EP 0943036 A1 19990922 - METHOD FOR MAKING WET STRENGTH PAPER
Title (en)
METHOD FOR MAKING WET STRENGTH PAPER
Title (de)
VERFAHREN ZUR HERSTELLUNG VON NASSFESTPAPIER
Title (fr)
PROCEDE DE FABRICATION DE PAPIER RESISTANT A L'ETAT HUMIDE
Publication
Application
Priority
- US 9721414 W 19971125
- US 76033196 A 19961204
Abstract (en)
[origin: WO9824974A1] The invention is a method for improving the efficiency of aqueous cationic wet strength additives by pretreating cellulose surfaces with reactive anionic compounds, thus providing the cellulose surface with additional anionic sites suitable for retaining a high proportion of said cationic wet strength additives on the cellulose. The wet strength additives on the cellulose surface are cured or reacted with the cellulose surface. The resulting fibrous material has unusually high wet strength with unusually low doses of cationic wet strength additive. The preferred reactive anionic compounds comprise compounds having a reactive group suitable for covalent bonding to hydroxyl groups on cellulose, and further having sulfonic or other anionic end groups capable of attracting cationic wet strength compounds in aqueous solution.
IPC 1-7
IPC 8 full level
D21H 21/20 (2006.01); D21H 23/10 (2006.01); D21H 17/07 (2006.01); D21H 17/09 (2006.01); D21H 17/54 (2006.01)
CPC (source: EP KR)
D21H 21/20 (2013.01 - EP); D21H 23/10 (2013.01 - EP KR); D21H 17/07 (2013.01 - EP); D21H 17/09 (2013.01 - EP); D21H 17/54 (2013.01 - EP)
Citation (search report)
See references of WO 9824974A1
Designated contracting state (EPC)
BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
WO 9824974 A1 19980611; AU 5360698 A 19980629; AU 729194 B2 20010125; BR 9713842 A 20001031; CA 2271384 A1 19980611; CN 1240010 A 19991229; EP 0943036 A1 19990922; ID 22290 A 19990930; JP 2001505627 A 20010424; KR 20000069273 A 20001125; NZ 336391 A 20000929
DOCDB simple family (application)
US 9721414 W 19971125; AU 5360698 A 19971125; BR 9713842 A 19971125; CA 2271384 A 19971125; CN 97180292 A 19971125; EP 97950660 A 19971125; ID 990444 A 19971125; JP 52562898 A 19971125; KR 19997004895 A 19990603; NZ 33639197 A 19971125