EP 2128331 A1 20091202 - Process for the bleaching of paper pulp
Title (en)
Process for the bleaching of paper pulp
Title (de)
Verfahren zum Bleichen von Papierzellstoff
Title (fr)
Processus de blanchiment de pâte à papier
Publication
Application
Priority
EP 08156934 A 20080526
Abstract (en)
Process for the bleaching of paper pulp in which an aqueous suspension of paper pulp is subjected to a bleaching treatment with hydrogen peroxide in the presence of magnesium hydroxide and of at least one poly-±-hydroxyacrylic acid, its salt or their mixture.
IPC 8 full level
D21C 9/16 (2006.01)
CPC (source: EP US)
D21C 9/163 (2013.01 - EP US); D21C 9/1036 (2013.01 - EP US); D21C 9/1042 (2013.01 - EP US)
Citation (applicant)
- US 6221209 B1 20010424 - DESPREZ FRANCOIS [BE], et al
- US 7052578 B2 20060530 - WAJER MARK T [US], et al
- EP 2008052056 W 20080220
Citation (search report)
- [X] DE 19614587 A1 19971016 - JASCHINSKI THOMAS DIPL HOLZW [DE]
- [X] EP 0814193 A2 19971229 - NIPPON PEROXIDE CO LTD [JP]
- [A] US 2005217813 A1 20051006 - SHEVCHENKO SERGEY M [US], et al
- [A] EP 0801169 A1 19971015 - ATOCHEM ELF SA [FR]
- [A] WO 2005108673 A1 20051117 - KEMIRA OYJ [FI], et al
- [AD] US 2001050153 A1 20011213 - WAJER MARK T [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
EP 2128331 A1 20091202; CA 2723311 A1 20091203; EP 2286024 A1 20110223; US 2011067831 A1 20110324; WO 2009144190 A1 20091203
DOCDB simple family (application)
EP 08156934 A 20080526; CA 2723311 A 20090525; EP 09753845 A 20090525; EP 2009056278 W 20090525; US 99231609 A 20090525