Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1992-01-08
1996-11-05
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621683, 162183, D21H 2106
Patent
active
055713807
ABSTRACT:
A process in which paper or paperboard is made by forming an aqueous cellulosic slurry, draining said slurry on a screen to form a sheet and drying said sheet, employs a cationic polymer as a substantially single component retention aid. The cationic polymer has a cationic charge density of at least about 3.2 equivalents of cationic nitrogen per kilogram of dry polymer. The cationic polymer also has an Intrinsic Viscosity of at least about 8 dl/g. The polymer is added to the slurry prior to sheet formation in an amount effective to provide at least about a 50 percent increase in retention without more than about a 10 percent decrease in formation.
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Chin Peter
Drake James J.
Miller Robert A.
Nalco Chemical Company
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