Process for the production of paper
AssigneeAkzo Nobel N.V.
InventorsJohan NYANDER, Fredrik SOLHAGE
Life of this patent
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Abstract
The present invention relates to a process for producing paper which comprises: (i) providing an aqueous suspension comprising cellulosic fibres, (ii) adding to the suspension after the last point of high shear subsequent a centri-screen: (a) a first anionic component which is a water-soluble anionic anionic polysaccharide; (b) a second anionic component which is a water-dispersible or branched acrylamide-based polymer; and (c) a third anionic component which is an anionic siliceous material comprising an anionic silica-based polymer comprising anionic silica-based particles having a specific surface area within the range of from 100 to 1700 m2/g (iii) dewatering the obtained suspension to form paper.
Claims15
-33. (canceled)
A process for producing paper which comprises:
- (i) providing an aqueous suspension comprising cellulosic fibres,
- (ii) adding to the suspension after the last point of high shear and subsequent a centri-screen:
- (a) a first anionic component which is a water-soluble anionic polysaccharide;
- (b) a second anionic component which is a water-dispersible or branched acrylamide-based polymer;
- (c) a third anionic component which is an anionic siliceous material comprising an anionic silica-based polymer comprising anionic silica-based particles having a specific surface area within the range of from 100 to 1700 m2/g;
- (iii) dewatering the obtained suspension to form paper.
Dependencies are inferred from the claim text.