Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2011-04-05
2011-04-05
Hug, Eric (Department: 1741)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S168200, C162S168300, C162S181600, C162S181800, C162S183000
Reexamination Certificate
active
07918965
ABSTRACT:
Process for the production of paper, board and cardboard by draining a paper stock with sheet formation in the presence of a retention aid system comprising(i) at least one polymer comprising vinylamine units, in the form of the free bases, of the salts and/or in quaternized form, as the sole cationic polymer,(ii) at least one linear, anionic polymer having a molar mass Mwof at least 1 million and/or at least one branched, anionic, water-soluble polymer and/or bentonite and/or silica gel and(iii) at least one particulate, anionic, crosslinked, organic polymer having a mean particle diameter of at least 1 μm and an intrinsic viscosity of less than 3 dl/g, and use of the retention aid system comprising the components (i), (ii) and (iii) as an additive in the production of paper, board and cardboard.
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Blum Rainer
Champ Simon
Koch Oliver
Leduc Marc
Menke Knut
BASF - Aktiengesellschaft
Chin Peter
Hug Eric
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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