Global Patent Index - EP 1316639 A1

EP 1316639 A1 20030604 - Use of ozone for increasing the wet strength of paper and nonwoven

Title (en)

Use of ozone for increasing the wet strength of paper and nonwoven

Title (de)

Die Verwendung von Ozone zur Erhöhung der Nassfestigkeit von Papier und Vliesstoff

Title (fr)

L'utilisation de l'ozone pour augmenter de la resistance humide de papier et de non tissé

Publication

EP 1316639 A1 20030604 (EN)

Application

EP 02026454 A 20021127

Priority

GB 0128735 A 20011130

Abstract (en)

The present invention relates to the use of a treatment sequence comprising ozonation under acidic conditions followed by an acidic wash for enhancing the wet strength of a cellulosic fibrous material, as well as the corresponding process. Preferably the ozone treatment and the acidic wash are followed by a second ozonation step under acidic conditions. The present invention further concerns a fibrous cellulosic material obtainable by this treatment sequence which preferably has a breaking length of at least 100 m. The present invention thus allows increasing the wet strength of a cellulosic fibrous material (e.g. pulp), paper or nonwoven without the use of additives, such as wet strength agents. This use of ozone is very simple and efficient, and leads to highly pure products. The use of ozone as the only treatment chemical in particular avoids the introduction of so-called "non-process elements" (NPE) into the treatment system, for instance metal oxides such as MgO, which are frequently used in the oxidative treatment of pulps.

IPC 1-7

D21C 9/153; D21H 21/20

IPC 8 full level

D21C 9/00 (2006.01); D21C 9/153 (2006.01)

CPC (source: EP)

D21C 9/002 (2013.01); D21C 9/153 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

DOCDB simple family (publication)

EP 1316639 A1 20030604; GB 0128735 D0 20020123; GB 2382592 A 20030604

DOCDB simple family (application)

EP 02026454 A 20021127; GB 0128735 A 20011130