrylamide copolymer.

L'invention concerne un procédé relatif à l'amélioration de la vitesse d'égouttage et de la rétention de fines, efficace pour une composition de type papier journal non chargé et dépourvu de particules du type silice/bentonite. Le procédé consiste à effectuer une adjonction d'amidon cationique ou amphotère, et de polyélectrolyte cationique, puis de copolymère de polyacrylamide anionique à poids moléculaire élevé.

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