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
Application
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
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)
- [XY] WO 9506773 A1 19950309 - UNION CAMP PATENT HOLDING [US]
- [Y] DE 2444475 A1 19750417 - PAPIRIND FORSKNINGSINST
- [X] WO 9823811 A1 19980604 - KESKUSLABORATORIO [FI], et al
- [X] US 4283251 A 19810811 - SINGH RUDRA P
- [X] US 5755925 A 19980526 - KOGAN JACK [US], et al
- [X] FR 2695947 A1 19940325 - SAINT GOBAIN PAPIER BOIS GIE C [FR]
- [A] US 6319361 B1 20011120 - SMITH DAVID JAY [US], et al
- [A] US 5698688 A 19971216 - SMITH DAVID JAY [US], et al
- [A] US 5656746 A 19970812 - SMITH DAVID JAY [US], et al
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