D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/14 (2006.01) D21C 9/00 (2006.01)
Patent
CA 2722055
The present invention provides a method for treating lignin-containing fibrous material to reduce its susceptibility to yellowing, comprising stabilizing the lignin of the material with an oxidizing agent capable of oxidizing phenolic or similar groups, which may undergo reactions conductive to the formation of colored sites on the fibers, and treating the material with a fluorescent whitening agent. The present invention also provides a lignin- containing material obtained by said method.
L'invention concerne un procédé qui permet de traiter un matériau fibreux contenant de la lignine afin de réduire sa propension au jaunissement, lequel procédé consiste à stabiliser la lignine du matériau à l'aide d'un agent oxydant capable d'oxyder les groupes phénoliques ou similaires, qui sont susceptibles de subir des réactions conduisant à la formation de plages colorées sur les fibres, et à traiter le matériau à l'aide d'un agent de blanchiment fluorescent. L'invention se rapporte également à un matériau contenant de la lignine obtenu selon ce procédé.
Aksela Reijo
Pere Jaakko
Tauber Andrei
Vuorenpalo Veli-Matti
Gowling Lafleur Henderson Llp
Kemira Oyj
LandOfFree
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