Production of filled paper and compositions for use in this

Details Production of filled paper and compositions for use in this Production of filled paper and compositions for use in this

D - Textiles, Paper

21

H

D21H 17/64 (2006.01) D21H 21/10 (2006.01) D21H 23/76 (2006.01) D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/53 (2006.01) D21H 17/55 (2006.01) D21H 17/56 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2180373

Filled paper is made by adding a cationising amount of cationic polymer to a slurry of precipitated calcium carbonate, mixing this slurry into a cellulosic suspension and forming a thin stock, adding anionic particulate material to the suspension before or after the slurry, mixing a polymeric retention aid into the thin stock which includes the precipitated calcium carbonate and the anionic particulate material, draining the thin stock on a screen to form a sheet and drying the sheet. A suitable slurry for this purpose is a slurry of 5 to 70% by weight precipitated calcium carbonate and cationic polymer selected from 0.1 to 1% cationic starch and 0.01 to 0.3% of a high charge density, relatively low molecular weight, cationic polymer.

Préparation de papier chargé, consistant à ajouter une quantité cationisée d'un polymère cationique à une suspension épaisse de carbonate de calcium précipité, à ajouter cette suspension à une suspension cellulosique pour former une pâte légère, à ajouter des particules de matière anioniques à la suspension avant ou après la suspension épaisse, à mélanger un auxiliaire de rétention polymérique à la pâte légère qui renferme le carbonate de calcium précipité et les particules de matière anioniques, à égoutter la pâte légère sur un tamis pour former une feuille, et à sécher celle-ci. Une suspension épaisse convenant bien pour la présente application contiendrait de 5 à 70 % en poids de carbonate de calcium précipité et d'un polymère cationique, à savoir 0,1 à 1 % d'amidon cationique ou 0,01 à 0,3 % d'un polymère cationique à forte densité de charge et de masse moléculaire relativement faible.

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