Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1988-07-20
1990-05-15
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 1621681, 1621682, 1621683, 1621811, 1621812, 1621818, 162183, D21H 1733
Patent
active
049255304
ABSTRACT:
Aqueous suspensions of papermaking fibres and filler are each separately treated with an anionic or a cationic polymer, after which the filler (preferably) or the papermaking fibre is treated with a polymer of opposite charge to that used in the initial treatment. The filler and papermaking suspensions are then mixed to form a papermaking stock, with dilution as necessary before, during or after the mixing operation. This stock is then used to form a loaded paper web in conventional manner. The initial treating polymer is preferably a papermaking retention aid or flocculant, e.g. a cationic polyarcylamide or an amine/amide/epichlorohydrin copolymer in the case of cationic materials or an anionic polyacrylamide in the case of anionic materials. The further treating polymer is preferably an anionic or cationic starch, depending on the charge of the initial treating polymer.
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Hayes Angela J.
Sinclair Peter
Chin Peter
The Wiggins Teape Group Limited
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