EP 0899373 A1 19990303 - Method of whitening lignin-containing pulp during manufacture
Title (en)
Method of whitening lignin-containing pulp during manufacture
Title (de)
Verfahren zur Erhöhung des Weissgrades eines Lignin enthaltenden Zellstoffs bei seiner Herstellung
Title (fr)
Procédé pour le blanchiment durant la fabrication de pâte à papier contenant de la lignine
Publication
Application
Priority
US 91954997 A 19970828
Abstract (en)
A process to increase the whiteness of a lignin-containing pulp is disclosed which comprises adding to an aqueous slurry comprising a lignin-containing pulp, during pulp manufacture, a fluorescent whitening agent and optionally a chelating agent.
IPC 1-7
IPC 8 full level
D21C 9/00 (2006.01); D21C 9/10 (2006.01); D21H 21/30 (2006.01)
CPC (source: EP KR)
D21C 9/005 (2013.01 - EP KR); D21C 9/1063 (2013.01 - EP KR); D21H 21/30 (2013.01 - EP KR)
Citation (search report)
- [X] GB 2026054 A 19800130 - CIBA GEIGY AG
- [X] US 2924549 A 19600209 - CASPAR KLEIN, et al
- [X] EP 0280332 A1 19880831 - MO OCH DOMSJOE AB [SE]
- [PX] EP 0835906 A2 19980415 - CIBA GEIGY AG [CH]
- [X] DATABASE WPI Section Ch Week 9621, Derwent World Patents Index; Class E23, AN 96-206129, XP002089161
Designated contracting state (EPC)
AT BE CH DE ES FI FR GB IT LI NL PT SE
DOCDB simple family (publication)
EP 0899373 A1 19990303; AU 739524 B2 20011018; AU 8195298 A 19990311; BR 9803764 A 20020514; CA 2245966 A1 19990228; CN 1211655 A 19990324; ID 21054 A 19990408; JP H11124783 A 19990511; KR 19990023911 A 19990325; ZA 987782 B 19990301
DOCDB simple family (application)
EP 98810809 A 19980819; AU 8195298 A 19980827; BR 9803764 A 19980827; CA 2245966 A 19980826; CN 98118493 A 19980827; ID 981160 A 19980824; JP 24289198 A 19980828; KR 19980034765 A 19980827; ZA 987782 A 19980827