Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1992-11-13
1993-11-30
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621681, 162183, D21H 1734
Patent
active
052661644
ABSTRACT:
The invention provides a method for improving the retention of mineral fillers and cellulose fibers on a cellulosic fiber sheet. The method comprising the steps of preparing a cellulose pulp slurry; adding before a shearing step an effective amount of a copolymer flocculant to the cellulose pulp slurry, the copolymer flocculant is a high molecular weight cationic copolymer of acrylamide and diallyl dimethyl ammonium chloride, the flocculant copolymer should contain from about 20 to about 60 mole percent diallyl dimethyl ammonium chloride mer units. After a shearing step adding an effective amount of a high molecular weight water-soluble anionic flocculant. A cellulosic fiber sheet is then formed from the cellulose pulp slurry which includes both the copolymer flocculant and anionic flocculant.
REFERENCES:
patent: 4753710 (1988-06-01), Langley et al.
patent: 4913775 (1990-04-01), Langley et al.
patent: 5098520 (1992-03-01), Begala
Fallon Thomas C.
Novak Robert W.
Chin Peter
Drake James J.
Miller Robert A.
Nalco Chemical Company
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