Aqueous silica-containing composition and process for...

D - Textiles – Paper – 21 – H

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D21H 17/68 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2470803

The present invention relates to an aqueous silica-containing composition comprising an anionic organic polymer having at least one aromatic group and anionic aggregated or microgel formed silica-based particles. The aqueous silica-containing composition contains the anionic organic polymer having at least one aromatic group and the anionic silica-based particles in an amount of at least 0.01 % by weight of the total weight of the aqueous silica- containing composition. The aqueous silica-containing composition contains substantially no cellulose-reactive sizing agent and the anionic organic polymer having at least one aromatic group is not an anionic naphthalene sulphonate formaldehyde condensate.The invention further relates to methods for the preparation of the aqueous silica-containing composition and the use of the aqueous silica-composition as a drainage and retention aid in a process for the production of paper. The invention also relates to a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optionally filler, in which the aqueous silica-containing composition and at least one charged organic polymer are added to the cellulosic suspension.

L'invention concerne une composition aqueuse contenant de la silice, comprenant un polymère organique anionique possédant au moins un groupe aromatique et des particules à base de silice anioniques agrégées ou en microgel. Ladite composition aqueuse contenant de la silice contient le polymère organique anionique possédant au moins un groupe aromatique et les particules à base de silice anioniques à raison d'au moins 0,01 % en poids du poids total de la composition aqueuse contenant de la silice. La composition aqueuse contenant de la silice ne contient sensiblement pas d'agent de collage réagissant à la cellulose et le polymère organique anionique possédant au moins un groupe aromatique n'est pas un condensat de naphtalène sulfonate formaldéhyde anionique. L'invention porte également sur des procédés de préparation de la composition aqueuse contenant de la silice et sur l'utilisation de ladite composition en tant qu'agent séquestrant et agent de rétention dans un procédé de production de papier. L'invention porte également sur un procédé de production de papier à partir d'une suspension aqueuse contenant des fibres de cellulose, et éventuellement une charge, dans lequel la composition aqueuse contenant de la silice et au moins un polymère organique chargé sont ajoutés à la suspension cellulosique.

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