Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2011-06-07
2011-06-07
Daniels, Matthew J. (Department: 1741)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S158000, C162S164100, C162S181600, C162S185000
Reexamination Certificate
active
07955473
ABSTRACT:
The present invention relates to a process for producing paper which comprises:(vii) providing an aqueous suspension comprising cellulosic fibres,(viii) adding to the suspension after all points of high shear:a first polymer being a cationic polymer having a charge density above 2.5 meq/g;a second polymer; anda third polymer being an organic or inorganic anionic polymer; and(ix) dewatering the obtained suspension to form paper.
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Carlen Joakim
Johansson Birgitta
Solhage Fredrik
Akzo Nobel N.V.
Cordray Dennis
Daniels Matthew J.
Morriss Robert C.
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