Global Patent Index - EP 0580529 A1

EP 0580529 A1 19940126 - Process for making paper or cardboard having improved retention.

Title (en)

Process for making paper or cardboard having improved retention.

Title (de)

Verfahren zur Herstellung von Papier oder Pappe mit einer verbesserten Retention.

Title (fr)

Procédé pour la fabrication d'un papier ou d'un carton à rétention améliorée.

Publication

EP 0580529 A1 19940126 (FR)

Application

EP 93420302 A 19930715

Priority

FR 9209211 A 19920721

Abstract (en)

Process for making paper or cardboard having improved retention, in which a polyacrylamide and bentonite are added to the fibrous suspension, characterised in that the polyacrylamide is an amphoteric linear terpolymer and is introduced into the fibrous suspension in the form of a dissolved powder, in a proportion of 0.03 to 1.0 per thousand (0.03 to 1.0 %o), by weight, of the dry weight of the fibrous suspension.

Abstract (fr)

Procédé pour la fabrication d'un papier ou d'un carton à rétention améliorée, dans lequel on ajoute à la suspension fibreuse un polyacrylamide et de la bentonite, caractérisé en ce que le polyacrylamide est un terpolymère linéaire amphotère, et est introduit dans la suspension fibreuse sous forme de poudre mise en solution, à raison de 0,03 à 1,0 pour mille (0,03 à 1,0 %o) en poids, du poids sec de la suspension fibreuse.

IPC 1-7

D21H 21/10; D21H 17/37; D21H 17/68; D21H 17/45

IPC 8 full level

D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 17/68 (2006.01); D21H 21/10 (2006.01)

CPC (source: EP)

D21H 17/375 (2013.01); D21H 17/455 (2013.01); D21H 17/68 (2013.01); D21H 21/10 (2013.01)

Citation (search report)

  • [AD] EP 0017353 A1 19801015 - ALLIED COLLOIDS LTD [GB]
  • [AD] US 3052595 A 19620904 - PYE DAVID J
  • [AD] EP 0235893 A1 19870909 - ALLIED COLLOIDS LTD [GB]
  • [A] ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY vol. 62, no. 10, Avril 1992, ATLANTA US page 1165 KAJASVIRTA, R. 'Supercoagulation in the control of wet-end chemistry by synthetic polymer and activated bentonite'

Designated contracting state (EPC)

DE GB IT SE

DOCDB simple family (publication)

EP 0580529 A1 19940126; EP 0580529 B1 19960417; DE 69302238 D1 19960523; DE 69302238 T2 19961010; FR 2694027 A1 19940128; FR 2694027 B1 19940826

DOCDB simple family (application)

EP 93420302 A 19930715; DE 69302238 T 19930715; FR 9209211 A 19920721