Paper making process

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 33/26 (2006.01) D21H 17/63 (2006.01) D21H 17/66 (2006.01) D21H 17/67 (2006.01) D21H 21/10 (2006.01) D21H 23/76 (2006.01)

Patent

CA 2247846

A paper making process comprises: (a) adding to an aqueous paper furnish containing pulp and optionally inorganic filler a water-soluble polyparticulate polysilicate microgel and a water-soluble cationic polymer, and (b) forming and drying the product of step (a), wherein the microgel has an average particle size in the range 20 to 250 nm and a surface area in excess of 1000 m2/g. The polysilicate microgel is preferably a polyaluminosilicate, especially one having a mole ratio of alumina : silica of between 1:10 and 1:1500. The use of such microgels leads to improved drainage and retention characteristics.

Procédé servant à fabriquer du papier et consistant à (a) ajouter à une composition aqueuse de fabrication du papier contenant de la pâte et, éventuellement, une charge inorganique, un microgel de polysilicate en particules soluble dans l'eau et un polymère cationique soluble dans l'eau et (b) à travailler et à sécher le produit obtenu à l'étape (a), le microgel présentant une dimension moyenne de particule située entre 20 et 250 nm et une zone de surface supérieure à 1000 m<2>/g. Le microgel de polysilicate est, de préférence, un polyaluminosilicate présentant, en particulier, un rapport molaire entre alumine et silice situé entre 1:10 et 1:500. L'utilisation de ces microgels permet d'obtenir des caractéristiques améliorées de drainage et de retenue.

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