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PAPER AND PAPERBOARD PRODUCTION PROCESS AND CORRESPONDING NOVEL RETENTION AND DRAINAGE AIDS, AND PAPERS AND PAPERBOARDS THUS OBTAINED

  • US 20090283232A1
  • Filed: 07/28/2009
  • Published: 11/19/2009
  • Est. Priority Date: 06/04/1998
  • Status: Abandoned Application
First Claim
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1. Process for manufacturing a sheet of paper or paperboard having improved retention and drainage properties comprising the step of:

  • utilizing a dual system of (a) an acrylic polymer as a primary retention agent and (b) bentonite as a secondary retention agent, the introductions of which are separated by a step for shearing a suspension or fibrous mass or paper pulp,wherein said acrylic polymer is a branched, cationic, acrylic (co)polymer prepared in the form of a reverse phase water-in-oil emulsion, used either in emulsion reversed in water, or in a solution of the powder obtained by drying the emulsion, andwherein the branched, cationic, acrylic (co)polymer prepared in the form of a reverse phase water-in-oil emulsion has a UL viscosity that is greater than 3 cps.

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