Silica-based sols

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 33/143 (2006.01) C01B 33/149 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2691343

The invention relates to a sol containing silica-based particles having an axial ratio of at least about 10 and specific surface area of at least about 600 m2/g. The invention further relates to a sol containing silica-based particles having an axial ratio of at least about 10 and S-value up to about 25. The invention further relates to a sol containing silica-based particles having an axial ratio of at least about 10 and a specific surface area of at least about 400 m2/g, wherein the silica-based particles are surface-modified. The invention further relates to a sol containing silica-based particles having a viscosity of at least 50 cP and silica content of at least about 3 % by weight, wherein the silica-based particles have a specific surface area of at least about 400 m2/g. The invention further relates to a process for producing the aqueous silica-based sol according to the invention, a sol containing silica-based particles obtainable by the process, use of the sol containing silica- based particles as a flocculating agent. The invention further relates to a process for producing paper in which the sol containing silica-based particles is used as a drainage and retention aid..

L'invention concerne un sol contenant des particules à base de silice ayant un rapport axial d'au moins environ 10 et une surface spécifique d'au moins environ 600 m?/g. Elle a trait en outre à un sol contenant des particules à base de silice ayant un rapport axial d'au moins environ 10 et une valeur S allant jusqu'à environ 25. L'invention concerne également un sol contenant des particules à base de silice ayant un rapport axial d'au moins environ 10 et une surface spécifique d'au moins environ 400 m?/g, les particules à base de silice ayant une surface modifiée. L'invention concerne en outre un sol contenant des particules à base de silice ayant une viscosité d'au moins 50 cP et une teneur en silice d'au moins environ 3 % en poids, les particules à base de silice ayant une surface spécifique d'au moins environ 400 m?/g. Elle se rapporte en outre un à procédé de production du sol aqueux à base de silice selon l'invention, un sol contenant des particules à base de silice pouvant être obtenu par le procédé, et l'utilisation du sol contenant des particules à base de silice en tant que produit floculant. L'invention a également pour objet un procédé de production de papier dans lequel le sol contenant des particules à base de silice est utilisé en tant qu'auxiliaire de drainage et de rétention.

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