Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
  • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
  • D06M13/224—Esters of carboxylic acids; Esters of carbonic acid
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
  • D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
  • D06M13/325—Amines
  • D06M13/342—Amino-carboxylic acids; Betaines; Aminosulfonic acids; Sulfo-betaines
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
  • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
  • D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
  • D06P1/642—Compounds containing nitrogen
  • D06P1/647—Nitrogen-containing carboxylic acids or their salts
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
  • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
  • D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
  • D06P1/651—Compounds without nitrogen
  • D06P1/65106—Oxygen-containing compounds
  • D06P1/65125—Compounds containing ester groups

Definitions

• the present invention relates to the use of mixed esters as additives in textile processing, especially in the dyeing and printing processes for natural and synthetic fibres and fabrics.
• organic acids and their salts are commonly used as acidulants in the dyeing of wool, nylon, paper, leather and other natural and synthetic fibres with certain acid and chrome dyes.
• Organic acids such as citric acid and acetic acid are also used as components of printing pastes e.g. for printing carpets and in printing processes.
• the use of such acids and salts is disclosed for example in French Patent Application No. 2240317, German Patent Nos C-317725 and C-874291 and in GB-A-1048482.
• These acids and their salts perform several functions in the dyeing and printing processes such as:-
• compositions are formed which regulate the pH e.g. of the dye bath so as to obtain adequate levelling and exhaustion of dyes while fluctuations, odour and corrosivity of the free acids.
• the use of these mixed esters in textile processing not only minimise the problems relating to odour and corrosivity but also has the surprising advantage of eliminating the need in some cases for separate buffering agents.
• the present invention is an acidulant for regulating pH in textile processing characterised in that the acidulant comprises a mixture of triacetin and one or more esters of dibasic acids, said acidulant being substantially free of C1-C3 alkyl acetates.
• the acidulant mixture of the present invention can wholly or partially replace acidulants conventionally used for regulating pH during textile processing.
• the mixture of triacetin and dibasic acid esters may be used as such or in combination with other esters such as glycol mono- and di-formates, glycol mono- and di-acetates, diacetin, or with free C1-C3 monocarboxylic acids.
• the dibasic acid ester used may be suitably selected from the C1-C4 alkyl esters of one or more saturated aliphatic dibasic acids having from 2-12 carbon atoms, preferably from 2-8 carbon atoms.
• Esters of oxalic, succinic, glutaric and adipic acids are preferred and dimethyl esters of these dibasic acids are most preferred.
• Mixed esters of succinic, glutaric and adipic acid esters are particularly preferred. In such a mixture, in which the esters are usually in the form of their dimethyl esters, the specific esters are present in the following ranges of concentration in % w/w:
• the triacetin is suitably present in an amount from 25-95% w/w, preferably from 50-85% w/w of the total acidulant. It is a feature of the invention that the combination of triacetin and the dibasic acid ester shows synergy when used as an acidulant because the mixture of these two compounds shows a lower pH value than is obtainable with the individual components.
• the ester mixture can be incorporated at various points during textile processing, for example at one or more of the stages of scouring of the fabric, bleaching, chlorination, dyeing, mordanting, levelling, exhaustion, fixing, printing, finishing, water-proofing and milling.
• These terms are well known in the art and are defined in standard text books such as for example, "Textile Auxiliaries", by Batty, J.W., Pergamon Press (1967) and "The Theory and Practice of Wool Dyeing" by Bird, C.L. published by the Society of Dyers and Colourists, Bradford, England (1963), 3rd Edition.
• the machine is loaded with wool and water is added together with the ester mixture which wholly or partially replace the conventional acids (e.g. formic acid, acetic acid) normally used, the levelling agents and pH control agents (e.g. sodium and ammonium sulphate).
• the levelling agents e.g. sodium and ammonium sulphate
• additional pH control agents can be omitted because the ester mixture avoids wide fluctuations of pH thus also performing a buffering function.
• the dye bath is held at 40°C for 5-30 minutes, the dye is added and the bath raised to the boil in 45-60 minutes. The dye bath is held at the boil for 30-60 minutes. At this stage more ester mixture can be added, if necessary, to maintain the pH and to complete dye exhaustion.
• the ester mixture used in the present invention may be added with the initial charge of water to replace either the conventional acidulants or the levelling agent or both.
• the concentration used (on a 100% basis) may be in the range of 0.05-5% w/w based on the weight of the liquor being used in the dye bath.
• the ester mixture may be added as such or as solutions of the esters in a solvent. Additionally, the solutions can be used as a solvent carrier for the dyes.
• the control of pH is essential and the ester mixture used in the present invention not only enables such control but also can be added to the dye used for colouring the pulp or the final product paper.
• the ester mixture may be used in the present invention in conjunction with other conventional assistants or agents such as for example wetting agents, anti-foaming agents, solubilising agents and thickeners, used in the dyeing or printing process.
• other conventional assistants or agents such as for example wetting agents, anti-foaming agents, solubilising agents and thickeners, used in the dyeing or printing process.
• a co-solvent such as a glycol or a glycol ether, eg an alkyl diglycol ether such as butyl diglycol ether, to aid the dispersion of the components in the bath, especially if such components are prediluted with water prior to introduction into the dye bath.
• the types of dyes used are not limited by the process of the present invention.
• the dyes may be acid, azoic, basic, direct, indirect, dispersed, reactive, mordant, premetallised, solvent, sulphur, vat dyes and optical brightners.
• the pH profile of the mixture is such that the relatively low pH value is attained rather gradually - which is what is desired in a dye bath - and there is a sudden dip in the pH value when it nears its final value.
• This is a very significant advantage because it is sometimes necessary to add supplementary aliquots of acid at the end of a dyeing cycle in order to ensure complete exhaustion.
• the use of the acidulant of the present invention mitigates the problem of adding supplementary acids.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=10670999

Family Applications (1)

Country Status (3)

Citations (4)

• 1990
  • 1990-02-14 GB GB909003367A patent/GB9003367D0/en active Pending
• 1991
  • 1991-02-13 IE IE048591A patent/IE910485A1/en unknown
  • 1991-02-14 EP EP19910301218 patent/EP0442749A3/en not_active Withdrawn

Patent Citations (4)

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