D - Textiles – Paper – 06 – P
Patent
D - Textiles, Paper
06
P
D06P 1/30 (2006.01) D06P 1/382 (2006.01) D06P 1/384 (2006.01) D06P 3/24 (2006.01)
Patent
CA 2057576
ABSTRACT The invention is a process for dyeing polyamide substrates comprising anionic and cationic fibers in multi- colored patterns. Cross-staining or dyeing of the cationic fibers by the anionic-dyeable nylon colorant is avoided. The anionic dyeable fiber portion is dyed with a fiber- reactive vinyl sulfone dye having one or more sulfonic acid substituents and one or more vinyl sulfone groups with the proviso that the sum of the number of sulfonic acid and vinyl sulfone substituents is at least three. The dyeing process is conducted at a pH of about 2 to about 4. Optionally the cationic portion of the substrate may be dyed with a basic dye in admixture with the vinyl sulfone dye.
Bereskin & Parr
Hoechst Celanese Corporation
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