C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/143 (2006.01) B01J 13/00 (2006.01) C01B 33/20 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 17/29 (2006.01)
Patent
CA 2292652
The present invention generally relates to polysilicate microgels. More specifically, the invention relates to a process for preparing aqueous polysilicate microgels which comprises mixing an aqueous solution of alkali metal silicate with an aqueous phase of silica-based material having a pH of 11 or less, to polysilicate microgels per se and to the use thereof as flocculating agents in paper making and water purification. The invention further relates to a process for the production of paper from a suspension of cellulosic fibres, and optional filler, which comprises adding to the suspension at least one cationic or amphoteric organic polymer and a polysilicate microgel, forming and draining the suspension on a wire.
L'invention concerne des microgels de polysilicate et, plus particulièrement, un procédé de préparation de microgels aqueux de polysilicate. Ce procédé consiste à mélanger une solution aqueuse de silicate de métal alcalin à une phase aqueuse de matière à base de silice ayant un pH de 11 maximum. L'invention concerne également les microgels de polysilicate eux-mêmes et leur utilisation comme agents floculants dans la fabrication du papier et la purification de l'eau. L'invention concerne enfin un procédé de production de papier à partir d'une suspension de fibres cellulosiques, et d'éventuelles charges, comportant l'addition à la suspension d'au moins un polymère organique cationique ou amphotérique et d'un microgel de polysicilicate, le formage et le drainage de la suspension sur un fil.
Dahlgren Maj-Lis
Johansson-Vestin Hans
Persson Michael
Tokarz Bozena Stanislawa
Akzo Nobel N.v.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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