Classifications

• • 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
  • D06P1/52—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 synthetic macromolecular substances
  • D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
  • D06P1/5257—(Meth)acrylic acid
• • 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
  • D06P1/52—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 synthetic macromolecular substances
  • D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
• • 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
  • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
  • D06P5/15—Locally discharging the dyes
  • D06P5/158—Locally discharging the dyes with other compounds

Definitions

• the present invention relates to processes of providing localized variation in the colour of dyed fabrics.
• the most usual method of providing a "stone-washed" look (localized abrasion of the colour) in dyed fabrics, in particular cellulose-containing fabrics, is by washing cellulose-containing fabrics or clothing made from such fabrics in the presence of pumice stones to provide the desired localized lightening of the colour of the fabric Using pumice for this purpose has the disadvantage that pumice particles have to be washed from the fabric or clothing subsequently to treatment, and that the pumice stones and particles cause a significant wear of the machines used in the process. Also, handling large amounts of stones may be a problem.
• the present invention is based on the surprising finding that it is possible to obtain improved utilization of the ability of cellulytic enzymes to provide localized colour variations in dyed fabrics either by adding a chelating agent to a wash liquor containing calcium ions and other di- or trivalent cations, or by carrying out the process in soft water.
• the present invention relates to a process for providing improved localised variation in the colour density of the surface of dyed fabrics, the process comprising treating a dyed fabric with a cellulytic enzyme in an aqueous liquor comprising a di- or trivalent cation and a chelating agent in a molar ratio of 1:0.1-50.
• the present invention relates to a process for providing improved localised variation in the colour density of the surface of dyed fabrics, the process comprising treating a dyed fabric with a cellulytic enzyme in an aqueous liquor comprising less than 20 mg/1 of Ca + and Mg + .
• the expression "improved localized variation” is intended to indicate that the differences between lighter and darker areas of the fabrics is more pronounced than in fabrics treated by the enzymatic process described in, e.g. US 4,832,864. It has been found that in the known enzymatic "stone-washing" processes for obtaining localized colour variations, at least some (though not all) of the dye washed from the fabric is redeposited thereon so that the difference between darker and lighter shades on the fabric is somewhat obscured (this phenomenon is known as backstaining to people skilled in the art) . It has surprisingly been found that by reducing the amount of free calcium or other di- or trivalent cations in the liquor in which the fabric is treated (e.g. by the addition of a chelating agent to calcium-containing water or by using soft water) , such redeposition of dye may be significantly reduced.
• the di- or trivalent cations present in the wash liquor may be alkaline earth metal ions, in particular Ca 2+ or Mg 2+ .
• the molar ratio between di- or trivalent ions and chelating agent depends on the nature of the chelating agent. However, a currently preferred ratio of di- or trivalent cations (such as Ca ++ ) to chelating agent is 1:0.1-10, more preferably 1:0.2-5.
• the process of the invention is most beneficially applied to cellulose-containing fabrics, such as cotton, viscose, rayon, ramie, linen, Tencel or mixtures thereof, or mixtures of any of of these fibres with synthetic fibres.
• the fabric is denim.
• the fabric may be dyed with vat dyes such as indigo, direct dyes such as Direct Red 185, sulphur dyes such as Sulfur Green 6, or reactive dyes fixed to a binder on the fabric surface.
• vat dyes such as indigo
• direct dyes such as Direct Red 185
• sulphur dyes such as Sulfur Green 6
• reactive dyes fixed to a binder on the fabric surface.
• the fabric is indigo-dyed denim, including clothing items manufactured therefrom.
• the cellulytic enzyme employed in the process of the invention may be any cellulase previously suggested for this purposes (e.g. as described in US 4,832,864).
• the cellulytic enzyme may be a fungal or bacterial cellulase.
• both acid and neutral or alkaline cellulases may be employed (the selection of the chelating agent will, however, depend on the type of cellulase used) .
• suitable acid cellulases are those derivable from a strain of Trichoderma. Irpex, Clostridium or Thermocellum sp.
• suitable neutral or alkaline cellulases are those derivable from a strain of Humicola, Fusarium.
• Preferred cellulases may be obtained from Humicola insolens.
• a currently preferred cellulase is a 43 kD endoglucanase obtainable from Humicola insolens (e.g. described in WO 91/17243) .
• the chelating agent may be one which is soluble and capable of forming complexes with di- or trivalent cations (such as calcium) at acid, neutral or alkaline pH values.
• di- or trivalent cations such as calcium
• the choice of chelating agent depends on the cellulase employed in the process. Thus, if an acid cellulase is included, the chelating agent should be one which is soluble and capable of forming a complex with di- or trivalent cations at an acid pH. If, on the other hand, the cellulase is neutral or alkaline, the chelating agent should be one which is soluble and capable of forming a complex with di- or trivalent cations at a neutral or alkaline pH.
• the chelating agent may suitably be selected from aminocarboxylic acids; hydroxyaminocarboxylic acids; hydroxycarboxylic acids; phosphates, di-phosphates, tri- polyphosphates, higher poly-phosphates, pyrophosphates; zeolites; polycarboxylic acids; carbohydrates, including polysaccharides; hydroxypyridinones; organic compounds comprising catechol groups; organic compounds comprising hydroxymate groups; silicates; or polyhydroxysulfonates.
• the chelating agent is an aminocarboxylic acid
• it may suitably be selected from EDTA (ethylene diamine tetra-acetic acid) , DTPA (diethylene tria ine pentaacetic acid), NTA (nitrilo triacetic acid), CDTA (trans-1,2- diaminocyclohexane-N,N,N* ,N'-tetraacetic acid), EGTA (ethyleneglyco1-0, 0 • -bis (2-aminoethyl )-N,N,N' ,N'- tetraacetic acid) , or TTHA (triethylenetetraamine- N,N,N' ,N'-hexaacetic acid).
• EDTA ethylene diamine tetra-acetic acid
• DTPA diethylene tria ine pentaacetic acid
• NTA nitrilo triacetic acid
• CDTA trans-1,2- diaminocyclohexane-N
• the chelating agent is a hydroxyaminocarboxylic acid
• it may suitably be selected from HEDTA (hydroxyethylene diamine triacetic acid) , DEG/DHEG (dihydroxyethyl glycine) , or HEIDA (N-(2.-h.ydrox ethyl)-iminodiacetat) , .
• the chelating agent is a hydroxycarboxylic acid
• it may suitably be selected from gluconic acid, citric acid, tartaric acid, oxalic acid, diglycolic acid, or glucoheptonate.
• the chelating agent is a polyamino- or polyhydroxy- phosphonate or -polyphosphonate
• it may suitably be selected from PBTC (phosphonobutantriacetat) , ATMP (aminotri(methylenphosphonic acid)), DTPMP (diethylene triaminpenta(methylenphosphonic acid) , EDTMP ethylene diamintetra(methylenphophonic acid) ) , HDTMP (hydroxyethyl- ethylendiamintri(methylenphosphonic acid)), HEDP (hydroxyethane diphosphonic acid) , or HMDTMP (hexamethylen-diamine tetra(methylene phosphonic acid)).
• the chelating agent is a polycarboxylic acid (or a mixture of polycarboxylic acids)
• it may suitably be selected from water soluble salts of homo- and copolymers of aliphatic carboxylic acids such as aleic acid, itaconic acxid, mesaconic acid, fumaric acid, aconitic acid, citraconic acid and methylenemalonic acid; carboxymethyloxymalonate, carboxymethyloxysuccinate, cis- cy c l oh e x a n e h e x a c a rb oxy l a t e , c i s - cyclopentanetetracarboxylate, phloroglucinoltrisulfonate; polyacetal carboxylates.
• polycarboxylic acids may be selected from polyacrylate, polymaleate, maleic-methylvinylether- copolymers, maleic-acrylic-copolymers, maleic-olefine- c o p o l y m e r s , p o l yv i n y l p y r r o l i d o n e , polyoxymethylcarboxylates, poly ( ⁇ -hydroxy-acrylate) , poly[ (3-hydroxymethyl)-hexamethylene-l,3,5-tricarboxyl] , poly [ (3-oxymethyl) -hexamethylene-1, 3 , 5-tricarboxyl] ,poly- [ (4-methoxy) -tetramethylene-1, 2-dicarboxylate] , poly-
• wash liquor additionally comprises a buffer.
• the buffer may suitably be a phosphate, borate, citrate, acetate, adipate, triethanolamine, monoethanola ine, diethanolamine, carbonate (especially alkali metal or alkaline earth metal, in particular sodium or potassium carbonate, or ammonium and HC1 salts) , diamine, especially diaminoethane, imidazole, or amino acid buffer.
• wash liquor additionally comprises a dispersing agent.
• the dispersing agent may suitably be selected from nonionic, anionic, cationic, ampholytic or zwitterionic surfactants. More specifically, the dispersing agent may be selected from carboxymethylcellulose, hydroxypropylcellulose, alkyl aryl sulphonates, long-chain alcohol sulphates (primary and secondary alkyl sulphates) , sulphonated olefins, sulphated onoglycerides, sulphated ethers, sulphosuccinates, sulphonated methyl ethers, alkane sulphonates, phosphate esters, alkyl isethionates, acyl sarcosides, alkyl taurides, fluorosurfactants, fatty alcohol and alkylphenol condensates, fatty acid condensates, condensates of ethylene oxide with an amine, condensates of ethylene oxide with an amide, block polymers (polyethylene glycol, polypropy
• Standard solutions of 20 mg Ca 2+ /ml (as CaCl 2 .2H 2 0) and 0.6 M EDTA (sodium salt, pH 7) were prepared and used in all the trials.
• Amounts of the Ca 2+ and EDTA solutions calculated to give the desired molar ratios of Ca 2+ to EDTA were pipetted into a glass beaker, and distilled water was added to 500 ml followed by mixing. The mixture was heated to 55-60"C for 20-30 minutes and cooled to below 30°C. The pH was adjusted to 6.9-7.1 with 1 N NaOH or IN HC1 after addition of the enzyme (1.5 ml enzyme/500 ml).
• the white fabric was rinsed thoroughly in distilled water. Fabric from different beakers was rinsed separately. The remission from the white fabric was measured on an Elrepho-photometer.
• the endoglucanase activity is determined as the viscosity decrease of a solution of carboxymethyl cellulose (CMC) after incubation with the enzyme under the following conditions:
• a substrate solution is prepared, containing 35 g/1 CMC (Hercules 7 LFD) in 0.1 M tris buffer at pH 9.0.
• the enzyme sample to be analyzed is dissolved in the same buffer..
• Viscosity readings are taken as soon as possible after mixing and again 30 minutes later.
• the amount of enzyme that reduces the viscosity by one half under these condi ⁇ tions is defined as 1 ECU) .

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Coloring (AREA)
• Detergent Compositions (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Enzymes And Modification Thereof (AREA)

Priority Applications (5)

Applications Claiming Priority (3)

Publications (1)

Family

ID=37087815

Family Applications (1)

Country Status (10)

Families Citing this family (2)

Citations (1)

Family Cites Families (3)

• 1993
  • 1993-02-26 DK DK93212A patent/DK21293D0/da not_active Application Discontinuation
• 1994
  • 1994-02-25 AU AU61392/94A patent/AU6139294A/en not_active Abandoned
  • 1994-02-25 US US08/507,286 patent/US5919272A/en not_active Expired - Fee Related
  • 1994-02-25 ES ES94908295T patent/ES2120016T3/es not_active Expired - Lifetime
  • 1994-02-25 DE DE69410996T patent/DE69410996T2/de not_active Expired - Fee Related
  • 1994-02-25 AT AT94908295T patent/ATE167246T1/de not_active IP Right Cessation
  • 1994-02-25 EP EP94908295A patent/EP0687319B1/en not_active Expired - Lifetime
  • 1994-02-25 JP JP6518574A patent/JPH08507832A/ja active Pending
  • 1994-02-25 WO PCT/DK1994/000078 patent/WO1994019528A1/en not_active Ceased
  • 1994-08-05 CN CN94115042A patent/CN1121971A/zh active Pending

Patent Citations (2)

Also Published As

Similar Documents

Legal Events