Improvements in or relating to application of material to a...

D - Textiles – Paper – 21 – H

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D21H 23/76 (2006.01) D21H 17/28 (2006.01) D21H 17/37 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 17/45 (2006.01) D21H 21/18 (2006.01) D21H 23/10 (2006.01)

Patent

CA 2197349

The invention relates to a process of applying a polyhydroxy high molecular weight polymer or like material to a substrate, comprising adding to a solution of such material in anionic form a flocculent of oppositely charged form in order to insolubilise such material, and thereafter applying such insolubilised material to said substrate. The invention has particular application in respect of production of paper by adding to the slurry supplied in paper production of an anionic starch and a cationic flocculent in predetermined amounts. The cationic polymer is preferably added prior to addition of the anionic starch. The cationic polymer preferably has a molecular weight of 150,000 or more and the anionic starch is preferably added in an amount of from 75 % to 125 % of the reaction ratio amount. Preferably, the cationic polymer flocculent is added in an amount of 0.5 kg or more per 1,000 kg of paper substrate and the anionic starch showing an amount of 2 kg or more per 1,000 kg of paper substrate.

Procédé d'application d'un polymère polyhydroxy de poids moléculaire élevé ou matériau analogue sur un substrat, qui consiste à ajouter à une solution dudit matériau se présentant sous forme anionique un floculant de forme à charge opposée afin d'insolubiliser ledit matériau, et à appliquer ce matériau insolubilisé sur ledit substrat. La présente invention concerne particulièrement la production de papier par ajout à la pâte liquide utilisée dans la production de papier d'un amidon anionique et d'un floculant cationique dans des quantités prédéterminées. Le polymère cationique est de préférence ajouté avant l'amidon anionique. Il a de préférence un poids moléculaire de 150.000 ou plus et l'amidon anionique est de préférence ajouté dans une quantité allant de 75 % à 125 % de la quantité du rapport de réaction. De préférence, le floculant polymère cationique est ajouté à raison de 0,5 kg ou plus par 1.000 kg de substrat papier et l'amidon anionique à raison de 2 kg ou plus par 1.000 kg de substrat papier.

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