Sizing of paper

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 21/16 (2006.01) D21H 11/00 (2006.01) D21H 11/22 (2006.01) D21H 17/16 (2006.01) D21H 17/17 (2006.01) D21H 17/25 (2006.01)

Patent

CA 2280136

The invention relates to the use of an aqueous sizing dispersion containing a cellulose-reactive sizing agent and a hydrophobically modified dispersing agent for sizing cellulosic fibres by addition of the sizing dispersion to a stock containing cellulosic fibres, and optional fillers, and dewatering the stock on a wire to obtain a web containing cellulosic fibres, wherein the stock has a cationic demand of at least 50 µeq/litre stock filtrate. The invention further relates to an aqueous dispersion containing a cellulose-reactive sizing agent and an anionic hydrophobically modified cellulose-derivative, its preparation and use in the production of paper. The invention also relates to a substantially water-free composition containing a cellulose-reactive sizing agent and an anionic hydrophobically modified cellulose-derivative, its preparation and use in the preparation of an aqueous dispersion of cellulose- reactive sizing agent.

L'invention concerne l'utilisation d'une dispersion de collage aqueuse renfermant une colle qui réagit à la cellulose et un dispersant hydrophobiquement modifié, pour le collage de fibres cellulosiques par adjonction de la dispersion de collage à une suspension de pâte qui contient des fibres cellulosiques, et des charges à titre facultatif, avant d'essorer ladite suspension sur une toile afin d'obtenir une bande à base de fibres cellulosiques, la solution de pâte ayant une demande cationique d'au moins 50 mu eq/litre de filtrat de la solution de pâte. L'invention concerne également une dispersion aqueuse contenant une colle qui réagit à la cellulose et un dérivé de cellulose anionique hydrophobiquement modifié, ainsi que sa fabrication et son utilisation dans la production de papier. L'invention concerne aussi une composition sensiblement anhydre à base de colle réagissant à la cellulose et de dérivé de cellulose anionique hydrophobiquement modifié, ainsi que sa fabrication et son utilisation dans la préparation d'une dispersion aqueuse de colle réagissant à la cellulose.

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