Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2005-06-10
2009-02-10
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S158000, C162S164500, C162S168200, C162S181600, C162S181800, C162S185000
Reexamination Certificate
active
07488402
ABSTRACT:
The invention related to process for the production of paper from an aqueous suspension containing cellulosic fibers, and optional fillers, which comprises adding to the suspension (i) a cationic vinyl addition polymer prepared by polymerizing one or more ethylenically unsaturated monomers comprising a cationic monomer; (ii) an anionic polymer having one or more aromatic groups selected from the group consisting of polymers obtained by condensation of formaldehyde with benzene-based and naphthalene-based compounds, polyurethanes, polysaccharides, and lignin-based polymers; wherein (i) and (ii) are separately added to the suspension; and (iii) a low molecular weight cationic organic polymer having a molecular weight in the range of from 2,000 to about 700,000; or an anionic microparticulate material; and forming and draining the obtained suspension on a wire.
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Frölich Sten
Johansson-Vestin Hans E.
Lindgren Erik
Solhage Fredrik
Akzo Nobel N.V.
Burke Michelle J.
Cordray Dennis
Hug Eric
Morriss Robert C.
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