A sizing composition and a method of sizing

D - Textiles – Paper – 21 – H

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D21H 21/16 (2006.01) D21H 17/62 (2006.01) D21H 17/66 (2006.01) D21H 17/07 (2006.01) D21H 17/08 (2006.01) D21H 17/16 (2006.01) D21H 17/17 (2006.01)

Patent

CA 2328239

A sizing composition and a method of sizing a cellulosic fiber material are disclosed. The sizing composition comprises an aqueous dispersion of a rosin material and a polyaluminium compound, and is characterised in that the polyaluminium compound is a polyaluminium phosphate sulphate compound. The polyaluminium phosphate sulphate compound should comprise at least 5 % by weight, calculated as aluminium on the amount of rosin material in the composition. It is preferred that the sizing composition also comprises a synthetic sizing agent in addition to the rosin material. The dispersion preferably also includes a dispersing agent and has a dry content of at least 1 % by weight. The sizing composition is used for the sizing of cellulosic fibre materials, such as paper, board or paper board by adding 0.01-5 % by weight, calculated as dry sizing agent on dry cellulose fibers, of the sizing composition to the cellulosic fibre material, preferably to a cellulose stock for internal sizing of the cellulosic fibre material.

L'invention concerne une composition de collage et un procédé de collage d'une matière fibreuse cellulosique. La composition de collage comporte une dispersion aqueuse d'une matière de résine et d'un composé de polyaluminium, et est caractérisée par le fait que le composé de polyaluminium est un composé de sulfate phosphate de polyaluminium. Le composé de sulfate phosphate de polyaluminium doit comporter au moins 5 % en poids calculé d'aluminium par rapport à la quantité de matière de résine de la composition. De préférence, la composition de collage comporte également un agent de collage synthétique en plus de la matière de résine. La dispersion comporte également de préférence un agent dispersant, et présente une teneur en matières sèches d'au moins 1 % en poids. On utilise la composition de collage pour coller des matières fibreuses cellulosiques telles que du papier, du carton ou du papier cartonné en ajoutant 0,01-5 % en poids calculé d'agent de collage sec sur fibres de cellulose sèches, de la composition de collage par rapport à la matière fibreuse cellulosique, de préférence une matière première de cellulose permettant un collage interne de la matière fibreuse cellulosique.

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