Global Patent Index - EP 0704007 B1

EP 0704007 B1 19971112 - NON-POLLUTING PROCESS FOR INCREASING THE WET STRENGTH OF PAPER

Title (en)

NON-POLLUTING PROCESS FOR INCREASING THE WET STRENGTH OF PAPER

Title (de)

NICHT VERUNREINIGENDES VERFAHREN ZUR VERBESSERUNG DER NASSFESTIGKEIT VON PAPIER

Title (fr)

PROCEDE NON POLLUANT POUR AUGMENTER LA RESISTANCE HUMIDE DU PAPIER

Publication

EP 0704007 B1 19971112 (FR)

Application

EP 94917691 A 19940527

Priority

  • FR 9400626 W 19940527
  • FR 9306904 A 19930609

Abstract (en)

[origin: WO9429523A1] Process for the manufacture of paper which provides a non-polluting method based on ionic lattices for giving wet strength. The process is characterized by successively adding to the fibrous composition a cationic polyelectrolyte, then a sulfonated anionic polyelectrolyte, for example, the acrylamide and acryloxyethyltrimethylammonium chloride copolymer and the acrylamide and 2-acrylamido-2-methylpropane sulfonate copolymer. The polyelectrolytes are used in an amount of 0.02 to 2.5 % by weight in relation to the dry weight mass of the cellulosic composition entering the head box. The process is non-polluting; and no AOX, formaldehyde or epichlorhydrine are produced when it is carried out. The paper formed is easily repulpable.

IPC 1-7

D21H 23/76

IPC 8 full level

D21H 17/37 (2006.01); D21H 17/42 (2006.01); D21H 17/45 (2006.01); D21H 21/20 (2006.01); D21H 23/76 (2006.01)

CPC (source: EP)

D21H 17/37 (2013.01); D21H 17/42 (2013.01); D21H 17/455 (2013.01); D21H 21/20 (2013.01); D21H 23/765 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE

DOCDB simple family (publication)

FR 2706496 A1 19941223; FR 2706496 B1 19960105; AT E160193 T1 19971115; AU 6931394 A 19950103; DE 69406787 D1 19971218; DE 69406787 T2 19980430; EP 0704007 A1 19960403; EP 0704007 B1 19971112; ES 2110759 T3 19980216; PL 172968 B1 19971231; PL 311873 A1 19960318; WO 9429523 A1 19941222

DOCDB simple family (application)

FR 9306904 A 19930609; AT 94917691 T 19940527; AU 6931394 A 19940527; DE 69406787 T 19940527; EP 94917691 A 19940527; ES 94917691 T 19940527; FR 9400626 W 19940527; PL 31187394 A 19940527