Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1996-07-08
1999-01-12
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 1621681, 1621682, 1621683, 162175, 1621811, 1621814, 1621816, 1621818, 1621815, 162183, D21H 2110
Patent
active
058581740
ABSTRACT:
The invention relates to a process for the production of paper from a suspension of cellulose containing fibers, and optional fillers, comprising adding to the suspension a low molecular weight cationic organic polymer, a high molecular weight cationic or amphoteric polymer and anionic inorganic particles, forming and draining the suspension on a wire, wherein the low molecular weight polymer has a molecular weight below 700,000 and the high molecular weight polymer has a molecular weight above 1,000,000, said polymers being simultaneously added to the suspension. The invention further relates to a polymer mixture in the form of an aqueous dispersion comprising at least one high molecular weight cationic or amphoteric acrylamide-based polymer having a molecular weight above 1,000,000, at least one low molecular weight cationic organic polymer having a molecular weight below 700,000 and at least one water-soluble inorganic salt, the weight ratio of said high molecular weight polymer to said low molecular weight polymer being within the range of from 9:1 to 1:2.
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Carlen Joakim
Cordoba Carlos
Johansson Hans
Persson Michael
Chin Peter
Eka Chemicals AB
Mancini Ralph J.
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