Global Patent Index - EP 0877120 B1

EP 0877120 B1 2000-03-22 - PAPERMAKING PROCESS

Title (en)

PAPERMAKING PROCESS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON PAPIER

Title (fr)

PROCEDE DE FABRICATION DE PAPIER

Publication

EP 0877120 B1 (EN)

Application

EP 96942614 A

Priority

  • JP 9603748 W
  • JP 35003595 A
  • JP 1925096 A
  • JP 26377496 A

Abstract (en)

[origin: WO9723691A1] A papermaking process comprising the steps of: adding, to pulp for papermaking in the step of transforming pulp into paper in papermaking, an ionic water-soluble polymer prepared by a method wherein polymerization is conducted in an aqueous salt solution capable of dissolving monomers and incapable of dissolving the resultant polymer in the presence of a dispersant comprising a polyelectrolyte soluble in this aqueous salt solution while stirring to prepare a dispersion of fine polymer particles; and adding an anionic additive selected among anionic colloidal silica, anionic (co)polymers, bentonite, and mixtures thereof, thereby improving the yield and/or drainage rate. This process can markedly improve the yield of raw material/filler and the drainage rate, realizing a high quality and a high productivity.

IPC 1-7 (main, further and additional classification)

D21H 17/45; D21H 23/76

IPC 8 full level (invention and additional information)

D21H 21/10 (2006.01)

CPC (invention and additional information)

D21H 21/10 (2013.01)

Designated contracting state (EPC)

AT BE CH DE ES FI FR GB IT LI NL PT SE

EPO simple patent family

WO 9723691 A1 19970703; AT 191026 T 20000415; AU 2011897 A 19970717; CN 1081705 C 20020327; CN 1205756 A 19990120; DE 69607394 D1 20000427; DE 69607394 T2 20000727; DE 69607394 T3 20070201; EP 0877120 A1 19981111; EP 0877120 A4 19990303; EP 0877120 B1 20000322; EP 0877120 B2 20060621; ES 2146920 T3 20000816; ES 2146920 T5 20070201; PT 877120 E 20000831; TW 342418 B 19981011

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