Process for the production of paper
First Claim
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1. 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 acrylamide-based polymer;
(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.
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Abstract
The present invention relates to a drainage and retention aid composition which comprises:
- (d) a first anionic component which is a water-soluble anionic organic polymer;
- (e) a second anionic component which is a water-dispersible or branched anionic organic polymer; and
- (f) a third anionic component which is an anionic siliceous material;
wherein the first, second and third anionic components are present in a dry matter content of from 0.01 to 50% by weight.
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Citations
22 Claims
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1. A process for producing paper which comprises:
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(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 acrylamide-based polymer; (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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for producing paper which comprises:
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(i) providing an aqueous suspension comprising cellulosic fibres, (ii) adding to the suspension after the last point of high shear; (a) a first anionic component which is a water-soluble anionic acrylamide-based polymer; (b) a second anionic component which is a water-dispersible or branched acrylamide-based polymer; (c) a third anionic component which is an anionic silica-based polymer comprising aggregated anionic silica-based particles having a specific surface area within the range of from 50 to 1000 m2/g; (iii) dewatering the obtained suspension to form paper. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification