Rope dyeing process using indigo derivative and dyed article...

Details Rope dyeing process using indigo derivative and dyed article... Rope dyeing process using indigo derivative and dyed article...

D - Textiles, Paper

06

P

2/107, 8/13, 8/5

D06P 1/32 (2006.01) C09B 7/04 (2006.01) D06P 1/22 (2006.01)

Patent

CA 2020549

ABSTRACT OF THE DISCLOSURE Disclosed is a dyeing process for rope dyeing denim cotton yarns a fashion blue color which comprises the steps of forming the yarns into a rop; repeatedly immersing the rope in a dye bath containing a reduced water soluble form of a halogenated indigo derivative which is air oxidizable, squeezing the rope to remove dye bath liquid therefrom expos- ing the damp rope air to air to air oxidize the reduced form of the indigo derivative in the yarn; and then further oxi- dizing the incompletely oxidized reduced form of the indigo derivative in the yarn forming the rope in an oxidizing bath containing a chemical oxidant, e.g., sodium perborate.

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