US2003928A - Stripping and discharging dyed textiles - Google Patents

Stripping and discharging dyed textiles Download PDF

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Publication number
US2003928A
US2003928A US66118033A US2003928A US 2003928 A US2003928 A US 2003928A US 66118033 A US66118033 A US 66118033A US 2003928 A US2003928 A US 2003928A
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United States
Prior art keywords
stripping
parts
dyed
azoic
colours
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Expired - Lifetime
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English (en)
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Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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Publication of US2003928A publication Critical patent/US2003928A/en
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Classifications

    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06PDYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/13Fugitive dyeing or stripping dyes
    • D06P5/138Fugitive dyeing or stripping dyes fugitive dyeing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S516/00Colloid systems and wetting agents; subcombinations thereof; processes of
    • Y10S516/01Wetting, emulsifying, dispersing, or stabilizing agents
    • Y10S516/07Organic amine, amide, or n-base containing

Definitions

  • Dyeings of the so-called azoic colours that is, of those azo dyestuffs produced by combination on the fibre, are, as is well known, generally fast, and many are extremely fast to bleaching agencies.
  • the outstanding fastness to kier-boiling and chlorine of such dyeings is evidence of this.. It often becomes necessary, nevertheless, to remove the dyestu'ff from the fabric because of faults in the dyeing, or for other reasons, and, although this removal, or discharge, is comparatively easily carried out locally, as in discharge printing processes, it is carried out only with difficulty, and at a prohibitive cost (due to the necessity of using excessive amounts of stripping agents), when a solid shade is to be entirely removed.
  • An object of this invention relates to the provision of a technically advantageous, economical process of stripping and discharging, particularly adapted to the entire removal of solid shades. Other objects will appear hereinafter.
  • a chemically reducing liquor which may be acid, alkaline or neutral, containing an amine or amine salt, preferably a quaternary ammonium salt, a radical which contains not less than 10 carbon atoms.
  • the liquor may be either weakly alkaline, neutral or weakly acid, but is preferably acid when the amine is not a quaternary ammonium salt.
  • azoic dyeings on wool or silk or other animal fibre can be stripped. satisfactorily in an alkaline bath, a certain risk is incurred owing to the possibility of injury to the fibre on account of the alkali present, it is therefore preferable to treat such fibres in a faintly acid bath.
  • vegetable fibre can be treated in the same manner.
  • the acidity may be produced by means of mineral or organic acid.
  • the fibre is stripped white or slightly tinged. In the latter case, for vegetable fibre, a supplementary chlorine or chemick treatment may be applied further to improve the ground. In the case of animal fibre a supplementary peroxide treatment is sometimes beneficial.
  • Suitable amines or amine salts are for example p-diethylaminoethyloleyl amide or its acetate or hydrochloride, heptadecylamine or its hydrochloride and suitable quaternary ammonium salts are, for example, octadecylpyridim'um bromide, cetylpyridinium bromide (cf. British specification No. 379,396), cetylpyridinium chloride (of. British specification No. 392,763), octadecyltrimethylammonium iodide (Reychler, Journ.
  • the textile material is then found to be colourless, or at least to have but a yellow tinge. may be made perfectly white by a further treatment, if necessary in a weak solution of sodium hypochlorite or other chlorine bleach liquor.
  • Example 1 Cotton dyed with the 4-br0mo-oanisidide of 2:3-hydroxynaphthoic acid coupled with diazotized 4-chloro-o-toluidine is treated with a boiling solution containing 0.2 parts of sodium hydrosulphite, 0.1 parts sodium carbonate and 0.25 parts of fi-hydroxyethyl-N-octadecylmorpholinium bromide in 100 parts of water for 10 minutes. The dyeing is stripped to a pale yellow which can be cleared by a mild treatment with chlorine.
  • Example 2 The process is carried out exactly as in Example 1 but using octadecylpyridinium bromide in place of fi-hydroxyethyl-N-octadecylmorpholinium bromide.
  • Example 32.5 parts cotton dyed with the 4- bromo-o-anisidide of 2:3-hydroxynaphthoic acid coupled with diazotized 5-chloro-o-toluid'ine is treated with a boiling solution containing 0.4 parts sodium formaldehyde sulphoxylate, 0.2 parts acetic acid 30% and 0.2 parts cetyltrimethylammonium bromide in 100 parts watr for 30 minutes.
  • the dyeing is stripped to a pale yellow, which can be cleared by a mild treatment with chlorine.
  • cetyltrimethylammonium bromide there may be used an equal quantity of cetylpyridinium bromide.
  • Example 425 parts natural silk which has previously been degummed and dyed with the 4-bromo-o-anisidide of 2:3-hydroxynaphthoic acid coupled with diazotized 4-chloro-o-toluidine is treated for 30 minutes at -95 C. in a solution containing 0.4 parts sodium formaldehyde sulphoxylate, 0.2 parts acetic acid 30% and 0.2 parts cetyltrimethylammonium bromide. The dyeing is stripped from a deep red to pale yellow.
  • the two preceding examples refer to stripping in an acid reducing bath.
  • the following example illustrates the stripping action in a neutral bath.
  • Example 5 2.5 parts cotton dyed with the -chloro-o-toluidide of 2:3-hydroxynaphthoic acid coupled with diazotized 4-chloro-o-toluidine is treated with a boiling neutralized solution containing 0.4 parts sodium formaldehyde sulphoxylate and 0.2 parts cetyltrimethylammonium bromide in 100 parts of water for 30 minutes. The neutralization of the solution is effected by the addition of a small amount of acetic acid. The dyeing is completely stripped.
  • Example 6.2.5 parts of material dyed with the anilide of 2:3-hydroxynaphthoic acid coupled with diazotized 5-amino-6-benzoylamino-4- methoxy-toluene is boiled for 1 hour in 100 parts of an aqueous solution containing 0.2 parts of sodium sulphoxylate formaldehyde, 0.2 parts of acetic acid (30%) and 0.2 parts of fi-diethylaminoethyloleylamide acetate.
  • the material is stripped to a white with a tinge of yellow which can be converted to a perfect white by treatment for 5 minutes in a Tw. chemick solution.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them with a chemically reducing liquor containing a substance selected from the group consisting of amines and amine salts having an aliphatic radical which contains not less than ten carbon atoms.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a chemically reducing liquor containing a cetyltrialkylammonium salt.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a chemically reducing liquor containing a cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a hot dilute chemically reducing liquor containing cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them with an alkaline chemically reducing liquor containing a quaternary ammonium salt one radical in which contains not less than carbon atoms.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in an alkaline chemically reducing liquor containing a cetyltrialkylammonium salt.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in an alkaline chemically reducing liquor containing a cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a hot dilute alkaline chemically reducing liquor containing cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them with an acid chemically reducing liquor containing a quaternary ammonium salt one radical in which contains not less than 10 carbon atoms.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in an acid chemically reducing liquor containing a cetyltrialkylammonium salt.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in an acid chemically reducing liquor containing cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a hot dilute acid chemically reducing liquor containing cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them with a neutral chemically reducing liquor containing a quaternary ammonium salt one radical in which contains not less than 10 carbon atoms.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a neutral chemically reducing liquor containing a cetyltrialkylammonium salt.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a neutral chemically reducing liquor containing cetyltrimethylammonium bromide.
  • a process for stripping textile materials dyed with azoic colours which comprises treating them in a hot dilute neutral chemically reducing liquor containing cetyltrimethylammonium bromide.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coloring (AREA)
US66118033 1932-03-19 1933-03-16 Stripping and discharging dyed textiles Expired - Lifetime US2003928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8238/32A GB400239A (en) 1932-03-19 1932-03-19 Improvements in stripping dyed textiles

Publications (1)

Publication Number Publication Date
US2003928A true US2003928A (en) 1935-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US66118033 Expired - Lifetime US2003928A (en) 1932-03-19 1933-03-16 Stripping and discharging dyed textiles

Country Status (4)

Country Link
US (1) US2003928A (fr)
DE (1) DE605913C (fr)
FR (1) FR752728A (fr)
GB (1) GB400239A (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548914A (en) * 1951-04-17 Color and stain removers for
US2549079A (en) * 1951-04-17 Color and stain removers for
US2549113A (en) * 1951-04-17 Color and stain removers for
US2548892A (en) * 1951-04-17 Color and stain removers for
US2587597A (en) * 1949-07-14 1952-03-04 Arkansas Company Inc Process for removal of pigments from printed textiles and agents useful therein
US2723178A (en) * 1951-02-10 1955-11-08 American Cyanamid Co Method of controlling the migration of metallized dyes between dye bath and fabric
US2769684A (en) * 1952-12-10 1956-11-06 Ciba Ltd Process for stripping and lightening wool dyeings
US5458737A (en) * 1993-07-27 1995-10-17 Hoechst Celanese Corporation Quaternary compounds as brightness enhancers
US5560805A (en) * 1993-07-27 1996-10-01 Hoechst Celanese Corporation Enhanced decolorization of waste paper with selected amines
US5580422A (en) * 1993-07-27 1996-12-03 Hoechst Celanese Corporation Brightening color dyed wastepaper with a bleaching agent and a quaternary compound
US6120554A (en) * 1998-02-02 2000-09-19 American Renewable Resources Llc Catalyzed alkaline hydrogen peroxide bleaching of dye-containing cellulose textiles
US20060230541A1 (en) * 2001-09-26 2006-10-19 Hirsch Gary F Dye removal from denim scrap with a forced circulation kier
IT202100007712A1 (it) * 2021-03-29 2022-09-29 Soko Chimica S R L Metodo di decolorazione di tessuti

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548914A (en) * 1951-04-17 Color and stain removers for
US2549079A (en) * 1951-04-17 Color and stain removers for
US2549113A (en) * 1951-04-17 Color and stain removers for
US2548892A (en) * 1951-04-17 Color and stain removers for
US2587597A (en) * 1949-07-14 1952-03-04 Arkansas Company Inc Process for removal of pigments from printed textiles and agents useful therein
US2723178A (en) * 1951-02-10 1955-11-08 American Cyanamid Co Method of controlling the migration of metallized dyes between dye bath and fabric
US2769684A (en) * 1952-12-10 1956-11-06 Ciba Ltd Process for stripping and lightening wool dyeings
US5458737A (en) * 1993-07-27 1995-10-17 Hoechst Celanese Corporation Quaternary compounds as brightness enhancers
US5560805A (en) * 1993-07-27 1996-10-01 Hoechst Celanese Corporation Enhanced decolorization of waste paper with selected amines
US5580422A (en) * 1993-07-27 1996-12-03 Hoechst Celanese Corporation Brightening color dyed wastepaper with a bleaching agent and a quaternary compound
US6120554A (en) * 1998-02-02 2000-09-19 American Renewable Resources Llc Catalyzed alkaline hydrogen peroxide bleaching of dye-containing cellulose textiles
US20060230541A1 (en) * 2001-09-26 2006-10-19 Hirsch Gary F Dye removal from denim scrap with a forced circulation kier
IT202100007712A1 (it) * 2021-03-29 2022-09-29 Soko Chimica S R L Metodo di decolorazione di tessuti
EP4067564A1 (fr) * 2021-03-29 2022-10-05 Soko Chimica Srl Procédé de décoloration de tissus

Also Published As

Publication number Publication date
GB400239A (en) 1933-10-19
FR752728A (fr) 1933-09-29
DE605913C (de) 1934-11-20

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