Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2005-05-17
2005-05-17
Fortuna, José A. (Department: 1731)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S118000, C162S115000, C162S116000, C162S117000, C162S117000, C162S119000
Reexamination Certificate
active
06893538
ABSTRACT:
The invention relates to an aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention further relates to a process for the production of an aqueous silica-based sol comprising a nitrogen-containing organic compound which comprises incorporating a nitrogen-containing organic compound into a silica-based sol containing silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention also relates to the use of an aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica as a flocculating agent in the production of pulp and paper and in water purification. The invention further relates to a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional fillers, which comprises adding to the suspension (i) an aqueous silica-based sol comprising an organic nitrogen-containing compound and (ii) at least one charged organic polymer, forming and draining the suspension on a wire.
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Greenwood Peter
Johansson-Vestin Hans E.
Linsten Magnus Olof
Akzo Nobel N.V.
Burke Michelle J.
Fortuna Jos'e A.
Parker Lainie E.
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