Process for continuous dyeing of poly...

D - Textiles – Paper – 06 – P

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8/31.07

D06P 3/24 (2006.01) D06P 1/90 (2006.01) D06P 1/92 (2006.01)

Patent

CA 1302016

ABSTRACT Continuous dyeing of poly(m-phenyleneiso- phthalamide) fibers using a swelling agent to introduce a dye and optionally a flame retardant into the fiber. The dyed fiber has properties of strength and flame resistance approximating the original undyed fiber and, when a flame retardant is used, greater than that of the untreated fiber. These aramid fibers are conveniently dyed to an unlimited range of colors with high color yield and relatively good lightfastness at a reasonable cost. An aqueous dimethylsulfoxide solution is used as the preferred swelling agent.

537058

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