Process for the application of dye fixing agents to...

Details Process for the application of dye fixing agents to... Process for the application of dye fixing agents to...

D - Textiles, Paper

06

P

D06P 3/24 (2006.01) D06P 1/00 (2006.01) D06P 1/52 (2006.01) D06P 1/56 (2006.01) D06P 1/651 (2006.01) D06P 5/08 (2006.01)

Patent

CA 2162842

A process for increasing the washfastness of a fibrous article containing polyamide fibers dyed with anionic dye by treatment with an anionic dye fixing agent. The process includes immersing the article in a liquid bath of either an aqueous or substantially nonaqueous solvent medium for the fixing agent and heating to a temperature at least equal to the dyeing transition temperature of the fiber. The fixing agent is added to the bath so that the rate of fixing agent addition to the bath is the primary control over the rate of fixing uptake by the article at the early stages of aftertreating. In the later stages, the rate of fixing agent addition controls the concentration in the bath whereby the propensity for the fixing agent to agglommerate from the bath is decreased.

Procédé permettant de renforcer la résistance au lavage d'un article fibreux renfermant des fibres polyamides teintées par un colorant anionique grâce au traitement au moyen d'un agent fixateur de colorant anionique. Le procédé consiste à tremper l'article dans un bain liquide consistant en un milieu solvant aqueux ou essentiellement non aqueux pour l'agent fixateur et à porter ce bain à une température au moins égale à la température de transition de coloration de la fibre. L'agent fixateur est ajouté dans le bain à un débit tel que cette addition constitue la principale régulation de la vitesse d'absorption par l'article au cours des premières étapes du traitement subséquent. Au cours des étapes ultérieures, le débit d'addition de l'agent fixateur permet de réguler la concentration dans le bain tandis que la propension de l'agent fixateur à s'agglomérer décroît.

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