Global Patent Index - EP 0786029 B1

EP 0786029 B1 2000-06-14 - METHOD FOR REMOVAL OF HEXENURONIC ACID GROUPS IN CELLULOSE PULP BY HEAT TREATMENT

Title (en)

METHOD FOR REMOVAL OF HEXENURONIC ACID GROUPS IN CELLULOSE PULP BY HEAT TREATMENT

Title (de)

VERFAHREN ZUM ENTFERNEN VON HEXENURONSÄUREGRUPPEN IN ZELLSTOFFBREI DURCH WÄRMEBEHANDLUNG

Title (fr)

PROCEDE D'ELIMINATION DE GROUPES D'ACIDE HEXENURONIQUE DANS DE LA PATE DE CELLULOSE PAR TRAITEMENT THERMIQUE

Publication

EP 0786029 B1 (EN)

Application

EP 95934164 A

Priority

  • FI 9500566 W
  • FI 944808 A

Abstract (en)

[origin: WO9612063A1] Pulp, in particular hardwood pulps, is delignified in cooking and, when needed, further delignified with oxygen to a kappa number below (24), preferably below (14). The delignified pulp is heated and treated at a temperature of about 85 to 150 DEG C, preferably 90 to 110 DEG C, at a pH of about 2 to 5 in order to decrease the kappa number by 2 to 9 units by removing at least 50 % of the hexenuronic acid groups in the pulp. The treated pulp is bleached in at least one bleaching stage.

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

D21C 9/00; D21C 9/10

IPC 8 full level (invention and additional information)

D21C 9/00 (2006.01); D21C 9/10 (2006.01); D21C 9/14 (2006.01); D21C 9/147 (2006.01)

IPC 8 main group level (invention and additional information)

D21C (2006.01)

CPC (invention and additional information)

D21C 9/001 (2013.01); D21C 9/1005 (2013.01)

Designated contracting state (EPC)

DE ES PT SE

EPO simple patent family

WO 9612063 A1 19960425; AU 3655995 A 19960506; CA 2160430 A1 19960414; CA 2160430 C 20041207; CN 1075143 C 20011121; CN 1168706 A 19971224; DE 69517532 D1 20000720; EP 0786029 A1 19970730; EP 0786029 B1 20000614; ES 2147303 T3 20000901; FI 102301 B1 19981113; FI 102301 B 19981113; FI 944808 A0 19941013; FI 944808 A 19960414; FI 971508 A0 19970410; FI 971508 A 19970410; JP 3534412 B2 20040607; JP H10508346 A 19980818; NO 971682 A 19970611; NO 971682 D0 19970411; NZ 293983 A 19990429; PT 786029 E 20000929; RU 2126862 C1 19990227; SE 518080 C2 20020820; SE 9503595 D0 19951013; SE 9503595 L 19960414; ZA 9508655 B 19960513

INPADOC legal status


2010-10-29 [PGFP PT] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: PT

- Payment date: 20040921

- Year of fee payment: 10

2005-08-30 [REG SE ECNC] EUROPEAN PATENT HAS BEEN CANCELLED

2005-06-30 [REG PT MP4A] REFUSAL OF NATIONAL PROTECTION

- Effective date: 20050420

2005-04-20 [27W] REVOKED

- Effective date: 20050131

2004-10-05 [PGFP ES] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: ES

- Payment date: 20041005

- Year of fee payment: 10

2004-09-23 [PGFP SE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: SE

- Payment date: 20040923

- Year of fee payment: 10

2004-09-21 [PGFP PT] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: PT

- Payment date: 20040921

- Year of fee payment: 10

2002-08-28 [R26] OPPOSITION FILED (CORRECTION)

- Opponent name: KVAERNER PULPING AB * 20010312 DEGUSSA AG * 200103

- Effective date: 20010309

2002-05-29 [RAP2] TRANSFER OF RIGHTS OF AN EP GRANTED PATENT

- Owner name: ANDRITZ OY

2001-05-09 [26] OPPOSITION FILED

- Opponent name: KVAERNER PULPING AB

- Effective date: 20010309

2001-05-09 [26] OPPOSITION FILED

- Opponent name: DEGUSSA AG

- Effective date: 20010312

2001-05-09 [26] OPPOSITION FILED

- Opponent name: METSO PAPER SUNDSVALL AB

- Effective date: 20010314

2001-05-02 [26] OPPOSITION FILED

- Opponent name: KVAERNER PULPING AB

- Effective date: 20010309

2001-05-02 [26] OPPOSITION FILED

- Opponent name: DEGUSSA AG

- Effective date: 20010312

2000-11-10 [EN] FR: TRANSLATION NOT FILED

2000-09-29 [REG PT SC4A] TRANSLATION IS AVAILABLE

- Free text: AVAILABILITY OF NATIONAL TRANSLATION

- Effective date: 20000615

2000-09-15 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: DE

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20000915

2000-09-01 [REG ES FG2A] DEFINITIVE PROTECTION

- Document: ES 2147303 T3

2000-07-20 [REF] CORRESPONDS TO:

- Document: DE 69517532 20000720

2000-06-14 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE ES PT SE

1998-02-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19971229

1997-07-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19970409

1997-07-30 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE ES PT SE