Use of DADMAC containing polymers for coated broke treatment

Details Use of DADMAC containing polymers for coated broke treatment Use of DADMAC containing polymers for coated broke treatment

1990-02-26

1992-07-21

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621683, 162191, 162199, 162DIG4, D21H 1745

Patent

active

051319829

ABSTRACT:
DADMAC containing polymers, both homopolymers and copolymers are used in effective coagulating amounts to treat cellulosic fibres recycled from coated broke recovery. The DADMAC containing polymers are either homopolymers or are preferably copolymers containing acrylamide. Recycle of coated broke can cause difficulties when the fibres are recycled to the paper manufacturing process because the coatings contain binders which cause what is referred to as "white pitch", the accumulation of which can cause holes in the paper, build-up of residues and sticky masses, and clogging of felts and the like in the manufacture of paper. The use of the DADMAC polymers eliminates this difficulty in making paper from recycled cellulose fibres ottained from coated broke recycle.

REFERENCES:
patent: 4029885 (1977-06-01), Buikema
patent: 4268352 (1981-05-01), Cosper et al.
patent: 4964955 (1990-10-01), Lamar et al.
Chris Bennett: "Recycling of Fibres and Fillers in the Pulp and Paper Industry" EU-CE-PA/DITP Symposium Ljublajan; 1989, pp. 176-178.
R. W. Hagemeyer: "Pigment Coating"; Pulp and Paper Chemistry and Chemical Technology; 3rd ed.; vol. VI; J. P. Casey, ed.; 1983, pp. 2013-2094.
Pulp and Paper Chemistry and Chemical Technology; 3rd ed.; vol. II; J. P. Casey, ed.; 1980, pp. 825-826.
Karen Edwards: "Wet End Chemical Control Reduces Recycled Coated Stock Problems" Pulp & Paper, vol. 52 (Feb. 1987), pp. 52-54.

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