EP 0989224 A1 20000329 - Lyocell bleaching process
Title (en)
Lyocell bleaching process
Title (de)
Verfahren zum Bleichen von Lyocellfasern
Title (fr)
Procédé de blanchiment aux fibres Lyocell
Publication
Application
Priority
GB 9820448 A 19980921
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
IPC 8 full level
D06L 3/02 (2006.01); D06L 4/10 (2017.01); D06L 4/12 (2017.01); D06L 4/13 (2017.01); D06L 4/15 (2017.01)
CPC (source: EP)
D06L 4/10 (2016.12); D06L 4/12 (2016.12); D06L 4/13 (2016.12); D06L 4/15 (2016.12); D06M 13/358 (2013.01); D06M 2200/35 (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 World Patents Index; 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
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99307425 A 19990920; GB 9820448 A 19980921