Production of paper or paperboard

Details Production of paper or paperboard Production of paper or paperboard

1990-07-03

1991-07-16

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621683, 1621816, 1621818, 162183, D21H 1734

Patent

active

050322273

ABSTRACT:
The fines retention or drainage properties of mechanical pulps in the paper making process are improved by including in the thin stock, not after the last point of high shear, particles of a water-dispersible colloid siliceous material such as a bentonite clay in intimate association with a low molecular weight water soluble high anionic charge density polymer, such as polyacrylic acid having a molecular weight below 50,000 and a charge density of at least 4 m eq/g and further including in the thin stock, after the last point of high shear, a non-ionic high molecular weight polyelectrolyte such as polyacrylamide having a molecular weight of at least 100,000.

REFERENCES:
patent: 4305781 (1981-12-01), Langley et al.
patent: 4445970 (1984-05-01), Post et al.
patent: 4749444 (1988-06-01), Lorz et al.
patent: 4753710 (1988-06-01), Langley et al.

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