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US 2006/0130991 A1Published application
Process for the production of paper
AssigneeAkzo Nobel N.V.
InventorsFredrik Solhage, Joakim Carlen, Birgitta Johansson
Life of this patent
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Abstract
The present invention relates to a process for producing paper which comprises: (vii) providing an aqueous suspension comprising cellulosic fibres, (viii) adding to the suspension after all points of high shear: a first polymer being a cationic polymer having a charge density above 2.5 meq/g; a second polymer; and a third polymer being an organic or inorganic anionic polymer; and (ix) dewatering the obtained suspension to form paper.
Claims36
A process for producing paper which comprises:
- (iv) providing an aqueous suspension comprising cellulosic fibres,
- (v) adding to the suspension after all points of high shear:
- a first polymer being a cationic polymer having a charge density above 4.0 meq/g;
- a second polymer having a molecular weight above 500,000;
- and
- a third polymer being an anionic polymer;
- and
- (vi) dewatering the obtained suspension to form paper.
5 more elements
A process for producing paper which comprises:
- (iv) providing an aqueous suspension comprising cellulosic fibres,
- (v) adding to the suspension after all points of high shear:
- a first polymer being a cationic acrylamide-based polymer having a charge density above 2.5 meq/g;
- a second polymer being an acrylamide-based polymer having a molecular weight above 500,000;
- and
- a third polymer being an anionic polymer;
- and
- (vi) dewatering the obtained suspension to form paper.
5 more elements
A process for producing paper which comprises:
- (i) providing an aqueous suspension comprising cellulosic fibres,
- (ii) adding to the suspension after all points of high shear:
- a first polymer being a cationic polymer having a charge density above 2.5 meq/g;
- a second polymer being a water-dispersible polymer;
- and
- a third polymer being an anionic polymer;
- and
- (iii) dewatering the obtained suspension to form paper.
5 more elements
Dependencies are inferred from the claim text.