EP1255889A2 - Procede d'utilisation de systeme de blanchiment hydrophobes dans la preparation de textiles - Google Patents

Procede d'utilisation de systeme de blanchiment hydrophobes dans la preparation de textiles

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Publication number
EP1255889A2
EP1255889A2 EP01910761A EP01910761A EP1255889A2 EP 1255889 A2 EP1255889 A2 EP 1255889A2 EP 01910761 A EP01910761 A EP 01910761A EP 01910761 A EP01910761 A EP 01910761A EP 1255889 A2 EP1255889 A2 EP 1255889A2
Authority
EP
European Patent Office
Prior art keywords
bleaching
fabric
hydrophobic
bleaching solution
textile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01910761A
Other languages
German (de)
English (en)
Inventor
Jiping Wang
Nodie Monroe Washington
Kevin David Moe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP1255889A2 publication Critical patent/EP1255889A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
    • D06L4/15—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using organic agents
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
    • D06L4/13—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using inorganic agents

Definitions

  • the present invention relates to the use of hydrophobic bleaching systems in textile preparation and, more particularly, to the use of activated peroxide bleaching via hydrophobic activators or hydrophobic peracids on woven or knitted fabrics, fibers or yarns.
  • While textile treatments may include a number of varying treatments and stages, the most common include: singeing - the removal of loose or miscellaneous fibers from the surface by burning with a flame; de-sizing - the removal of sizing agents, such as starches, via enzymatic soaking; scouring - the removal of greases, oils, waxes and fats by contact with a solution of sodium hydroxide at temperatures near boiling; mercerization - the application of high levels of sodium hydroxide in conjunction with stretching and pulling of the fabrics for increased fiber strength.
  • An additional common pretreatment step involves a bleaching step to destroy naturally occurring color bodies.
  • the bleaching step provides a uniform white appearance for consumer acceptable whites as well as provides a uniform color base for dyeing or printing.
  • a highly successful bleaching step is necessary for commercially acceptable consumer fabrics.
  • Traditional textile bleaching of natural fibers has involved the use of hydrogen peroxide. Hydrogen peroxide has gained its wide acceptance due to its flexibility of use being capable in both hot and rapid or cold and long dwell bleaching processes and due to its environmental friendliness. While hydrogen peroxide has gained wide spread acceptance in the textile industry, it is not a particularly effective bleaching agent. Hydrogen peroxide, as commercially supplied, is an extremely stable compound and as a result has only a slight bleaching effect on natural fibers.
  • Tetra acetyl ethylene diamine or TAED is a common hydrophilic bleach activator widely accepted in the consumer laundry bleaching applications to provide effective bleaching at lower wash temperatures.
  • TAED has been taught in hydrogen peroxide textile bleaching, and in particular in the bleaching of regenerated cellulosics such as rayon.
  • TAED has allowed lower bleaching temperatures, it has proven to provide little advantage in the fiber damage and fiber strength of cellulosics such as rayon.
  • the poor water solubility of TAED limits its application in textile processing.
  • EP 584,710 discloses the use of activated bleaching in textile mill applications wherein NOBS is briefly disclosed along with a multitude of other classes and types of activators. While NOBS is disclosed, there is no successful application of hydrophobic bleaching technology where acceptable whiteness values are achieved while damage to fabrics and fibers is minimized. Indeed, EP 584,710 specifies that in order to achieve acceptable whiteness benefits, additional alkali bleaching is necessary which will dramatically increase fiber damage.
  • the need remains for an effective textile treatment process and in particular for improved hydrogen peroxide bleaching for textile treatment which can provide superior whiteness benefits at reduced bleaching temperatures and times while providing improved fabric strength retention versus conventional textile bleaching processes.
  • the present invention wherein a method for the treatment of textiles using activated peroxygen bleaching with hydrophobic bleaching systems is provided.
  • the process involves the use of a hydrogen peroxide and a hydrophobic bleach activator or a hydrophobic peracid.
  • a hydrophobic bleaching agent provides superior whiteness and fabric strength and fiber damage benefits, i.e. strength retention to fibers, yarns and fabrics and less fiber damage.
  • the method of the present invention allows for cost reduction in the operation of a textile bleaching process through the use of significantly lower bleaching temperatures than conventional peroxide bleaching and much shorter processing times, particularly in batch processing.
  • hydrophobic bleaching agent of the present invention provide better absorbency on the fabrics and yarns and better "wetting" of the surface of the fibers than conventional peroxide bleaching techniques or hydrophilic activators.
  • Hydrophobic bleach activators form the active bleaching species, peracid, on the surface of the fabric allowing a longer time on the surface of the fabric.
  • Hydrophilic activators meanwhile, form peracid in solution and must then undergo a fabric solution interaction which is less efficient.
  • the hydrophobic bleaching agents of the present invention provide superior bleaching and whiteness while minimizing fiber damage and strength reduction.
  • a method for the treatment of non-finished textile components comprises the steps of providing a non- finished textile component such as a fiber, yarn or fabric, saturating the textile component with an aqueous bleaching solution comprising hydrogen peroxide and a hydrophobic bleaching agent such as a hydrophobic activator or a pre-formed hydrophobic peracid, and allowing the bleaching solution to remain in contact with the textile component for a period of time sufficient to bleach the textile component to a CIE whiteness of at least 70 .
  • the bleaching solution comprises hydrogen peroxide and a hydrophobic bleach activator which is selected from the group consisting of : a) a bleach activator of the general formula:
  • R is an alkyl group having from about 5 to about 17, preferably from about 7 to about 11, carbon atoms and L is a leaving group; b) a bleach activator of the general formula:
  • R is an alkyl, aryl, or alkaryl group containing from about 1 to
  • R is an alkylene, arylene or alkarylene group containing from about 1 to about 14 carbon atoms, R is H or an alkyl, aryl, or alkaryl group containing from about 1 to about 10 carbon atoms, and L is a leaving group; c) a benzoxazin-type bleach activator of the formula:
  • R. is H, alkyl, alkaryl, aryl, arylalkyl, and wherein R», R ⁇ , R ., and R, may be the same or different substituents selected from H, halogen, alkyl, alkenyl, aryl, hydroxyl, alkoxyl, amino, alkylamino, -COOR,-, wherein R fi is H or an alkyl group and carbonyl functions; d) a N-acyl caprolactam bleach activator of the formula: wherein R is H or an alkyl, aryl, alkoxyaryl, or alkaryl group containing from 1 to 12 carbons; and mixtures of a, b, c and d with the alkanoyloxybenzenesulfonates of the formula:
  • i is an alkyl group having from about 7 to 11 carbon atoms and M is a suitable cation being the most preferred hydrophobic activators.
  • the bleaching solution further includes an ingredient selected from the group of wetting agents, sequestering agents, stabilizing agents, desizing agents, scouring agents, detergents and mixtures thereof.
  • Preferred ranges of peroxide and activator are from about lg/L to about 20 g/L hydrogen peroxide with a molar ratio of hydrophobic bleach activator to hydrogen peroxide of from about 1 : 1 to 1 :50.
  • the textile components remain in contact with the bleaching solution at a temperature of from about 20 to about 80 °C, preferably from about 50°C to about 80 °C and for a period of time suitable for whitening the textile component which is typically at least about 15 minutes, more typically from about 15 minutes to about 180 minutes, and even more typically from about 30 to about 60 minutes.
  • the textile component experiences a fabric strength reduction of less than about 10% and more preferably less than about 5% due to the bleaching of the present invention.
  • the textile component experiences a fluidity increase of less than about 25% repsresenting significantly improved fiber damage.
  • a method for the batch treatment of a non-finished textile woven fabric comprises the steps of: providing an incoming non-finished woven fabric; passing the woven fabric to an aqueous bleaching solution comprising a mixture of hydrogen peroxide and a hydrophobic bleach activator or a pre-formed hydrophobic peracid, heating the bleaching solution to a temperature of from about 20 to about 90 °C and allowing the bleaching solution to contact the fabric for a period of time of from about 15 to about 180 minutes.
  • an object of the present invention to provide a method for the treatment of textile components such as fibers, yarns and fabrics which provides superior whiteness on textiles without a significant reduction in fabric strength, and potential fiber damage common to conventional preparation processes. It is another object of the present invention to provide a method for the treatment of textile components employing a hydrophobic bleach activator or preformed peracid in conjunction with hydrogen peroxide.
  • a superior textile treatment process for fibers, yams and fabrics, both knitted and woven is provided.
  • the proper preparation of a textile component such as a fiber, yarn or fabric is critical to the success of further treatment in the manufacture of commercially feasible textile components such as yarns, fabrics, garments, and the like.
  • These treatment steps include dyeing, printing and/or finishing such as application of durable press finishes. Uneven color appearance or impurities such as waxes or oils on the surface of the textile prevent the uniform application of many treatments.
  • the present invention provides a cost effective and superior performing alternative to the conventional processing.
  • the present invention involves the use of a hydrophobic bleaching agent such as an activator or peracid in conjunction with peroxide for the bleaching of non- finished textile components. These hydrophobic bleaching species provide superior results in the context of textile whiteness and in fabric strength retention.
  • the method of the present invention provides satisfactory whiteness values of more than 70 on the CIE whiteness index while delivering superior fabric strength retention by providing a fabric strength reduction of less than about 10%, more preferably less than about 5% and most preferably less than about 3% from of the original fabric strength. Additionally, the method of the present invention provides a degradation of the fibers of less than 25%, more preferably less than 15% and even more preferably of no more than 10% whereby an increase in degradation represents an increase in fiber damage.
  • the use of the method of the present invention results in a significant reduction in fiber damage as opposed to conventional bleaching technology of peroxide at more than 95° which produces significantly higher degradation.
  • These unique achievements are accomplished due to the lower bleaching temperatures and surface activity possible through the method of the present invention.
  • the method of the present invention provides a significant cost advantage through the use of lower bleaching temperatures.
  • the cost savings in both energy and time in batch type processing via the present invention are significant.
  • Conventional batch processing involves the immersion of the non- finished fabrics in a bleaching solution and heating of the bleaching solution to the effective temperature of more than 95 °C. The heating of the fabric and solution to such high temperatures involves a significant investment of both money and time for heating such large quantities.
  • the present invention involves the use of an aqueous bleaching solution of hydrogen peroxide and a hydrophobic bleaching species such as a hydrophobic activator or a pre-formed hydrophobic peracid.
  • the hydrogen peroxide or pre-formed peracid is present in the bleaching solution of the present invention at levels of from about 1 to about 20 g/L, more preferably from about 1 to about 10 g/L and most preferably from about 1.5 to about 5 g/L.
  • the hydrophobic activator is then employed at molar ratios of activator to peroxide of from about 1 : 1 to about 1:50, more preferably from about 1 :2 to about 1 :30 and even more preferably from about 1 :5 to about 1:20. Meanwhile, the ratio of bleaching solution or liquor to the amount of fabric is from about 5:1 to 100:1, more preferably from about 5: 1 to about 40:1 and most preferably from about 8:1 to about 20:1. Particularly useful and preferred is the combination of hydrogen peroxide and hydrophobic bleach activators, and in particular the alkanoyloxy class of bleach activators having the general formula:
  • R is an alkyl chain having from about 5 to about 17, preferably from about 7 to about 1 1 carbon atoms and L can be essentially any suitable leaving group.
  • a leaving group is any group that is displaced from the bleaching activator as a consequence of the nucleophilic attack on the bleach activator by the perhydroxide anion. This, the perhydrolysis reaction, results in the formation of the peroxycarboxylic acid.
  • a group to be a suitable leaving group it must exert an electron attracting effect. It should also form a stable entity so that the rate of the back reaction is negligible. This facilitates the nucleophilic attack by the perhydroxide anion.
  • L must be sufficiently reactive for the reaction to occur within the optimum time frame (e.g., a wash cycle). However, if L is too reactive, this activator will be difficult to stabilize for use in a bleaching composition.
  • pKa of the conjugate acid of the leaving group although exceptions to this convention are known. Ordinarily, leaving groups that exhibit such behavior are those in which their conjugate acid has a pKa in the range of from about 4 to about 13, preferably from about 6 to about 11 and most preferably from about 8 to about 11.
  • L is selected from the group consisting of:
  • R is an alkyl, aryl, or alkaryl group containing from about 1 to about 14 carbon atoms
  • R 3 is an alkyl chai •n containing from 1 to about 8 carbon atoms
  • R 4 is H
  • M is a cation which provides solubility to the bleach activator and X is an anion which provides solubility to the bleach activator.
  • M is an alkali metal, ammonium or substituted ammonium cation, with sodium and potassium being most preferred, and X is a halide, hydroxide, methylsulfate or acetate anion. It should be noted that bleach activators with a leaving group that does not contain a solubilizing groups should be well dispersed in the bleaching solution in order to assist in their dissolution.
  • Preferred bleach activators are those of the above general formula wherein L is selected from the group consisting of:
  • alkanoyloxybenzenesulfonates of the formula:
  • Ri contains from about 7 to about 12, preferably from about 8 to about 11 , carbon atoms and M is a suitable cation, such as an alkali metal, ammonium, or substituted ammonium cation, with sodium and potassium being most preferred.
  • hydrophobic alkanoyloxybenzenesulfonates are selected from the group consisting of nonanoyloxybenzenesulfonate, 3,5,5-trirnethylhexanoyloxybenzene-sulfonate, 2-ethylhexanoyloxybenzenesulfonate, octanoyloxybenzenesulfonate, decanoyl- oxybenzenesulfonate, dodecanoyloxybenzenesulfonate, and mixtures thereof.
  • amido derived bleach activators may be employed in the present invention. These activators are amide substituted compounds of the general formulas:
  • R is an alkyl, aryl, or alkaryl group containing from about 1 to
  • R is an alkylene, arylene or alkarylene group containing from about 1 to about 14 carbon atoms
  • R is H or an alkyl, aryl, or alkaryl group containing from about 1 to about 10 carbon atoms
  • L is a leaving group as defined above.
  • Preferred bleach activators are those of the above general formula are wherein R is an
  • R contains from about 4 to about 5 carbon atoms and wherein L is selected from the group consisting of:
  • R is as defined above and Y is -SO, M or -CO- M wherein M is as defined above.
  • Another important class of bleach activators provide organic peracids as described herein by ring-opening as a consequence of the nucleophilic attack on the carbonyl carbon of the cyclic ring by the perhydroxide anion.
  • this ring-opening reaction in caprolactam activators involves attack at the caprolactam ring carbonyl by hydrogen peroxide or its anion. Since attack of an acyl caprolactam by hydrogen peroxide or its anion occurs preferably at the exocyclic carbonyl, obtaining a significant fraction of ring-opening may require a catalyst.
  • Another example of ring-opening bleach activators can be found in the benzoxazin type activators.
  • activator compounds of the benzoxazin-type have the formula:
  • R. is H, alkyl, alkaryl, aryl, arylalkyl, and wherein R ⁇ , R-, R ., and R, may be the same or different substituents selected from H, halogen, alkyl, alkenyl, aryl, hydroxyl, alkoxyl, amino, alkyl amino, COOR fi (wherein R fi is H or an alkyl group) and carbonyl functions.
  • R fi is H or an alkyl group
  • N-acyl caprolactam bleach activators may be employed in the present invention. These activators have the formula:
  • R is H or an alkyl, aryl, alkoxyaryl, or alkaryl group containing from 1 to 12 carbons.
  • Caprolactam activators wherein the R moiety contains at least about 6, preferably from 6 to about 12, carbon atoms provide hydrophobic bleaching which affords nucleophilic and body soil clean-up, as noted above.
  • Highly preferred hydrophobic N-acyl caprolactams are selected from the group consisting of benzoyl caprolactam, octanoyl caprolactam, nonanoyl caprolactam, decanoyl caprolactam, undecenoyl caprolactam, 3,5,5-trimethylhexanoyl caprolactam, and mixtures thereof.
  • a pre-formed peracid may be employed in lieu of the peroxide and activator.
  • the pre-formed hydrophobic peracid are preferably selected from the group consisting of percarboxylic acids and salts, percarbonic acids and salts, perimidic acids and salts, peroxymonosulfuric acids and salts, and mixtures thereof, examples of which are described in
  • R is an alkylene or substituted alkylene group containing from 1 to about 22 carbon atoms or a phenylene or substituted phenylene group
  • Y is hydrogen, halogen, alkyl, aryl, - C(0)OH or -C(0)OOH.
  • Organic peroxyacids suitable for use in the present invention can contain either one or two peroxy groups and can be either aliphatic or aromatic.
  • the organic peroxycarboxylic acid is aliphatic, the unsubstituted peracid has the general formula:
  • Y can be, for example, H, CH3, CH2CI, C(0)OH, or C(0)OOH; and n is an integer from 0 to 20.
  • the organic peroxycarboxylic acid is aromatic, the unsubstituted peracid has the general formula:
  • Y can be, for example, hydrogen, alkyl, alkylhalogen, halogen, C(0)OH or C(0)OOH.
  • Typical monoperoxy acids useful herein include alkyl and aryl peroxyacids such as:
  • peroxybenzoic acid and ring-substituted peroxybenzoic acid e.g. peroxy-a-naphthoic acid, monoperoxyphthalic acid (magnesium salt hexahydrate), and o- carboxybenzamidoperoxyhexanoic acid (sodium salt);
  • aliphatic, substituted aliphatic and arylalkyl monoperoxy acids e.g. peroxylauric acid, peroxystearic acid, N-nonanoylaminoperoxycaproic acid (NAPCA), N,N-(3- octylsuccinoyl)aminoperoxycaproic acid (SAP A) and N,N-phthaloylaminoperoxycaproic acid
  • PAP peroxysuccinic acid
  • NAPAA peroxyadipic acid
  • Typical diperoxyacids useful herein include alkyl diperoxyacids and aryldiperoxyacids, such as:
  • Sources also include 6-nonylamino-6-oxoperoxycaproic acid as fully described in U.S. Patent 4,634,551, issued January 6, 1987 to Burns et al.
  • Persulfate compounds such as for example OXONE, manufactured commercially by E.I. DuPont de Nemours of Wilmington, DE can also be employed as a suitable source of peroxymonosulfuric acid.
  • the bleaching solutions of the present invention may also include various adjunct ingredients.
  • Such ingredients include sequestering or chelating agents, wetting agents, pH control agents, bleach catalysts, stabilizing agents, detergents and mixtures thereof.
  • Wetting agents are typically selected from surfactants and in particular nonionic surfactants. When employed wetting agents are typically included at levels of from about 0.1 to about 10 g/L, more preferably from about 0.1 to about 5 g/L, and more preferably 0.2 to about 1 g/L of the bath.
  • Stabilizing agents are employed for a variety of reasons including buffering capacity, sequestering, dispersing and in addition enhancing the performance of the surfactants.
  • Stabilizing agents are well known with both inorganic or organic species being well known and silicates and organophosphates gaining the broadest acceptance and when present are employed at levels of from about 0 to about 10 g L, more preferably from about 0.1 to about 5 g/L and most preferably from about 0.1 to about 3 g/L of the bath.
  • sodium hydroxide is included in the bleaching solution at levels of from about 0.5 to about 20 g/L, more preferably from about 1 to about 10 g/L and most preferably at levels of from about 1.5 to about 5 g L.
  • Chelating agents may also be employed and can be selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally-substituted aromatic chelating agents and mixtures therein, all as hereinafter defined.
  • Amino carboxylates useful as optional chelating agents include ethylenediaminetetrace- tates, N-hydroxyethylethylenediaminetriacetates, nitrilotriacetates, ethylenediamine tetrapro- prionates, triethylenetetraaminehexacetates, phosphonates to not contain alkyl or alkenyl groups with more than about 6 carbon atoms.
  • Polyfunctionally-substituted aromatic chelating agents are also useful in the compositions herein.
  • Preferred compounds of this type in acid form are dihydroxydisulfobenzenes such as l,2-dihydroxy-3,5- disulfobenzenediethylenetriaminepentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts therein and mixtures therein.
  • Amino phosphonates are also suitable for use as chelating agents in the compositions of the invention when at least low levels of total phosphorus are permitted.
  • EDDS ethylenediamine disuccinate
  • [S,S] isomer as described in U.S. Patent 4,704,233, November 3, 1987, to Hartman and Perkins.
  • chelating agents are employed at levels of from about 0.01 to about 10 g/L, more preferably from about 0.1 to about 5 g/L, and most preferably from about 0.2 to about 2 g/L.
  • Bleach catalysts may also be employed in the bleaching solutions of the present invention.
  • One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal cation of defined bleach catalytic activity, such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese cations, an auxiliary metal cation having little or no bleach catalytic activity, such as zinc or aluminum cations, and a sequestrate having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, ethylenediaminetetra (methylenephosphonic acid) and water- soluble salts thereof.
  • a transition metal cation of defined bleach catalytic activity such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese cations
  • an auxiliary metal cation having little or no bleach catalytic activity such as zinc or aluminum cations
  • a sequestrate having defined stability constants for the cata
  • bleach catalysts include the manganese-based complexes disclosed in U.S. Pat. 5,246,621 and U.S. Pat. 5,244,594. Preferred examples of theses catalysts include Mn ⁇ 2( u_ 0) 3 ( 1 ,4,7-trimethyl- 1 ,4,7-triazacyclononane) 2 -(PF 6 ) 2 ("MnTACN"), Mn m 2 (u-0) (u- OAc)2( 1 ,4,7-trimethyl- 1 ,4,7-triazacyclononane)2-(Cl ⁇ 4)2, Mn IV 4(u-0)g( 1 ,4,7- triazacyclononane)4-(Cl ⁇ 4)2, Mn III Mn IV 4(u-0) 1 (u-OAc)2(l ,4,7-trimethyl-l,4,7- triazacyclononane)2-(C104)3, and mixtures thereof.
  • ligands suitable for use herein include l,5,9-trimethyl-l,5,9- triazacyclododecane, 2-methyl- 1 ,4,7-triazacyclononane, 2-methyl-l,4,7-triazacyclononane, and mixtures thereof.
  • suitable bleach catalysts herein see U.S. Pat. 4,246,612, U.S. Pat. 5,227,084 and WO 95/34628, December 21, 1995, the latter relating to particular types of iron catalyst.
  • Preferred ligands include sorbitol, iditol, dulsitol, mannitol, xylitol, arabitol, adonitol, meso-erythritol, meso-inositol, lactose, and mixtures thereof.
  • U.S. Pat. 5,114,611 teaches another useful bleach catalyst comprising a complex of transition metals, including Mn, Co, Fe, or Cu, with an non-(macro)-cyclic ligand.
  • Preferred ligands include pyridine, pyridazine, pyrimidine, pyrazine, imidazole, pyrazole, and triazole rings.
  • said rings may be substituted with substituents such as alkyl, aryl, alkoxy, halide, and nitro.
  • substituents such as alkyl, aryl, alkoxy, halide, and nitro.
  • Particularly preferred is the ligand 2,2'-bispyridylamine.
  • Preferred bleach catalysts include Co-, Cu-, Mn-, or Fe- bispyridylmethane and bispyridylamine complexes.
  • Highly preferred catalysts include Co(2,2'-bispyridylamine)Cl2, Di(iso_hiocyanato)bispyridylamine-cobalt (II), trisdipyridylamine-cobalt(II) perchlorate, Co(2,2-bispyridylamine)2 ⁇ 2Cl ⁇ 4, Bis-(2,2'- bispyridylamine) copper(II) perchlorate, tris(di-2-pyridylamine) iron(II) perchlorate, and mixtures thereof.
  • bleach catalyst examples include Mn gluconate, Mn(CF3803)2, Co(NH3)5 ⁇ , and the binuclear Mn complexed with tetra-N-dentate and bi-N-dentate ligands, including N4Mn ⁇ (u- 0) 2 Mn IV N 4 ) + and [Bipy2Mn m (u-0) 2 Mn Iv bipy2]-(C10 4 )3.
  • manganese catalyst for use herein are those which are fully disclosed in WO 98/23249, WO 98/39098, WO 98/39406 and WO 98/39405, the disclosures of which, are herein incorporated by reference.
  • bleach catalysts are described, for example, in European patent application, publication no. 408,131 (cobalt complex catalysts), European patent applications, publication nos. 384,503, and 306,089 (metallo-porphyrin catalysts), U.S. 4,728,455 (manganese/multidentate ligand catalyst), U.S. 4,711 ,748 and European patent application, publication no. 224,952,
  • Oxygen bleaches preferably used in conjunction with such oxygen transfer agents or precursors include percarboxylic acids and salts, percarbonic acids and salts, peroxymonosulfuric acid and salts, and mixtures thereof. See also U.S. 5,360,568; U.S. 5,360,569; and U.S. 5,370,826.
  • the invention relates to a detergent composition which incorporates a transition-metal bleach catalyst in accordance with the invention, and organic bleach catalyst such as one named hereinabove.
  • the method of the present invention involves providing a non-finished textile component into the bleaching solution as described.
  • the textile component may comprise fibers, yams and fabrics including wovens, nonwovens and knits.
  • non-finished it is intended that the textile component be a material that has not been dyed, printed, or otherwise provided a finishing step such as durable press finish.
  • a finishing step such as durable press finish.
  • the textile component of the present invention are those that have not been passed through a garment or other manufacturing process involving cutting and sewing of the material.
  • the present process may be employed with most any natural material including cellulosics such as cotton, linen and regenerated cellulosics such as rayon and lyocell. Both 100% natural fibers, yarns and fabrics may be employed or blends with synthetic materials may be employed as well.
  • natural fibers may include cellulosics as described herein, wools both pure and blends, silks, sisal, flax and jute.
  • the method of the present invention may include the further steps of singeing, de-sizing, scouring, and mercerization in conjunction with the bleaching step. These steps may be performed in various combinations and orders and one of ordinary skill in the art will recognize that varying combinations are possible.
  • the de-sizing step of the present invention involves the removal of sizing agents such as starch and polyvinyl alcohol added to fibers during weaving of yams.
  • the de-sizing step involves the use of an aqueous solution of amylase enzymes and typically wetting agents and salts and soaking or contacting the fabrics with the enzymatic solution of a time sufficient to remove the sizing agents.
  • the scouring step of the present invention involves the removal of natural or synthetic impurities from the textiles such as waxes and oils.
  • the scouring step involves the use of an aqueous alkaline bath, typically sodium hydroxide at elevated temperatures.
  • Optional ingredients in the alkaline bath include wetting agents and chelating agents.
  • the mercerization step of the present invention involves the application of high concentrations of alkali such as sodium hydroxide in conjunction with stretching and pulling of the textiles to restore fiber strength and improve luster while singeing involves passing the textiles over an open flame to remove loose fibers or strands.
  • alkali such as sodium hydroxide
  • the process of the present invention includes in the preferred applications a washing step or series of washing steps following the method of the present invention. Washing of treated textiles is well known and within the level of skill of the artisan. Washing stages will be typically present after each of the de-sizing, scouring and mercerization step when present as well as after the bleaching step of the present invention.
  • the bleaching and de-sizing scouring or mercerization steps when present may in preferred embodiments include a wet-out or pre-wetting step to ensure even or uniform wettness in the textile component.
  • the method of the present invention provides superior wettability to textile components treated via the method. Wettability of the textiles is important to any dyeing and finishing of the textiles. Wettability leads to superior penetration of the textile by the dye or finish agents and a superior dye and/or finishing result. Accordingly, the wettability of the textile is an indication of how effective the treatment process has been. Higher wettability means a more effective and superior treatment process, i.e. a shorter period of time for wetting. Conventional textile peroxygen bleaching has provided acceptable wetting profiles only at temperature in excess of 95°C while lower temperature bleaching (70°C) results in wettability profiles more than about 40%. However, the process of the present invention provides fabrics that have a increase in the wettability index of less than about 10% preferably less than about 5% where the wettability index is defined as:
  • fiber degradation or damage is based on fluidity as measured via AATCC test method 82-1996 involving the dispersion of the fibers in cupriethylene diamine (CP).
  • An increase in fluidity between treated fibers and non-treated fibers represents an increase in the amount of fiber damage.
  • c viscometer constant
  • t efflux time
  • d density of the solution 1.052.
  • a process for the bleaching and preparation according to the present invention may be conducted in the following manner.
  • the process may be carried out in a automatic lab dyeing machine with an infrared heating system (Labmat) made by Mathis Co.
  • the bleaching bath was prepared by adding the chemicals as outlined in Table I below to de-ionized water.
  • the addition sequence was as follows: Wetting agent - Chelating agent - Activator - H 2 0 2 - NaOH - Fabric.
  • the fabric was a de-sized and scoured 100% cotton print cloth, plain woven with 122 g/m 2 weight.
  • the original fabric whiteness was 32.58 on the CIE scale. With a liquor/fabric ratio of 15: 1, the fabric was put into the solution.
  • the solution was heated from about 20 °C to required bleaching temperature per Table I in about 10 min, kept at the required temperature for 50 min, and then cooled down to the room temperature.
  • the fabric was removed from the bleaching solution and washed completed with hot water and warm water to ensure no residual alkali remained on the fabric.
  • the fabric was dried and conditioned under 70 °F and 65% relative humidity for wetting and whiteness measurements.
  • Miniscan XE Plus made by HunterLab was used to measure CIE Whiteness Index.
  • An Instron was used to evaluate the fabric strength by following the method ASTM D 5035.
  • the fabric wettability was measured by AATCC Test Method 79-1995. The less wetting time, the better fabric wettability or absorbency. TABLE I

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne un procédé de traitement d'un composant textile non fini, comprenant l'étape suivante consistant à traiter ce composant textile non fini dans une solution aqueuse de blanchiment composée d'hydrogène et d'un activateur de blanchiment hydrophobe ou d'un peracide hydrophobe. Des activateurs de blanchiment préférés comprennent les sulfonates d'alcanoyloxybenzène, et notamment le sulfonate de noanoyloxybenzène. Ce procédé apporte une protection supérieure aux fibres et confère une résistance avantageuse aux tissus par rapport aux traitements classiques, de même qu'il permet des économies à la fois d'énergie et de temps, par suite d'un emploi de températures de blanchiment plus basses.
EP01910761A 2000-02-15 2001-02-15 Procede d'utilisation de systeme de blanchiment hydrophobes dans la preparation de textiles Withdrawn EP1255889A2 (fr)

Applications Claiming Priority (3)

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US18270200P 2000-02-15 2000-02-15
US182702P 2000-02-15
PCT/US2001/004899 WO2001060960A2 (fr) 2000-02-15 2001-02-15 Procede d'utilisation de systeme de blanchiment hydrophobes dans la preparation de textiles

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EP1255889A2 true EP1255889A2 (fr) 2002-11-13

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EP (1) EP1255889A2 (fr)
JP (1) JP2003523485A (fr)
CN (1) CN1205378C (fr)
AU (1) AU2001238334A1 (fr)
BR (1) BR0108336A (fr)
WO (1) WO2001060960A2 (fr)

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DE60210085T2 (de) * 2001-06-29 2006-11-09 The Procter & Gamble Company, Cincinnati Stabilitätsverstärktes persäurebleichungssystem geeignet für gewebebehandlung
CN102844491B (zh) * 2010-03-26 2016-03-09 丹尼斯科美国公司 使用具有过水解酶活性的酶处理角质纤维
DE102014207727A1 (de) * 2014-04-24 2015-10-29 Cht R. Beitlich Gmbh Verfahren zum Aufhellen von gefärbten Textilien
CN107419511B (zh) * 2017-09-11 2020-03-17 广东溢达纺织有限公司 纺织材料的漂白方法及纺织产品
CN110042647B (zh) * 2019-04-02 2022-02-18 嘉兴学院 一种羊绒或羊毛的高白度低温漂白方法
CN112482014A (zh) * 2020-12-04 2021-03-12 东华大学 一种羊绒散纤维的室温漂白方法

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EP0584710A3 (fr) * 1992-08-22 1995-02-01 Hoechst Ag Procédé de blanchiment de textiles.
ES2120047T3 (es) * 1993-05-20 1998-10-16 Procter & Gamble Metodos de blanqueo con activadores de peroxiacido utilizados con enzimas.
WO1995021283A1 (fr) * 1994-02-07 1995-08-10 Warwick International Group Limited Procede de blanchiment de textiles

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See also references of WO0160960A3 *

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AU2001238334A1 (en) 2001-08-27
WO2001060960A3 (fr) 2002-05-30
JP2003523485A (ja) 2003-08-05
WO2001060960A2 (fr) 2001-08-23
CN1205378C (zh) 2005-06-08
CN1439070A (zh) 2003-08-27
BR0108336A (pt) 2003-01-07

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