TREA

Process for the production of paper

Follow

Information

  • Patent Application
  • 20070151688
  • Publication Number
    20070151688
  • Date Filed
    December 20, 2006
    17 years ago
  • Date Published
    July 05, 2007
    17 years ago
Information
Abstract
The present invention relates to a process for producing paper which comprises: providing an aqueous suspension comprising cellulosic fibres, adding to the suspension, after all points of high shear, a cationic polysaccharide; and a polymer P2 being an anionic polymer; and, dewatering the obtained suspension to form paper.
Description
Claims
  • 1. 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 cationic polysaccharide; anda polymer P2 being an anionic polymer; and(iii) dewatering the obtained suspension to form paper.
  • 2. A process according to claim 1 which comprises adding a polymer P1 being a cationic polymer to the suspension after all points of high shear.
  • 3. The process according to claim 1, wherein the cationic polysaccharide is cationic starch.
  • 4. The process according to claim 1, wherein the cationic polysaccharide has a degree of substitution (DSC) within the range of from about 0.005 to about 1.0.
  • 5. The process according to claim 1, wherein the cationic polysaccharide has a cationic charge density within the range of from about 0.05 to about 6.0 meq/g.
  • 6. The process according to claim 1, wherein the cationic polysaccharide has a molecular weight above 500.000.
  • 7. The process according to claim 1, wherein the polymer P2 is an inorganic polymer.
  • 8. The process according to claim 1, wherein the polymer P2 is a silicic acid or silicate based polymer.
  • 9. The process according to claim 1, wherein the polymer P2 comprises colloidal silica-based particles.
  • 10. The process according to claim 1, wherein the polymer P2 is an organic polymer.
  • 11. The process according to 1, wherein the polymer P2 is an acrylamide-based polymer.
  • 12. The process according to claim 2, wherein the polymer P1 is an organic polymer.
  • 13. The process according to claim 2, wherein the polymer P1 is a cationic acrylamide-based polymer.
  • 14. The process according to claim 2, wherein the polymer P1 has a weight average molecular weight of at least about 500,000.
  • 15. The process according to claim 2, wherein the polymer P1 is an inorganic polymer.
  • 16. The process according to claim 2, wherein the polymer P1 is polyaluminium chloride.
Provisional Applications (1)
Number Date Country
60755350 Dec 2005 US