Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2011-08-16
2011-08-16
Halpern, Mark (Department: 1741)
Paper making and fiber liberation
Processes and products
Non-fiber additive
Reexamination Certificate
active
07998314
ABSTRACT:
A method for the production of paper, cardboard and card by adding a microparticle system consisting of a polymer retention agent having a molar mass Mwof at least 2 million and a fine-part inorganic component in order to form a paper material having a material density of a 20 g/l maximum and by dewatering the paper material, wherein the paper material undergoes at least one shearing step prior to or after addition of the retention agent and wherein the retention agent is introduced in a dosed manner into the paper material in at least two places and the fine inorganic component is dosed prior to or after addition of the retention agent or between two dosing points for the retention agent.
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Blum Rainer
Kannengiesser Detlef
Koch Oliver
Prechtl Frank
BASF - Aktiengesellschaft
Halpern Mark
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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