Patent ID: 6497731
Filing Date: 2002-12-24
Classification: D06P,Y10S

Abstract:
A method of making improved colorfast articles having dyed polyamide 6 fibers comprising:(i) bringing an article comprising undyed polyamide 6 fibers into contact with a dyebath comprising an amount of dye sufficient to impart color to the polyamide 6 fibers in the article at a dyebath temperature of between about 70Â° C. to about 80Â° C. and for a time sufficient to allow substantially maximum exhaustion of at least about 75% to about 100% uptake of the dye in the dyebath to the article; and then (ii) subjecting the article to an aftertreatment bath comprising acid dye fixing agents at an aftertreatment bath temperature of about 50Â° C. or lower.