Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1992-09-10
1994-08-16
Alvo, Steve
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621641, 1621683, 162175, 162177, 162178, D21H 1707, D21H 1720
Patent
active
053384067
ABSTRACT:
A polyelectrolyte complex comprising at least one water-soluble, linear, high molecular weight, low charge density cationic polymer having a reduced specific viscosity greater than 2 deciliters/gram (at 0.05 weight % in a 2M NaCl solution at 30.degree. C.) and a charge density of 0.2 to 4 milliequivalents/gram (meq/g), and at least one water-soluble, anionic polymer having a charge density less than 5 meq/g, an aqueous system comprising the polyelectrolyte complex, a composition comprising the polymers which form the polyelectrolyte complex, and paper comprising the polyelectrolyte complex. It is also directed to a process comprising (1) forming an aqueous suspension of cellulosic fibers; (2) adding a strengthening additive so that the aforementioned polyelectrolyte complex is incorporated into the aqueous suspension of cellulosic fibers; and (3) sheeting and drying the fibers to form the desired cellulosic web.
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Alvo Steve
Hercules Incorporated
Szanto Ivan G.
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