Claims
- 1. A method of reducing redeposition or backstaining of dye on dyed cellulose-containing fabric subjected to enzymatic stone-washing with a wash liquor containing cellulase, comprising reducing the concentration of di- or trivalent cation in the wash liquor to less than 20 mg/l.
- 2. The method of claim 1, wherein the divalent cation is Ca.sup.2+ or Mg.sup.2+.
- 3. The method of claim 2, wherein the Ca.sup.2+ concentration is reduced by the addition of a sufficient amount of a chelating agent to the wash liquor.
- 4. The method of claim 3, wherein the chelating agent is soluble and forms a complex with the cation at acid, neutral or alkaline pH values.
- 5. The method of claim 4, wherein the chelating agent is selected from aminocarboxylic acids; hydroxyamino-carboxylic acids; hydroxycarboxylic acids; phosphates, di-phosphates, tri-polyphosphates, higher poly-phosphates, pyro-phosphates; zeolites; polycarboxylic acids; carbohydrates, including polysaccharides; hydroxypyridinones; organic compounds comprising catechol groups; organic compounds comprising hydroxymate groups; silicates; or polyhydroxysulfonates.
- 6. The method of claim 5, wherein the chelating agent is an aminocarboxylic acid selected from EDTA (ethylene diamine tetra-acetic acid), DTPA (diethylene triamine penta-acetic acid), NTA (nitrilo triacetic acid), CDTA (trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid), EGTA (ethyleneglycol-O,O'-bis(2-aminoethyl)-N,N,N',N'-tetraacetic acid), or TTHA (triethylenetetraamine-N,N,N',N'-hexaacetic acid).
- 7. The method of claim 5, wherein the chelating agent is a hydroxyaminocarboxylic acid selected from HEDTA (hydroxyethylene diamine triacetic acid) DEG/DHEG (di-hydroxyethyl glycine), or HEIDA (N-(2-hydroxyethyl)-iminodiacetat).
- 8. The method of claim 5, wherein the chelating agent is a hydroxycarboxylic acid selected from gluconic acid, citric acid, tartaric acid, oxalic acid, diglycolic acid, or glucoheptonate.
- 9. The method of claim 5, wherein the chelating agent is selected from the group consisting of PBTC (phosphonobutantriacetat), ATMP (aminotri(methylenphosphonic acid)), DTPMP (diethylene triaminpenta-(methylenphosphonic acid), EDTMP ethylene diamintetra-(methylenphophonic acid)), HDTMP (hydroxyethylethylendiamin-tri(methylenphosphonic acid)), HEDP (hydroxyethane di-phosphonic acid), and HMDTMP (hexamethylen-diamine tetra-(methylene phosphonic acid)).
- 10. The method of claim 5, wherein the chelating agent is a polycarboxylic acid selected from the group consisting of maleic acid, itaconic acxid, mesaconic acid, fumaric acid, aconitic acid, citraconic acid, methylenemalonic acid, carboxymethyloxy-malonate, carboxympthyloxysuccinate, cis-cyclohexanehexa-carboxylate, ciscyclopentanetetracarboxylate, phloroglucinol trisulfonate, and polyacetal carboxylates.
- 11. The method of claim 10, wherein the polycarboxyl-ic acid is selected from the group consisting of polyacrylate, polymaleate, maleic-methylvinylether-copolymers, maleic-acrylic-copolymers, maleic-olefine-copolymers, polyvinylpyrrolidone, polyoxymethylcarboxylates, poly(O-hydroxy-acrylate), poly�(3-hydroxymethyl)-hexamethylene-1,3,5-tricarboxyl!, poly�(3-oxymethyl)-hexamethylene-1,3,5-tricarboxyl!, poly-�(4-methoxy)-tetramethylene-1,2-dicarboxylate!, poly-(tetra-methylene-1,2-dicarboxylate), poly(vinyl methyl ether-maleic anhydride), carboxymethyloxymalonate, carboxymethyloxysuccinate, and 1,2,3,4-cyclopentane-tetra-carboxylic acid.
- 12. The method of claim 11, wherein the cellulase is a fungal or bacterial cellulase.
- 13. The method of claim 12, wherein the cellulase is an acid cellulase.
- 14. The method of claim 13, wherein the acid cellulase is from a strain of Trichoderma, Irpex, Glostridium or Thermocellum.
- 15. The method of claim 3, wherein the cellulase is a neutral or alkaline cellulase.
- 16. The method of claim 15, wherein the cellulase is derived from a strain of Humicola, Fusarium, Bacillus, Cellulomonas, Pseudomonas, Myceliophthora or Phanerochaete.
- 17. The method of claim 1, wherein the liquor further comprises a buffer.
- 18. The method of claim 17, wherein the buffer is a phosphate, borate, citrate, acetate, adipate, triethanolamine, monoethanolamine, diethanolamine, carbonate, diamine, diaminoethane, imidazole, or amino acid buffer.
- 19. The method of claim 18, wherein the carbonate is sodium carbonate, potassium carbonate, ammonium carbonate, or chloride carbonate.
- 20. The method of claim 11, wherein the wash liquor further comprises a dispersing agent.
- 21. The method of claim 20, wherein the dispersing agent is selected from nonionic, anionic, cationic, ampholytic or zwitterionic surfactants.
- 22. The method of claim 21, wherein the dispersing agent is selected from the group consisting of carboxymethylcellulose, hydroxypropyl-cellulose, alkyl aryl sulphonates, long-chain alcohol sulphates, sulphonated olefins, sulphated monoglycerides, sulphated ethers, sulpho-succinates, 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, poly ethylene glycol, polypropylene glycol, ethylene diamine condensed with ethylene or propylene oxide, sucrose esters, sorbitan esters, alkyloamides, fatty amine oxides, ethoxylated monoamines, ethoxylated diamines, ethoxylated polyamines, ethoxylated amine polymers and mixtures thereof.
- 23. The method of claim 1, wherein the cellulose-containing fabric is denim.
- 24. The method of claim 11, wherein the cellulose-containing fabric is dyed with a vat dye, direct dye, sulphur dye or reactive dye.
- 25. The method of claim 3, wherein the molar ratio of di- or trivalent cation to chelating agent is 1:0.1-10.
- 26. The method of claim 25, wherein the molar ratio of di- or trivalent cation to chelating agent is 1:0.2-5.
Priority Claims (1)
Number |
Date |
Country |
Kind |
0212/93 |
Feb 1993 |
DKX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of PCT/DK94/00078 filed Feb. 25, 1994, which is incorporated herein by reference.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/DK94/00078 |
2/25/1994 |
|
|
9/18/1995 |
9/18/1995 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO94/19528 |
9/1/1994 |
|
|
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4912056 |
Olson |
Mar 1990 |
|
5213581 |
Olson et al. |
May 1993 |
|
5290474 |
Clarkson et al. |
Mar 1994 |
|
5538648 |
Buchelet et al. |
Jul 1996 |
|