EP0181257A1 - Process for the oxidation of sulphur dyestuffs - Google Patents

Process for the oxidation of sulphur dyestuffs Download PDF

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Publication number
EP0181257A1
EP0181257A1 EP85402090A EP85402090A EP0181257A1 EP 0181257 A1 EP0181257 A1 EP 0181257A1 EP 85402090 A EP85402090 A EP 85402090A EP 85402090 A EP85402090 A EP 85402090A EP 0181257 A1 EP0181257 A1 EP 0181257A1
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Prior art keywords
oxidation
vanadate
hydrogen peroxide
carried out
dyes
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EP85402090A
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German (de)
French (fr)
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EP0181257B1 (en
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Jean Balland
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Manufacture de Produits Chimiques Protex SARL
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    • 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
    • D06P1/22—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 vat dyestuffs including indigo
    • D06P1/222—Oxidising agents
    • 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
    • D06P1/30—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 sulfur dyes

Definitions

  • the present invention relates to an improvement made to the oxidation and fixing of sulfur dyes, or vat dyes.
  • halogenated derivatives are frequently recommended, in particular in the presence of alkaline vanadate; we know, however, that these different compounds are difficult to use with certain devices, such as the Jigger.
  • the Applicant has on the other hand experimentally found that the presence in a bath of hydrogen peroxide, of small quantities of a metal salt, such as copper sulphate, quantities insufficient to increase the speed of oxidation and allow the development of the various colors, and simultaneously the presence in the bath of small quantities of a vanadate, makes it possible to quickly oxidize all the colors without having the disadvantage of modifying their tone.
  • a metal salt such as copper sulphate
  • the present invention therefore relates to a process for the oxidation of sulfur dyes or tank dyes which makes it possible to avoid the various drawbacks mentioned and is characterized by the use of hydrogen peroxide solutions, added with small amounts of 'an alkaline vanadate and a metal salt, simultaneously present.
  • Oxidation is carried out in a relatively acidic medium, in a pH range between 3 and 6, at temperatures between 20 ° and 95 ° C and, preferably, between 40 0 and 60 ° C.
  • metallic salts the various compounds of copper, iron, nickel, cobalt or manganese can be used. Preference is given, however, according to the invention, to the use of copper salts, such as copper sulphate.
  • the vanadate can be chosen from the family comprising vanadates of alkali metals and ammonium vanadate.
  • the necessary quantities of hydrogen peroxide are between 0.1 g and 30 g / l, preferably between 1 g and 5 g of hydrogen peroxide per liter of oxidation bath.
  • the amount of vanadate will be between 0.05 and 0.5 g of vanadate per liter, preferably between 0.1 and 0.2 g / l.
  • the amounts of the metal salt chosen may vary between 0.01 g and 1 g / 1 with preferably 0.05 to 0.1 g, for example copper sulphate per liter of bath.
  • Oxidation is carried out for 15 seconds at a temperature of 50 ° C.
  • the operation is carried out under the same conditions by additionally introducing 0.2 g / l of sodium vanadate into the oxidizing bath.
  • Sample C Total and rapid oxidation.
  • the dyeing is carried out as in Example 1. After dyeing and rinsing, the sample is divided into four parts A, B, C, D, and the dye of these parts is oxidized by means of the respective baths. following:

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coloring (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

Process for the oxidation of sulphur dyes or vat dyes. The oxidation bath contains hydrogen peroxide, a metal salt, preferably a copper salt, and an alkaline vanadate.

Description

La présente invention concerne une amélioration apportée à l'oxydation et à la fixation des colorants au soufre, ou colorants de cuve.The present invention relates to an improvement made to the oxidation and fixing of sulfur dyes, or vat dyes.

On sait que l'oxydation, après teinture, des colorants au soufre ou colorants de cuve peut être réalisée à l'aide de différents agents d'oxydation. On peut, par exemple, citer parmi les composés les plus utilisés :

  • - Les chromates ou dichromates des métaux alcalins,
  • - Les composés halogénés des métaux alcalins tels que les bromates, chlorites ou iodates,
  • - Le peroxyde d'hydrogène.
It is known that the oxidation, after dyeing, of the sulfur dyes or tank dyes can be carried out using different oxidizing agents. One can, for example, mention among the most used compounds:
  • - Chromates or dichromates of alkali metals,
  • - Halogenated compounds of alkali metals such as bromates, chlorites or iodates,
  • - Hydrogen peroxide.

Cependant, l'emploi de chromates ou bichromates présente l'inconvénient de provoquer une pollution importante des eaux de rejet. On sait, en outre, que ces composés peuvent modifier de façon importante la tonalité de certains coloris ou provoquer également une diminution de l'hydrophilité des fibres.However, the use of chromates or dichromates has the drawback of causing significant pollution of the waste water. We also know that these compounds can significantly modify the tone of certain colors. or also cause a decrease in the hydrophilicity of the fibers.

L'emploi des dérivés halogénés est fréquemment préconisé, notamment en présence de vanadate alcalin ; on sait, toutefois, que ces différents composés sont difficilement utilisables avec certains appareils, tels que le Jigger.The use of halogenated derivatives is frequently recommended, in particular in the presence of alkaline vanadate; we know, however, that these different compounds are difficult to use with certain devices, such as the Jigger.

L'emploi de peroxyde d'hydrogène est efficace en milieu alcalin mais présente cependant l'inconvénient d'occasionner la suroxydation de nombreux colorants.The use of hydrogen peroxide is effective in an alkaline medium, but has the disadvantage of causing the over-oxidation of many dyes.

Quant à l'emploi de peroxyde d'hydrogène en milieu acide, il ne permet pas d'oxyder l'ensemble des colorants.As for the use of hydrogen peroxide in an acid medium, it does not allow all the dyes to be oxidized.

On sait que certains métaux sont susceptibles d'activer la décomposition d'une dilution aqueuse de peroxyde d'hydrogène et d'accrottre la vitesse de son pouvoir oxydant dans un domaine de pH acide. L'emploi de sels de fer, de nickel ou de cuivre par exemple, tels que le sulfate de cuivre, permet d'activer fortement la décomposition du peroxyde d'hydrogène. Toutefois, une telle oxydation, réalisée par exemple en présence de sels de cuivre, entraîne une modification importante des divers coloris.It is known that certain metals are capable of activating the decomposition of an aqueous dilution of hydrogen peroxide and of increasing the speed of its oxidizing power in a range of acid pH. The use of salts of iron, nickel or copper for example, such as copper sulphate, makes it possible to strongly activate the decomposition of hydrogen peroxide. However, such an oxidation, carried out for example in the presence of copper salts, results in a significant modification of the various colors.

D'autre part, l'emploi d'un vanadate dans un bain de peroxyde d'hydrogène ne permet pas d'accroître suffisamment la vitesse d'oxydation de la solution oxydante.On the other hand, the use of a vanadate in a hydrogen peroxide bath does not allow the rate of oxidation of the oxidizing solution to be increased sufficiently.

La demanderesse a par contre trouvé expérimentalement que la présence dans un bain de peroxyde d'hydrogène, de faibles quantités d'un sel métallique, tel que du sulfate de cuivre, quantités insuffisantes pour accroître la vitesse d'oxydation et permettre le développement des divers coloris, et simultanément la présence dans le bain de faibles quantités d'un vanadate, permet d'oxyder rapidement tous les coloris sans présenter l'inconvénient de modifier leur tonalité.The Applicant has on the other hand experimentally found that the presence in a bath of hydrogen peroxide, of small quantities of a metal salt, such as copper sulphate, quantities insufficient to increase the speed of oxidation and allow the development of the various colors, and simultaneously the presence in the bath of small quantities of a vanadate, makes it possible to quickly oxidize all the colors without having the disadvantage of modifying their tone.

Comparativement, l'application séparée de quantités identiques de sulfate de cuivre ou de vanadate ne permet pas d'oxyder aussi rapidement l'ensemble des divers colorants. Par contre, l'application simultanée d'un vanadate et d'un sel métallique en présence de peroxyde d'hydrogène permet d'oxyder rapidement l'ensemble des colorants au soufre, quel que soit le procédé de teinture ou l'appareillage considéré.In comparison, the separate application of identical amounts of copper sulphate or vanadate does not allow all the various dyes to be oxidized as quickly. On the other hand, the simultaneous application of a vanadate and a metal salt in the presence of hydrogen peroxide makes it possible to rapidly oxidize all of the dyes with sulfur, whatever the dyeing process or the apparatus considered.

La présente invention a donc pour objet un procédé d'oxydation des colorants au soufre ou colorants de cuve qui permet d'éviter les divers inconvénients mentionnés et se caractérise par la mise en oeuvre de solutions de peroxyde d'hydrogène, additionnées de faibles quantités d'un vanadate alcalin et d'un sel métallique, simultanément présents.The present invention therefore relates to a process for the oxidation of sulfur dyes or tank dyes which makes it possible to avoid the various drawbacks mentioned and is characterized by the use of hydrogen peroxide solutions, added with small amounts of 'an alkaline vanadate and a metal salt, simultaneously present.

On réalise l'oxydation en milieu relativement acide, dans un domaine de pH compris entre 3 et 6, à des températures comprises entre 20° et 95°C et, de préférence, entre 400et 60°C.Oxidation is carried out in a relatively acidic medium, in a pH range between 3 and 6, at temperatures between 20 ° and 95 ° C and, preferably, between 40 0 and 60 ° C.

Comme sels métalliques, on peut employer les différents composés du cuivre, du fer, du nickel, du cobalt ou du manganèse. La prÉférence est cependant donnée, selon l'invention, à l'emploi des sels de cuivre, tels que le sulfate de cuivre.As metallic salts, the various compounds of copper, iron, nickel, cobalt or manganese can be used. Preference is given, however, according to the invention, to the use of copper salts, such as copper sulphate.

Le vanadate pourra être choisi dans la famille comprenant les vanadates des métaux alcalins et le vanadate d'ammonium.The vanadate can be chosen from the family comprising vanadates of alkali metals and ammonium vanadate.

Les quantités nécessaires de peroxyde d'hydrogène sont cox- prises, selon l'invention, entre 0,1 g et 30 g/1, de préférence entre 1 g et 5 g de peroxyde d'hydrogène par litre de bain d'oxydation.According to the invention, the necessary quantities of hydrogen peroxide are between 0.1 g and 30 g / l, preferably between 1 g and 5 g of hydrogen peroxide per liter of oxidation bath.

La quantité de vanadate sera comprise entre 0,05 et 0,5 g de vanadate par litre, de préférence entre 0,1 et 0,2 g/l.The amount of vanadate will be between 0.05 and 0.5 g of vanadate per liter, preferably between 0.1 and 0.2 g / l.

Les quantités du sel métallique choisi pourront varier entre 0,01 g et 1 g/1 avec de préférence 0,05 à 0,1 g par exemple de sulfate de cuivre par litre de bain.The amounts of the metal salt chosen may vary between 0.01 g and 1 g / 1 with preferably 0.05 to 0.1 g, for example copper sulphate per liter of bath.

Grâce à l'invention, l'ensemble des colorants au soufre ou colorants de cuve, pourra être oxydé quel que soit le procédé de teinture, l'appareillage retenu ou la nature des des fibres teintes.Thanks to the invention, all of the sulfur dyes or tank dyes can be oxidized whatever the dyeing process, the equipment used or the nature of the dyed fibers.

Les exemples suivants permettront d'illustrer, de façon non limitative, les possibilités offertes par la présente invention. Dans les exemples ci-après, on utilise le Rouge au soufre n° 10 correspondant dans le Color Index au Numéro 53228. Ce colorant correspond à l'un des éléments difficilement oxydables et donnant le plus de difficultés au cours de l'oxydation.The following examples will illustrate, without limitation, the possibilities offered by the present invention. In the examples below, use the sulfur red No. 10 corresponding in the Color Index at Number 53228. This dye corresponds to one of the elements which are difficult to oxidize and which gives the most difficulty during oxidation.

EXEMPLE 1 :EXAMPLE 1:

On teint un tissu de coton, préalablement blanchi, avec 10 % de rouge au soufre n° 10 (pourcentage exprimé par rapport au poids de la fibre). On adopte les proportions suivantes pour le bain de teinture :

  • 10 % de colorant
  • 10 % de sulfure de sodium
  • 10 % de chlorure de sodium.
A cotton fabric, previously bleached, is dyed with 10% sulfur red No. 10 (percentage expressed relative to the weight of the fiber). The following proportions are adopted for the dye bath:
  • 10% dye
  • 10% sodium sulfide
  • 10% sodium chloride.

On adopte un rapport de bain de 1 à 10 entre le poids de la fibre et le volume du bain de teinture. On réalise la teinture pendant 1 heure à la température de 95°C. Après teinture, on rince à l'eau chaude puis froide, on divise l'échantillon en trois parties puis on procède à l'oxydation du colorant sur chacune de ces parties séparément en opérant comme suit :

  • A - On traite l'une des parties dans une solution contenant 2 g/1 de peroxyde d'hydrogène à 30 % et 10 cm3 d'acide acétique.
A bath ratio of 1 to 10 is adopted between the weight of the fiber and the volume of the dye bath. Dyeing is carried out for 1 hour at a temperature of 95 ° C. After dyeing, rinse with hot and then cold water, divide the sample into three parts and then proceed to the oxyda dye on each of these parts separately by operating as follows:
  • A - One of the parts is treated in a solution containing 2 g / 1 of 30% hydrogen peroxide and 10 cm 3 of acetic acid.

On réalise l'oxydation pendant 15 secondes à la température de 50°C.Oxidation is carried out for 15 seconds at a temperature of 50 ° C.

B - Pour la deuxième partie, on opère dans les mêmes conditions en introduisant en plus dans le bain oxydant 0,2 g/1 de vanadate de sodium.B - For the second part, the operation is carried out under the same conditions by additionally introducing 0.2 g / l of sodium vanadate into the oxidizing bath.

C - Pour la troisième partie, on adopte des conditions identiques mais en introduisant dans le bain, conformément à l'invention, 2 g/1 de chlorite de sodium à 30 % et 0,2 g/l de vanadate de sodium.C - For the third part, identical conditions are adopted but by introducing into the bath, in accordance with the invention, 2 g / l of 30% sodium chlorite and 0.2 g / l of sodium vanadate.

On observe les résultats suivants :

  • Echantillons A et B : Oxydation très lente, nettement insuffisante, ne permettant pas d'oxyder le coloris,
The following results are observed:
  • Samples A and B: Very slow oxidation, clearly insufficient, not allowing the color to be oxidized,

Echantillon C : Oxydation totale et rapide.Sample C: Total and rapid oxidation.

EXEMPLE 2 :EXAMPLE 2:

On procède à la teinture comme dans l'exemple 1. Après teinture et rinçage, on divise l'échantillon en quatre parties A, B, C, D, et on procède à l'oxydation du colorant de ces parties au moyen des bains respectifs suivants :

Figure imgb0001
Figure imgb0002
Figure imgb0003
Figure imgb0004
 The dyeing is carried out as in Example 1. After dyeing and rinsing, the sample is divided into four parts A, B, C, D, and the dye of these parts is oxidized by means of the respective baths. following:
Figure imgb0001
Figure imgb0002
Figure imgb0003
Figure imgb0004

Pour tous ces bains, on adopte les conditions suivantes :

  • - Température 50°C
  • - Rapport de bain 1 à 20 (rapport entre le poids de la fibre et le volume du bain).
For all these baths, the following conditions are adopted:
  • - Temperature 50 ° C
  • - Bath ratio 1 to 20 (ratio between the weight of the fiber and the volume of the bath).

On observe une vitesse d'oxydation insuffisante avec les bains A, B et C, l'oxydation totale du coloris n'est, par exemple, pas réalisée après 30 secondes de traitement.An insufficient oxidation rate is observed with baths A, B and C, the total oxidation of the color is, for example, not carried out after 30 seconds of treatment.

Comparativement, l'oxydation réalisée en D est nettement plus rapide ; on observe, en effet, dans ce cas, une oxydation totale après 10 secondes de traitement ; on constate également que le coloris n'a subi aucune modification de tonalité.Comparatively, the oxidation carried out in D is much faster; indeed, in this case, total oxidation is observed after 10 seconds of treatment; we also note that the color has not undergone any change in tone.

EXEMPLE 3 :EXAMPLE 3:

On reprend les conditions précédentes. On réalise l'oxydation sur trois parties séparées des fibres teintes et rincées, en utilisant respectivement les bains suivants :

Figure imgb0005
We take the previous conditions. The oxidation is carried out on three separate parts of the dyed and rinsed fibers, using the following baths respectively:
Figure imgb0005

Après traitement, l'oxydation réalisée avec les bains A et C est nettement insuffisante. Comparativement, l'oxydation réalisée en C est nettement plus rapide. On constate, cependant, dans ce dernier cas, que le coloris subit un bleuissement important et n'est plus conforme aux spécifications du colorant considéré. On remarque que dans cet exemple il n'y a pas de vanadate dans la composition du bain.After treatment, the oxidation carried out with baths A and C is clearly insufficient. Comparatively, the oxidation carried out in C is much faster. It is noted, however, in the latter case, that the color undergoes significant bluing and no longer complies with the specifications of the dye considered. Note that in this example there is no vanadate in the composition of the bath.

EXEMPLE 4 :EXAMPLE 4:

On réalise une teinture sur Jigger avec 10 % de colorant.We make a dye on Jigger with 10% dye.

Après teinture, on réalise l'oxydation en opérant dans les conditions comparatives suivantes :

  • A. Rinçage par Jigger à l'aide de deux passages dans de l'eau froide.
After dyeing, the oxidation is carried out by operating under the following comparative conditions:
  • A. Rinse with Jigger using two passes in cold water.

B. Oxydation sur Jigger avec :

Figure imgb0006
B. Oxidation on Jigger with:
Figure imgb0006

On réalise deux passages à la température de 50°C. On observe une oxydation rapide et totale de l'ensemble de la matière teinte.Two passages are made at a temperature of 50 ° C. A rapid and total oxidation of all the dyed material is observed.

C. On adopte les mêmes conditions mais réalise l'oxydation avec un bain dépourvu de peroxyde d'hydrogène et contenant :

Figure imgb0007
C. The same conditions are adopted but the oxidation is carried out with a bath devoid of hydrogen peroxide and containing:
Figure imgb0007

On observe, dans ce cas, une oxydation très nettement incomplète de la matière teinte quel que soit le nombre de passages effectués dans le bain oxydant.In this case, very clearly incomplete oxidation of the dyed material is observed regardless of the number of passages made in the oxidizing bath.

Les exemples qui précèdent montrent l'efficacité de l'action combinée du peroxyde d'hydrogène, d'un sel métallique et d'un vanadate alcalin, présents simultanément dans le bain d'oxydation.The foregoing examples show the effectiveness of the combined action of hydrogen peroxide, a metal salt and an alkaline vanadate, present simultaneously in the oxidation bath.

Claims (13)

1. Procédé d'oxydation des colorants au soufre ou colorants de cuve en présence d'une solution de peroxyde d'hydrogène, caractérisé en ce que cette solution est activée à l'aide d'un sel métallique et d'un vanadate alcalin agissant en combinaison.1. Process for the oxidation of sulfur dyes or vat dyes in the presence of a hydrogen peroxide solution, characterized in that this solution is activated using a metal salt and an acting alkaline vanadate in combination. 2. Procédé selon la revendication 1, caractérisé en ce que le sel métallique pourra être choisi parmi les différents sels du fer, du cuivre, du nickel, du cobalt et du manganèse avec une préférence pour l'emploi des sels de cuivre.2. Method according to claim 1, characterized in that the metal salt may be chosen from the various salts of iron, copper, nickel, cobalt and manganese with a preference for the use of copper salts. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le vanadate est choisi dans la famille comprenant les vanadates alcalins et le vanadate d'ammonium.3. Method according to claim 1 or 2, characterized in that the vanadate is chosen from the family comprising alkaline vanadates and ammonium vanadate. 4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la quantité de sels métalliques est comprise entre 0,01 et 1 g par litre de bain oxydant.4. Method according to one of claims 1 to 3, characterized in that the amount of metal salts is between 0.01 and 1 g per liter of oxidizing bath. 5. Procédé selon la revendication 4, caractérisé en ce que la quantité de sel métallique est comprise entre 0,05 et 0,1 g/l.5. Method according to claim 4, characterized in that the amount of metal salt is between 0.05 and 0.1 g / l. 6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les quantités de vanadate sont comprises entre 0,05 et 0,5 g/1.6. Method according to one of claims 1 to 5, characterized in that the amounts of vanadate are between 0.05 and 0.5 g / 1. 7. Procédé selon la revendication 6, caractérisé en ce que les quantités de vanadate sont comprises entre 0,1 et 0,2 g/1.7. Method according to claim 6, characterized in that the amounts of vanadate are between 0.1 and 0.2 g / 1. 8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la quantité de peroxyde d'hydrogène est comprise entre 0,1 et 30 g/1.8. Method according to one of claims 1 to 7, characterized in that the amount of hydrogen peroxide is between 0.1 and 30 g / 1. 9. Procédé selon la revendication 8, caractérisé en ce que la quantité de peroxyde d'hydrogène est comprise entre 1 et 5 g/1.9. Method according to claim 8, characterized in that the amount of hydrogen peroxide is between 1 and 5 g / 1. 10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'oxydation est réalisée en milieu acide, dans un domaine de pH compris entre 3 et 6.10. Method according to one of claims 1 to 9, characterized in that the oxidation is carried out in an acid medium, in a pH range between 3 and 6. 11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que l'oxydation est réalisée à une température comprise entre 20 et 95°C.11. Method according to one of claims 1 to 10, characterized in that the oxidation is carried out at a temperature between 20 and 95 ° C. 12. Procédé selon la revendication 11, caractérisé en ce que l'oxydation est réalisée à une température comprise entre 40 et 60°C.12. Method according to claim 11, characterized in that the oxidation is carried out at a temperature between 40 and 60 ° C. 13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que le colorant est du Rouge au soufre n° 10.13. Method according to one of claims 1 to 12, characterized in that the dye is Red sulfur # 10.
EP19850402090 1984-10-31 1985-10-30 Process for the oxidation of sulphur dyestuffs Expired EP0181257B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416681 1984-10-31
FR8416681A FR2572416B1 (en) 1984-10-31 1984-10-31 IMPROVEMENT IN THE SULFUR DYE OXIDATION PROCESS

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EP0181257A1 true EP0181257A1 (en) 1986-05-14
EP0181257B1 EP0181257B1 (en) 1988-09-14

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WO (1) WO1986002676A1 (en)

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JPH03134344A (en) * 1989-10-18 1991-06-07 Mitsubishi Heavy Ind Ltd Gear

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FR1421707A (en) * 1963-12-19 1965-12-17 Du Pont Oxidation of sulfur dyes
US4036586A (en) * 1975-10-16 1977-07-19 E. I. Du Pont De Nemours And Company Process for oxidizing sulfur dyes
DE2914260A1 (en) * 1979-04-09 1980-10-23 Cassella Ag Textile dyeing and printing comprising dye re-oxidn. - in aq. bath contg. soluble vanadate, tungstate or molybdate accelerator and peroxide
EP0034005A1 (en) * 1980-02-07 1981-08-19 Interox Chemicals Limited Process for oxidation of dyestuffs

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Publication number Priority date Publication date Assignee Title
FR1421707A (en) * 1963-12-19 1965-12-17 Du Pont Oxidation of sulfur dyes
US4036586A (en) * 1975-10-16 1977-07-19 E. I. Du Pont De Nemours And Company Process for oxidizing sulfur dyes
DE2914260A1 (en) * 1979-04-09 1980-10-23 Cassella Ag Textile dyeing and printing comprising dye re-oxidn. - in aq. bath contg. soluble vanadate, tungstate or molybdate accelerator and peroxide
EP0034005A1 (en) * 1980-02-07 1981-08-19 Interox Chemicals Limited Process for oxidation of dyestuffs

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* Cited by examiner, † Cited by third party
Title
JOURNAL OF THE SOCIETY OF DYERS AND COLOURISTS, vol. 98, no. 4, avril 1982, pages 106-113, Bradford, Yorkshire, GB; R. KLEIN: "Sulphur dyes today and tomorrow" *

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JPS61502065A (en) 1986-09-18
EP0181257B1 (en) 1988-09-14
FR2572416B1 (en) 1987-09-04
WO1986002676A1 (en) 1986-05-09
JPS6356354B2 (en) 1988-11-08
DE3564972D1 (en) 1988-10-20
FR2572416A1 (en) 1986-05-02

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