Global Patent Index - EP 1062387 A1

EP 1062387 A1 2000-12-27 - METHOD FOR BLEACHING AND/OR DELIGNIFICATION OF PAPER PULP

Title (en)

METHOD FOR BLEACHING AND/OR DELIGNIFICATION OF PAPER PULP

Title (de)

VERFAHREN ZUM BLEICHEN UND/ODER ZUR DELIGNIFIZIERUNG VON ZELLSTOFF

Title (fr)

PROCEDE DE BLANCHIMENT ET/OU DE DELIGNIFICATION DE PATES A PAPIER

Publication

EP 1062387 A1 (FR)

Application

EP 99914514 A

Priority

  • BE 9800190 A
  • EP 9901612 W

Abstract (en)

[origin: WO9946441A1] The invention concerns a method for bleaching and/or delignification of paper pulp using one or several peroxidized oxidants, which consists in pre-treating the paper pulp to a pH higher than 8 by means of one or several chelating agents selected among aspartic acid and its derivatives substituted on the nitrogen atom.

IPC 1-7 (main, further and additional classification)

D21C 9/10; D21C 9/16

IPC 8 full level (invention and additional information)

D21C 9/10 (2006.01); D21C 9/16 (2006.01)

CPC (invention and additional information)

D21C 9/1042 (2013.01); D21C 9/16 (2013.01)

Citation (search report)

See references of WO 9946441A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9946441 A1 19990916; AU 3330599 A 19990927; BE 1011785 A3 20000111; EP 1062387 A1 20001227; ZA 9901903 B 20001011

INPADOC legal status


2002-04-03 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010720

2001-04-18 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010307

2000-12-27 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001010

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE