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Title:
INDIGO DYEING METHOD AND METHOD FOR MAKING INDIGO DYED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2018/003600
Kind Code:
A1
Abstract:
The present invention provides an indigo dyeing method with which it is possible to obtain, by a simple procedure, a desired dyeing density, shade or hue using natural indigo or natural indigo and synthetic indigo. Provided is an indigo dyeing method including: (1) a procedure for dissolving a dyestuff including natural indigo, a hydrosulfite and caustic soda in a warm water and preparing a concentrated dyeing liquid having an oxidation-reduction potential of -1,000 to -800 mV and pH of 13.0-14.5; (2) a procedure for preparing a diluted dyeing liquid including the concentrated dyeing liquid, hydrosulfite and caustic soda and having an oxidation-reduction potential of -700 to -600 mV and pH of 10.5-11.5; (3) a procedure for immersing a material to be dyed in the diluted dyeing liquid; (4) a procedure for supplying water to the diluted dyeing liquid in which the material to be dyed is immersed until the oxidation-reduction potential becomes -550 to -450 mV; (5) a procedure for immersing the material to be dyed in a treatment liquid that includes acid and hydrogen peroxide after the procedure (4); and (6) a procedure for immersing the material to be dyed in a treatment liquid that includes a soaping agent after the procedure (5).

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Inventors:
TANIMOTO HIROYUKI (JP)
Application Number:
PCT/JP2017/022669
Publication Date:
January 04, 2018
Filing Date:
June 20, 2017
Export Citation:
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Assignee:
MITSUBISHI CORP FASHION CO LTD (JP)
International Classes:
D06P1/34; D06P1/22
Foreign References:
JPH10237341A1998-09-08
JPH01168980A1989-07-04
JP2009191430A2009-08-27
JPS54106580A1979-08-21
JPS61225384A1986-10-07
Attorney, Agent or Firm:
OHNO Seiji et al. (JP)
Download PDF:
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