A method of dyeing a substrate with a reactive dyestuff in...

D - Textiles – Paper – 06 – P

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D06P 1/94 (2006.01) D06M 23/10 (2006.01) D06P 1/00 (2006.01) D06P 1/38 (2006.01) D06P 3/54 (2006.01) D06P 3/66 (2006.01)

Patent

CA 2586450

The present invention relates to a method of dyeing a substrate with a reactive dyestuff in supercritical or near supercritical carbon dioxide, said substrate being selected from the group consisting of cellulose fibres, modified cellulose fibres, protein fibres and of synthetic fibres, or any combination thereof, wherein the method comprises the subsequent steps of: pre- treating the substrate by wetting the substrate with a fluid medium containing at least 10 wt.%, preferably at least 40 wt.% of one or more organic hydrogen bond acceptor compounds selected from the group consisting of C1-C6 alkano ls, dimethyl sulfoxide, dimethylformamide, acetone, butan-2-one, dimethyl ether, methyl acetate and ethyl acetate; dyeing the substrate by contacting the pre- treated substrate with supercritical or near supercritical carbon dioxide containing a reactive dyestuff.

L'invention concerne un procédé permettant de teindre un substrat au moyen d'un colorant réactif dans un dioxyde de carbone supercritique ou quasi supercritique, ledit substrat étant choisi dans le groupe constitué par les fibres cellulosiques, les fibres cellulosiques modifiées, les fibres à base de protéines, les fibres synthétiques, et des combinaisons de celles-ci. Les étapes successives de ce procédé consistent à prétraiter le substrat en l'humidifiant avec un milieu fluide contenant au moins 10 % en poids, et de préférence au moins 40 % en poids, d'un ou de plusieurs composés organiques accepteurs de liaison hydrogène, choisis dans le groupe constitué par les alcanols C1-C6, diméthylsulfoxyde, diméthylformamide, acétone, butan-2-one, diméthyléther, méthylacétate et éthylacétate; à teindre le substrat en mettant en contact le substrat prétraité avec du dioxyde de carbone à l'état supercritique ou quasi supercritique contenant un colorant réactif.

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