Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
2011-04-05
2011-04-05
Metzmaier, Daniel S (Department: 1762)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C423S338000
Reexamination Certificate
active
07919535
ABSTRACT:
The invention relates to an aqueous sol containing silica-based particles which sol has a specific surface area of at least 115 m2/g aqueous sol and an S-value within the range of from 10 to 45% or contains silica-based particles having a specific surface area of at least 550 m2/g and less than 1000 m2/g SiO2. The invention further relates to processes for the production of said aqueous sol and the use of the aqueous sol containing silica-based particles as a drainage and retention aid in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which silica-based particles and at least one charged organic polymer are added to the cellulosic suspension.
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Dahlgren Maj-Lis
Johansson-Vestin Hans
Persson Michael
Tokarz Marek
Akzo Nobel N.V.
Metzmaier Daniel S
Morriss Robert C.
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