Bleaching and dyeing; fluid treatment and chemical modification – Multiple chemically diverse fibers or fibers with different... – Synthetic polyamide
Patent
1994-03-28
1995-08-29
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Multiple chemically diverse fibers or fibers with different...
Synthetic polyamide
8543, 8549, 8633, 8924, D06P 310, D06P 382, C09B 6200
Patent
active
054456533
ABSTRACT:
A method of dyeing nylon, particularly cationic dyeable Type 6 and 66 nylon and light dyeable Type 66 nylon, so that the dyed fiber will resist taking on further dye and will have a high degree of wash and bleed fastness when the dyed fiber is subjected to a further high temperature aqueous dye bath. The method includes providing a bifunctional dye solution having a very low pH, i.e. no higher than 1.5. The dye is applied to the fiber with a degree of wet pick-up exceeding 100% by weight of the fiber. The fiber is then steamed, washed, and dried, and contacted by an alkaline solution, such as a trisodium phosphate solution. Thereafter, the fiber is autoclaved. Such a dyed nylon fiber can be combined with an undyed nylon fiber to produce a textile product. When such a product is subjected to a dyeing operation, to provide the undyed nylon with a color different from the color of the previously-dyed fiber, the previously-dyed fiber will not bleed or wash out, and will resist taking on the dye being used to color the undyed nylon.
REFERENCES:
patent: 4693725 (1987-09-01), Yamauchi et al.
patent: 5131918 (1992-07-01), Kelley
Hixson Robert R.
Rawlston Randy J.
Sweatman Hobert C.
Einsmann Margaret
Lieberman Paul
Rossville Yarn, Inc.
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