EP 1811080 A1 20070725 - Process for the bleaching of mechanical paper pulp
Title (en)
Process for the bleaching of mechanical paper pulp
Title (de)
Verfahren zum Bleichen von mechanischer Papierpulpe
Title (fr)
Procédé de blanchiment de pate de papier mecanique
Publication
Application
Priority
EP 06075155 A 20060124
Abstract (en)
The invention is related to a process for the bleaching of mechanical paper pulp with one or more peroxide oxidizing agents, in which the pulp is pretreated in a pretreatment step with one or more chelating agents chosen from aspanic acid and its derivatives, substituted nn the nitrogen atom, characterized in that the initial pH ofthe pretreatment step, just before adding the one or more chelating agents, is above 8.
IPC 8 full level
CPC (source: EP US)
D21C 9/1042 (2013.01 - EP US); D21C 9/1005 (2013.01 - EP US); D21C 9/16 (2013.01 - EP US)
Citation (search report)
- [XDY] WO 9730209 A1 19970821 - KEMIRA CHEMICALS OY [FI], et al
- [Y] WO 9927178 A1 19990603 - AMYLUM BELGIUM N V [BE], et al
- [XD] WO 9946441 A1 19990916 - SOLVAY [BE], et al
- [A] WO 9403553 A1 19940217 - PROCTER & GAMBLE [US], et al
- [A] WO 2005108673 A1 20051117 - KEMIRA OYJ [FI], et al
- [A] WO 9745586 A1 19971204 - KEMIRA CHEMICALS OY [FI], et al
- [A] US 6207010 B1 20010327 - GROTH TORSTEN [DE], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1811080 A1 20070725; CA 2636355 A1 20070802; CA 2636355 C 20150929; EP 1979533 A1 20081015; EP 1979533 B1 20160330; PL 1979533 T3 20161031; US 2010163193 A1 20100701; WO 2007085579 A1 20070802
DOCDB simple family (application)
EP 06075155 A 20060124; CA 2636355 A 20070122; EP 07704046 A 20070122; EP 2007050578 W 20070122; PL 07704046 T 20070122; US 16080507 A 20070122