Global patent index - EP 0989224 A1

EP 0989224 A1 2000-03-29 - Lyocell bleaching process

Title (en)

Lyocell bleaching process

Title (de)

Verfahren zum Bleichen von Lyocellfasern

Title (fr)

Procédé de blanchiment aux fibres Lyocell

Publication

EP 0989224 A1 (EN)

Application

EP 99307425 A

Priority

GB 9820448 A

Abstract (en)

Lyocell which has been cross-linked with a nitrogen containing compound to reduce the tendency of the lyocell to fibrillate is bleached with an oxygen bleaching composition which comprises peracetic acid or its anion. Advantageously the composition comprises a major part of hydrogen peroxide and a minor part of peracetic acid or its anion, thereby combining the strong oxidising capability of peracetic acid with the ability to produce good bleaching under alkaline conditions. The peracetic acid may be generated by reacting an acetyl donating bleach activator such as tetraethylene diamine with excess hydrogen peroxide.

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

D06L 3/02

IPC 8 full level (invention and additional information)

D06L 3/02 (2006.01)

CPC (invention and additional information)

D06L 3/02 (2013.01)

Citation (search report)

  • [A] EP 0584710 A2 19940302 - HOECHST AG [DE]
  • [A] GB 901687 A 19620725 - TEXTIL GES M B H
  • [A] OLIP, VINZENZ: "Bleiche von Geweben : Ein Vergleich zwischen Baumwolle, Modal- und Lyocell-Fasern", LEZINGER BERICHTE, vol. 75, no. 96, 1995, pages 77 - 79, XP000866000
  • [A] DATABASE WPI Section Ch Week 199822, Derwent Publications Ltd., London, GB; Class F06, AN 1998-245814, XP002126813

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

EP 0989224 A1 20000329; GB 9820448 D0 19981111

INPADOC legal status

2000-11-29 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20001002

2000-11-08 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000909

2000-03-29 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

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

2000-03-29 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI