Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2007-01-02
2007-01-02
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S168300
Reexamination Certificate
active
10326316
ABSTRACT:
The present invention refers to a process for the production of paper from a suspension containing cellulosic fibers, and optionally fillers, comprising adding to the suspension at least one cationic organic polymer and an aqueous silica-containing composition comprising an anionic naphthalene sulphonate formaldehyde condensate and anionic silica-based particles, the composition having a weight ratio of naphthalene sulphonate formaldehyde condensate to silica-based particles within the range of from 0.2:1 to 99:1, and containing naphthalene sulphonate formaldehyde condensate and silica-based particles in an amount of at least 0.01% by weight, based on the total weight of the aqueous silica-containing composition, and with the proviso that the composition contains substantially no cellulose-reactive sizing agent. The invention also encompasses an aqueous silica-containing composition and a method for preparation of an aqueous silica-containing compound.
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Johansson-Vestin Hans
Nordin Jan
Nyander Johan
Pal Annika Viola
Akzo Nobel N.V.
Burke Michelle J.
Hug Eric
Lopez Carlos
Morriss Robert C.
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