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US 7,732,495 B2Granted
Silica-based sols and their production and use
AssigneeAkzo Nobel N.V.
InventorsGlenn Mankin, Marek Tokarz, Freddie Hansson
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AssigneeAkzo Nobel N.V.
InventorsGlenn Mankin, Marek Tokarz, Freddie Hansson
Estimating the term…
The invention relates to a process for producing aqueous silica-based sols which comprises providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; adjusting the pH of the aqueous slurry and separating the ion exchange resin from the aqueous slurry, as well as the silica-based sols obtained by the process. The invention also relates to silica-based sols obtained by the process, as well as a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibres; adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and dewatering the obtained suspension to provide a sheet or web of paper.
A process for producing an aqueous silica-based sol containing aggregated silica-based particles which comprises:
A process for producing a silica-based sol containing aggregated silica-based particles which comprises:
A process for producing an aqueous silica-based sol containing aggregated silica-based particles which comprises:
Dependencies are inferred from the claim text.