EP3622110B1 - Coloring product, in particular for dyeing or refreshing dyes in textile materials with indigo dyes - Google Patents

Description

The present invention relates to a dye-releasing product, in particular for dyeing or refreshing dyeings in textile materials, in particular jeans or denim materials, preferably in a washing machine, comprising a flat, cloth-like carrier material, a method for dyeing or refreshing Colorings in textile materials and uses for this.

Textile products in the form of cloths are known from the prior art, which prevent graying of white or light-colored laundry, that is, textile, soiled materials. Such textile products have, for example, cationic resins or substances with a similar effect which, in combination with other substances, prevent laundry from graying even after repeated washing processes.

The reverse is the case with dark, in particular blue or red items of laundry, in particular those made of jeans or denim materials. These, too, can slowly fade after repeated washing. So-called black detergents are known here, which help to prevent dark laundry from fading. Such black detergents are used like customary liquid detergents for washing, especially in washing machines. However, the mode of action of the known black detergents available on the market is not such that the fading, in particular of dark laundry, can be stopped permanently.

DE 103 60 842 A1 discloses a detergent system with delayed colorant action with molded articles containing products with delayed release of colorants during use, the molded article and / or its outer molded body shell, which dissolves when used, at least one thermoplastic water-soluble polymer, at least one ionic polymer non-complexing salt, at least one colorant, the colorant having at least two ionic groups that form the water-soluble polymer complex reversibly, and the colorant has a textile-coloring and / or textile-color-refreshing effect, and comprises at least one colorant-absorbing particulate carrier material. The particulate carrier material is preferably zeolite.

WO 2017/0506446 A1 discloses a method for dyeing textile fabrics or made-up textiles, which makes it possible to imitate demin-typical surface features on textile fabrics or made-up textiles. JP H09 132879 A discloses the dyeing of polyester textile products with vaporized indigo. DE 10 2015 218 190 A1 discloses a surfactant-containing composition for treating textiles with dye. JP H06 287870 A deals with a method for wet transfer printing with a resin. JP 3 11 3218 B2 discloses an inner container and an outer container comprising indigo. DE 10 2004 051 582 A1 discloses the dyeing of cellulosic textile material by indigo in an unreduced form by sublimation / evaporation.

In the case of items of laundry made from jeans or denim material, there is also another problem, namely to maintain the jeans character. Jeans materials often have their own unique character, which would be lost if they were colored with a common, for example blue, dye. An appropriately colored piece of jeans underwear would then have the character of blue work trousers rather than jeans.

There is therefore a need to stop the fading of dark, in particular denim, laundry or at least to slow down the fading in view of repeated washing processes without impairing the character of the item of laundry.

The object of the present invention is therefore to provide a product which prevents the fading of darker laundry, in particular of jeans, even after repeated washing processes.

This object is achieved according to the invention by a dye-releasing product for dyeing or refreshing dyeings in textile materials, preferably in a washing machine, comprising a flat, cloth-like carrier material, at least one coating applied to the carrier material and at least one indigoid dye comprised by the coating in oxidized form, wherein the coating further comprises at least one binder for the at least one dye, so that the at least one dye starts at a temperature of about 20 ° C in an aqueous solution, the coating being at least partially detachable from the flat carrier material that is added to the textile material to be dyed or refreshed in the dyeing process. Insofar as the present invention refers to indigoid dye or even just dye in the following, this always means an indigoid dye in oxidized form. The same also applies with regard to the fact that in the following in connection with the invention only a flat carrier material or only a carrier material is referred to, which always means a flat, cloth-like material in the context of the present invention. The color-releasing product according to the invention can be used for dyeing textile materials, but preferably for freshening up colorations in textile materials. Textile materials according to the present invention are in particular those made from cotton, natural fibers or polyamide or mixtures of the aforementioned materials. Jeans or denim materials are particularly preferred. Denim materials are particularly characterized by the fact that either only the weft thread or only the warp thread is colored. The color-releasing product according to the invention is preferably not a detergent in the sense that it cleans the laundry. Rather, it dyes the laundry or refreshes an existing coloration of textile materials in the laundry.

If conventional dyes, for example a blue dye in the case of a blue piece of jeans, were used to freshen up or color the same, the result would be a uniform dyeing result, so that the jeans character would be lost. In the context of the present invention, dyeings are refreshed if fading of dark, in particular jeans, laundry is prevented, i.e. the fading slows down or fading is even stopped or stopped when the textile materials in question are washed several times faded laundry again becomes more intense in color. According to the spirit and purpose of the present invention, the dye-releasing product is free from dye traps, for example free from polyvinylpyrrolidones with dye trapping effects or properties.

Washing tests with the product according to the invention, equipped with dark or blue or red indigoid dye or dye mixtures, have shown that, even after washing dark or denim textiles twenty times, the fading of the same is significantly reduced or even stopped, whereas in a comparative test after twenty times washing clear fading of blue or red jeans textiles was noticeable without adding the color-releasing product.

The product according to the invention consists essentially of a flat, cloth-like carrier material and a coating applied to it. The at least one indigoid dye is preferably present in the coating in oxidized form. The flat, cloth-like carrier material can also be referred to as a dye cloth. The size of the flat carrier material can be freely selected and, depending on this, also the amount of the applied coating including the at least one dye comprised by it. For example, sizes of 10 x 10 cm or 13.5 x 19.5 cm are conceivable for the flat carrier material. In the case of color blankets of these sizes, the amount of coating can be in a range from approximately 200 mg to approximately 7,000 mg, preferably in a range from approximately 350 mg to approximately 2,000 mg. In the coating present on the flat carrier material, quantities of the at least one dye are advantageously in a range from about 80 mg, preferably from about 100 mg, to about 1,000 mg, preferably in a range from about 110 mg to about 600 mg. What is particularly preferred about the product according to the invention is that it advantageously appears very light or white instead of a dark, especially blue or red color, depending on the flat carrier material used, after use when it is removed from a washing machine, for example, and thus the actual color of the flat carrier material is clear is visible. This gives the user immediate feedback on the effectiveness of the product according to the invention. This has its basis in the fact that the on the flat carrier material applied coating is peeled off during use and at least partially releases the dye.

According to the invention, the coating comprises at least one binder for the at least one dye, so that the at least one dye can be released into an aqueous solution from a temperature of about 20 ° C. The at least one dye is preferably released or released in that the coating is at least partially detached from the flat carrier material in a washing process, so that the binder is also at least partially detached from the flat carrier material. Due to the release or release of the at least one dye, after a washing process, a light-colored, for example a white or almost white, used product when using a white-colored flat carrier material is obtained, from which the user of the color-releasing product according to the invention can immediately see its function and effect.

The at least one dye is preferably released into an aqueous solution in a temperature range from about 25 ° C. to about 95 ° C., more preferably in a temperature range from about 30 ° C. to about 65 ° C.. The aqueous solution is particularly preferably made alkaline. The aqueous solution particularly preferably has a pH in a range from about 7 to about 14, more preferably in a range from about 7.5 to about 13. The aqueous solution particularly preferably contains a detergent, preferably a powder detergent. The coating is particularly preferably designed in such a way that when the color-releasing product according to the invention is used by the user, when the user hands the product into the hand and, for example, into a washing machine to carry out a washing process, the coating does not become detached from the flat carrier material and in particular the at least one dye is not transferred to the user's hand. The coating on the at least one flat carrier material can be one or more layers, for example two or three layers and, for example, sprayed with a doctor blade or applied to the flat material with a dyeing machine. In the case of multiple coatings, the amount of dye on the sheet-like carrier material can be increased so that the amount of the same on the material can easily be increased in one production process. The coating can moreover be carried out on one or on both sides of the flat carrier material. However, this is preferably only applied to one side of the flat carrier material. The coating can, for example, also be carried out in the form of a design, for example a company logo or the like.

The at least one binder is preferably selected from a group comprising natural and / or synthetic resins, gum arabic, guar gum, gelatin, dextrins, agar agar, alginic acid, alginates, carrageenan, egg white, gellan, locust bean gum, pectin, modified cellulose, starch, modified Starch and / or xanthan gum. The at least one binder is particularly preferably selected from the group of synthetic resins comprising polyesters, polyvinyl acetates, polyacrylates, polyclycols, polyvinyl alcohols and / or polyvinylpyrrolidones (PVP) and / or mixtures of the polymers mentioned, the aforementioned polymers not having any color-catching effect or properties . The synthetic resins are particularly preferably nonionic or anionic. Gum arabic is also particularly suitable as a binding agent. The at least one binder is very particularly preferably selected from a group comprising polyesters and / or polyvinyl acetates, which are more preferably present as an aqueous dispersion and are even more preferably nonionic. The binder is very particularly preferably formed from the mixture of a polyvinyl acetate and a polyester.

The at least one binder is preferably present in an amount in a range from about 1% by weight to about 50% by weight, based on the total amount of the coating. In particular if the at least one binder is selected from the group of natural substances, such as gum arabic, gelatin, gellan, etc., this is further in an amount in a range from about 1.5% by weight to about 10% by weight preferably in a range from about 2.2% by weight to about 6% by weight, based on the total amount of the coating, present therein. In particular when the at least one binder is selected from a group of natural and / or synthetic resins, in particular selected from the synthetic resins, more preferably those mentioned above as preferred, also in mixtures, the at least one binder is in an amount in a range of about 2.5% by weight, preferably about 4% by weight, up to about 49% by weight, more preferably in an amount in a range from about 8% by weight to about 40% by weight, based on the total amount of the coating present therein. If at least two binders are present in the coating, each of these is in an amount in a range from about 2% by weight to about 35% by weight, more preferably in an amount in a range up to about 29% by weight. %, based on the total amount of the coating, present in the coating. If a polyester and a polyvinyl acetate, as described above as preferred, are used as binders, the polyester is preferably in an amount in a range from about 10% by weight, preferably from about 15% by weight, to about 35% by weight. %, preferably in an amount in a range from about 12% by weight, preferably from about 20% by weight, to about 32% by weight, based on the total amount of the coating, and the polyvinyl acetate in an amount in a range from about 4% by weight to about 20% by weight, preferably in an amount in a range from about 6% by weight to about 18% by weight, based on the total amount of the coating present therein.

The coating preferably comprises at least two binders, in particular those as described above. Particularly preferably, a first binder, which is preferably a polyvinyl acetate, has a pH value in a range from about 3.5 to about 5.5 and a second binder, which is preferably a polyester, has a pH value in a range of about 5.6 to about 9. The at least one binder is particularly preferably non-ionic.

The at least one indigo dyestuff in oxidized form is particularly preferably selected from a group comprising indigo, indigo rubine, indigo carmine, purple and their derivatives. Exemplary derivatives are brilliant indigo 4B (Cibablau 2B) or thioindigo. Indigo is particularly preferred. Indigo is also known by the chemical name 2, 2 'bis (2,3-dihydro-3-oxoindolylidene). The indigoid dyes used according to the invention in oxidized form are distinguished by the fact that they are only slightly or slightly soluble in Are water. They are preferably grainy. They can therefore also be addressed as color pigments. They therefore have pigment-like properties. It is known from the prior art to use the named dyes as so-called vat dyes, these being first reduced and then applied to the textile material and finally being oxidized again. Indigo, for example, is first converted into the slightly yellowish indigo white (reduced form) and then oxidized again to blue indigo. The indigoid dyes used according to the invention in oxidized form are preferably nonionic. These are particularly preferably not functionalized, in particular not with ionic groups. They preferably have no ionic groups. They preferably do not react with other constituents of the color-releasing product according to the invention. Surprisingly, it has been shown that when the oxidized form is used immediately in the coating of the color-releasing product according to the invention, very good results are obtained with regard to the refreshing of colors or dyes of items of laundry, in particular of jeans items of laundry in blue or red coloration typical jeans character retained.

According to the invention, the at least one indigoid dye is in oxidized form in an amount in a range from about 30% by weight, preferably from about 40% by weight to about 98% by weight, preferably in a range from about 45% by weight. %, more preferably from about 50% by weight to about 97% by weight, more preferably up to about 70% by weight, based in each case on the total amount of the coating, in this. If a natural binder such as gum arabic, gelatine, gellan or the like, but not a natural and / or synthetic resin, is used as the binder, the amount of the at least one dye used is advantageously in a range from about 70% by weight to about 98 % By weight, more preferably in a range from about 78% by weight to about 97.8% by weight, based in each case on the total amount of the coating. If the at least one binder is selected from a group comprising natural and / or synthetic resins, preferably synthetic resins, in particular those which are described above as particularly preferred, also in combination with one another, the at least dye is in an amount in a range of about 30% by weight, preferably from about 48% by weight, to about 80% by weight, more preferably in an amount in a range from about 52% by weight to about 70% by weight, based in each case on the total amount of the coating, in this.

The at least one indigoid dye particularly preferably has a pH in a range from about 6 to about 11, more preferably in a range from about 6.5 to about 8.5. The at least one indigoid dye is preferably present in oxidized form in pigment form, that is to say in granular form. More preferably, the at least one indigoid dye in oxidized form has a particle size in a range of 1.5 μm, more preferably a particle size in a range from about 0.05 μm to about 1.5 mm, even more preferably up to 1 μm, on. If the indigoid dye is present in the aforementioned orders of magnitude or ranges, in particular in a mixture with the at least one binder, in particular in the form of a coating on a cloth-like carrier material, the coloring effect or the refreshment of the coloring is further improved, and smaller amounts can also be used to be used in dye. The at least one indigoid dye is preferably present in oxidized form in granular form in the at least one binder, in particular in the form of a coating on a cloth-like carrier material.

To the extent that values or value ranges are further characterized by the term “approximately” within the scope of the present invention, this is to be understood as a tolerance range which the person skilled in the art in this field considers to be common. In particular, a tolerance range with respect to the specified values or value ranges of + - 20%, preferably + - 10%, more preferably + -5%, and even more preferably + - 2% is provided. The values and / or value ranges specified in the present invention can therefore change upwards or downwards by the above-mentioned tolerance ranges without going beyond the scope of the present invention.

At least two indigoid dyes are particularly preferably provided in the coating. It is very particularly preferred that exactly two dyes are provided in the coating. In a particularly preferred embodiment, the coating has a blue color such as indigo and a reddish color such as indigo carmine. So far at least two If dyes are provided in the coating, these are each in an amount in a range from about 15% by weight to about 49% by weight, preferably each in an amount in a range from about 25% by weight to about 49% by weight .-%, based in each case on the total amount of the coating, in this. If exactly two dyes are present in the coating, they can particularly preferably be present in identical amounts in it. Different amounts of at least two indigoid dyes are present in particular when the binder is selected from a group comprising natural and / or synthetic resins, in particular the preferred resins mentioned above or mixtures thereof. If at least one blue, preferably exactly one blue, indigoid dye, in particular indigo in oxidized form, is provided, this is preferably in the coating in an amount in a range from about 28% by weight to about 75% by weight, preferably in a range from about 50% by weight to about 70% by weight, based in each case on the total amount of the coating, of this.

The parameters defined above advantageously lead to the fact that no dust formation occurs on the flat, cloth-like carrier material due to the coating applied to it, in particular due to the at least one indigoid dye comprised by this in oxidized form. Particularly in the event of kinking or other deformation of the flat carrier material, the preferred parameters mentioned relating to the dye, but also to the binder, reliably prevent the coating from crumbling on the flat carrier material. The binder advantageously serves to prevent the indigoid dye from crumbling on the flat product, in particular in the form of the preferred or particularly preferred binders set out above. In this way, it is also possible to avoid the color on the hands of the user, and consequently a sufficiently firm adhesion of the indigoid dye to the flat carrier material can be achieved.

The ratio of the amount of the at least one binder to the at least one indigoid dye in the coating on the color-releasing product according to the invention is in a range from about 1: 1 to about 1: 5, preferably in a range from about 1: 1.25 to about 1: 3.

The coloring product according to the invention can moreover advantageously comprise at least one thickener in the coating. The at least one thickener is advantageously used to adjust the viscosity, depending on the use of the binders or dyes used. The at least one thickener is particularly preferably selected from a group comprising polyacrylates, in particular those in an aqueous dispersion. The polyacrylate is preferably anion-active. The polyacrylate is more preferably not color-catching. The pH of the at least one thickener is advantageously in a range from about 1.5 to about 6, preferably in a range from about 1.8 to about 4.5. The at least one thickener is advantageously used in a range from about 1% by weight to about 3.5% by weight, preferably up to about 2% by weight, based on the total amount of the coating.

In a further preferred embodiment of the invention, the color-releasing product comprises urea in an amount in a range from about 2% by weight to about 30% by weight, more preferably in an amount in a range from about 4% by weight to about 27% by weight, based in each case on the total amount of the coating on the color-releasing product. The urea serves to keep the viscosity more or less constant when the coating is applied to a flat carrier material and thus in particular to prevent the coating compound from thickening after it has been applied to the fleece.

The ink-releasing product according to the invention can also advantageously comprise at least one dispersant, at least one wetting agent, at least one complexing agent and / or at least one anti-flocculant in the coating. The aforementioned agents are particularly suitable for providing the at least one indigoid dye in oxidized form in the coating compositions to be produced for the coating, which are described below, so that optimal coloring results are achieved, and in particular this in a preferably aqueous solution finely distributed. For this purpose, the at least one dispersant is particularly useful. In a particularly preferred embodiment of the present invention, however, the color-releasing product in the coating and also the coating composition according to the invention described further below do not comprise any of the aforementioned agents, or at least at least one dispersant.

According to the invention, the at least one flat carrier material is a nonwoven fabric. The flat, cloth-like carrier material is preferably white or has a light color.

The flat, cloth-like carrier material is preferably made from fibers which are not directly colored by the at least one indigoid dye. The at least one flat carrier material is particularly preferably one which gives off dyes applied to it well, that is to say that they can be detached from it easily to very well, preferably at least partially together with the coating.

Preference is given to using predominantly synthetic fibers to form the fleece, preferably polymer fibers and / or combinations of natural and synthetic fibers. The flat carrier material preferably has a flexible character, it has good grip properties and can be easily handled by the user. For the production of a preferred polymer-based nonwoven fabric for the purposes of the present invention, any thread-forming polymers which, in their melt or solution, have properties which meet the requirements for spinnability can be used. For example, polymers from the group of polyolefins as homopolymers or blends, polyamides, polyesters, degradable polymers, for example based on polylactic acid or starch, are suitable for producing these nonwovens. Polyolefin-based nonwovens have proven to be particularly advantageous for the flat carrier material, the flat carrier material being particularly preferably a viscose-polyester nonwoven. The flat carrier material and thus the preferred fleece can be designed in one or more layers. Single-layer materials can, for example, consist of fibers and / or filaments, of staple or continuous threads, which are produced, for example, by a spunbond process or meltblown process or Carding processes or a wet spinning process can be used to produce the flat carrier material. Multi-layer nonwovens can be formed, for example, on a polymer basis, with intermediate layers also being able to be formed which are predominantly or completely formed from fibers other than the outer layers and, for example, can also be formed from natural or degradable fibers. As an alternative to the nonwovens preferred for the purposes of the present invention as flat carrier materials, porous film layers can also be used. Usual weights per unit area of the nonwovens or porous film layers for forming a flat carrier material are between about 10 g / m ² to about 200 g / m ² , preferably in a range between about 25 g / m ² to about 100 g / m ² . Multi-layer structures can be produced in separate processing processes or in one processing process, for example inline. The fiber or filament diameter of a nonwoven preferably used according to the invention can be in a range from less than about 0.001 mm to more than about 0.2 mm, the fiber cross-sections being round, non-round, for example elliptical, rectangular, polygonal or multilobal, preferably trilobal can. The fibers and / or filaments can be designed as monofilaments or multi-component filaments. The fibers can be bonded within the fleece by thermobonding, adhesive bonding, for example by means of hot-melt adhesive or needling, hydroentanglement or the like.

Both the design of the fiber cross-sections, the thickness and the layer structure of the flat carrier material as well as the combination of natural and / or synthetic fibers have an influence on increasing the color transferability of the at least one dye or the at least one coating of the product according to the invention. The flat material can also be made from different materials and, for example, also have a lamination on one side with, for example, a colorant-impermeable foil or film, so that the risk of discoloration when the user is using it is reduced. If a viscose-polyester fleece is used, this can have equal proportions of viscose and polyester. However, it can also be provided that one of the two constituents is present in a larger amount than the other.

Accordingly, in the particularly preferred viscose-polyester nonwoven, the proportion of viscose can be in a range from about 40% by weight to about 50% by weight, the proportion of polyester in a range from about 40% by weight to about 60% % By weight, each based on the total amount of the fleece. The thickness of the flat carrier material is preferably in a range between approximately 0.2 mm and approximately 1.2 mm, preferably in a range between approximately 0.35 mm and approximately 0.8 mm. Alternative nonwoven materials can for example consist of polyethylene or polypropylene or mixtures of these.

Particularly preferably, the sheet-like carrier material cannot be colored by the at least one indigoid dye. This preferably leads to the effect that, after a washing process has been carried out, the user can, for example, remove the flat carrier material from the washing machine in a light or white form, so that the user immediately has an impression of the effect of the product according to the invention used.

The cloth according to the invention preferably has a coating which contains about 1% by weight to about 3.5% by weight, preferably about 2% by weight to about 3% by weight, gum arabic as a binder and about 96% by weight. -% to about 98.5% by weight of at least one indigoid dye, each based on the total amount of the coating. Another preferred composition of the coating on the flat carrier material of the product according to the invention has about 18% by weight, preferably about 30% by weight, to about 46% by weight of at least one binder, preferably an amount in a range of about 35% by weight .-% to about 44 wt .-%, each based on the total amount of the coating. The at least one binder is preferably selected from two binders, namely one polyester and one polyvinyl acetate, as described above. A polyester as a binder is preferably present in an amount in a range from about 12% by weight, preferably from about 15% by weight, to about 35% by weight, based on the total amount of the coating. A polyvinyl acetate is advantageously present in an amount in a range from about 8% by weight to about 20% by weight, based on the total amount of the coating. In this mixture there is advantageously at least one indigoid dye in oxidized form in an amount in one range from about 30% by weight, preferably from about 50% by weight, to about 70% by weight, more preferably in an amount in a range from about 55% by weight to about 65% by weight, based on the Total amount of coating, before. Precisely one dye or precisely two dyes are particularly preferred by the coating. In addition, the coating can also include a thickener, preferably in an amount in a range from about 5% by weight to about 30% by weight, preferably up to about 15% by weight, based on the total amount of the coating.

Another preferred composition of the coating on the flat carrier material comprises about 20% by weight to about 45% by weight of at least one binder, based on the total amount of the coating. The at least one binder is preferably formed from a polyester and a polyvinyl acetate. The polyester is advantageously in an amount in a range from about 10% by weight, preferably about 12% by weight, to about 35% by weight, based on the total amount of the coating, and the polyvinyl acetate is in an amount in a range from about 4% by weight, preferably from about 6% by weight, to about 20% by weight, based on the total amount of the coating. Such a composition of the coating further advantageously comprises at least one dye in an amount in a range from about 28% by weight, preferably from about 45% by weight, to about 80% by weight, more preferably in an amount in a range from about 50% by weight to about 70% by weight, based in each case on the total amount of the coating. Precisely one dye or precisely two dyes are particularly preferred by the coating. A thickening agent can also be present in the amount described above.

The aforementioned compositions can be applied, for example, with an air knife to the flat carrier material, preferably a viscose polyester fleece, as described above, by applying corresponding aqueous coating compositions to this and then drying at 100 ° C., for example.

The liquid coating composition, preferably an aqueous, for a flat, cloth-like carrier material for coloring or refreshing colorations in textile materials comprises at least one indigoid dye in oxidized form and at least one binder for the at least one indigoid dye, so that the at least one indigoid dye from a temperature of at least 20 ° C., preferably at a temperature in a range from about 25 ° C. to about 95 ° C., more preferably at a temperature in a range from about 30 ° C. to about 65 ° C., into an aqueous solution for dyeing or refreshing dyeings of textile materials can be delivered. In this regard, what has already been stated above in connection with the product according to the invention applies. The coating composition differs from the coating of the product according to the invention in that it additionally contains at least one solvent. The solvent is preferably water, but can also be, for example, ethanol, acetone or the like, or mixtures thereof. The coating itself on the cloth is dry, i.e. does not contain any solvents. The dry coating is obtained by a drying step in the production of the product according to the invention from the liquid coating composition, also according to the invention.

The coating composition particularly preferably comprises at least one indigoid dye in an amount in a range from about 4% by weight to about 50% by weight, preferably in an amount in a range from about 6% by weight to about 35% by weight. %, even more preferably in a range from about 8% by weight to about 20% by weight, based in each case on the total amount of the coating composition. The at least one binder is preferably in the coating composition in an amount in a range from about 0.2% by weight to about 28% by weight, more preferably up to about 20% by weight, and even more preferably in an amount in one Range from about 1% by weight to about 12% by weight, based in each case on the total amount of the coating composition. If gum arabic is used in the coating composition, this is advantageously included in an amount in a range from about 0.2% by weight to about 2% by weight, based on the total amount of the coating composition. If the at least one binder is selected from the group of natural and / or synthetic Resins, in particular from the preferred synthetic resins described above in connection with the product according to the invention, preferably a nonionic one, these are in an amount in a range of about 1.8% by weight, preferably about 2% by weight, up to about 15% by weight, preferably up to about 12% by weight, more preferably in an amount in a range from about 2% by weight, preferably from about 2.5% by weight, to about 10% by weight , in each case based on the total amount of the coating composition, comprised by this. If a polyester is provided as the synthetic resin, this is in an amount in a range from about 2.5% by weight to about 20% by weight, preferably up to about 10% by weight, based on the total amount of the coating composition includes. If the binder is a polyvinyl acetate, this is included in an amount in a range from about 1% by weight to about 6% by weight, based on the total amount of the coating composition.

More preferably, the coating composition can comprise at least one thickener. This is advantageously in an amount in a range from about 1.5% by weight, preferably from about 6% by weight, to about 30% by weight, preferably up to about 18% by weight, based on the total amount of Coating composition encompassed by this. The at least one thickener is particularly preferably an acrylic resin, preferably one in aqueous dispersion, more preferably one that is anionic.

More preferably, the coating composition advantageously comprises water in an amount in a range of about 35% by weight, preferably about 40% by weight, more preferably about 60% by weight, up to about 90% by weight, preferably up to about 85% % By weight, based on the total amount of the coating composition.

Furthermore, the coating composition can comprise urea in such proportions as mentioned above in connection with the coating. The urea remains completely in the coating after drying.

In addition, the coating composition can comprise other further auxiliaries familiar to the person skilled in the art. For example, it can be provided that the coating composition contains defoaming agent in an amount in a range preferably from about 0.1% by weight to about 1% by weight, more preferably from about 0.15% by weight to about 0.5 % By weight, based in each case on the total amount of the coating composition.

The coating composition is advantageously applied to the flat carrier material by means of air knives, but also any other suitable method, and then dried. The drying is preferably carried out at temperatures in a range from about 60 ° C to about 150 ° C. The viscosity of the coating composition before application to the at least one flat carrier material is preferably in a range from about 2,000 mPas to about 10,000 mPas, measured at 20 ° C. in accordance with DIN 53019-1: 2008.

The present invention further relates to a method for dyeing or refreshing dyeings in materials, preferably in a washing machine, wherein a product according to the invention, as described above, to textile materials in an aqueous solution at a temperature of at least 20 ° C, preferably at a Temperature in a range from about 25 ° C to about 95 ° C, even more preferably at a temperature in a range from about 30 ° C to about 65 ° C, over a period of at least 10 minutes, preferably over a period of about 15 Minutes to about 300 minutes, more preferably over a period of about 30 minutes to about 90 minutes.

The aqueous solution preferably also has a detergent, in particular a powder detergent. The pH of the aqueous solution is particularly preferably in a range from about 7, preferably about 9, to about 13. Even a single washing process with a color-releasing product according to the invention refreshes the color of the textiles.

The present invention also relates to a use of a dye-releasing product according to the invention for dyeing or refreshing dyeings in textile materials made of cotton, natural fibers and / or polyamide, preferably jeans or denim materials, this being the dye to be dyed or refreshed textile material is added, wherein the coating is at least partially detached from the flat carrier material in a washing process. The flat carrier material is preferably a fleece and preferably one which is not made from the aforementioned materials. It is preferably a fleece made from viscose and / or polyester fibers, in particular a white or light colored one. It is used in such a way that exactly one color-releasing product according to the invention is added to the mixture of textile materials to be colored or to be refreshed in the coloring, preferably in a commercially available washing machine.

The present invention further relates to the use of at least one indigoid dye in oxidized form in a coating of a flat, cloth-like carrier material, as described above, for dyeing or refreshing dyeings in the mixture of textile materials, in particular in jeans or denim materials, wherein the flat, cloth-like carrier material is added to the mixture of textile materials to be colored or to be refreshed in the dyeing, the coating being at least partially detached from the flat carrier material in a washing process. With regard to the indigoid dyes that can be used, the composition of the coating and the flat, cloth-like carrier material, reference is also made to the relevant designs and statements made in connection with the color-releasing product according to the invention.

These and other advantages of the present invention are explained in more detail with reference to the following exemplary embodiments.

A first coating composition was prepared from 83.5% by weight water, 16% by weight indigo (oxidized form), and 0.5% by weight gum arabic. The percentages by weight are based on the total amount of the coating composition. Gum arabic was first dissolved in a little water and then added to the mixture. 6 g of the aforementioned mixture were applied by means of air knives to a fleece as a flat carrier material measuring 13.5 cm × 19.5 cm with a weight per unit area of ^{50 g / m 2} , and the cloth was then dried at 50.degree. As a result, a coating formed on the flat material which had about 2.6% by weight of gum arabic and about 97.4% by weight of dye. A viscose-polyester fleece with a thickness of 0.5 mm was used as the fleece. It was white in color. When the similarly manufactured product was added to a wash of textile, blue jeans trousers in a commercially available washing machine with the addition of the usual amounts of a commercially available powder detergent, the washed jeans garments remained almost completely unchanged even after twenty washings .

A second coating composition was prepared which contained 80% by weight of water, 5.5% by weight of a nonionic binder based on polyester, 2.5% by weight of a further nonionic binder based on a vinyl acetate homopolymer, and 12% by weight. -% Indigo (oxidized form) comprised. The percentages by weight are based on the total amount of the coating composition. This second coating composition was applied by air knife to a flat, cloth-like carrier material in the form of a fleece identical to that used for the first coating composition, measuring 13.5 cm × 19.5 cm and then drying at 100.degree. The amount of dried coating on the nonwoven was about 24 g / m ² , corresponding to about 0.63 g of dried coating. About 40% by weight of the two binders and about 60% by weight of the indigo were present in the coating. 20 washes of blue jeans trousers were carried out each with one product, and the weight of the product was weighed before and after the wash. There was a difference of 0.5 g to 0.6 g, that is, the coating had almost completely detached from the sheet-like carrier material. The flat carrier material obtained in the form of the fleece was almost white. Even after 20 washes, the laundry washed with this product showed no signs of fading.

Corresponding to the second coating composition, a third coating composition was prepared with 74.3% by weight of water, 7.2% by weight of a first binder based on a polyester, 2.5% by weight of a second binder based on a vinyl acetate homopolymer and 16% by weight of the indigoid dye indigo carmine. The weight percentages relate to the total amount of the coating composition. This third aqueous coating composition was applied by means of an air knife to a flat material in the form of a fleece, as already described above in connection with the first coating composition, and then dried at 100.degree. The coating on the finished ink-releasing product consisted of about 38% by weight of the two binders and about 62% by weight of indigo carmine. The amount of coating on the substrate was about 1g. With the color-releasing product obtained by the third coating composition, a total of 20 washes with dark red laundry were carried out in a commercially available washing machine using a conventional powder detergent, in accordance with the above statements relating to the second coating composition. The washing took place, here as in the aforementioned cases, at 40 ° C with a colored laundry program. Dark red jeans trousers and a dark red T-shirt were used as laundry. The commercially available powder detergent was, for example, the Ariel® Color detergent from Procter & Gamble Service GmbH, Schwalbach am Taunus, Germany. Also in the case of the color-releasing products based on the third coating composition tested in the 20 washes, the weight of the fleece was tested before and after the wash and it was found that it was about 1g lighter on average after the wash, which means that as good as entire coating had detached itself from the flat carrier material in the form of a fleece. The fleece was almost white. The dark red wash showed no signs of fading.

With the color-releasing product according to the invention and the coating composition as well as the described method and the use of the product according to the invention, a product for dyeing or refreshing dyeing of laundry, in particular jeans or denim materials, is provided which is easy for the end user to handle. This advantageously provides the end user with an indication of the effect occurring immediately after washing has been carried out in the form of a product that is then undyed. In particular, according to the invention, dark-colored, preferably blue or red items of laundry are refreshed in their coloring or their coloring is retained, so that fading of the laundry cannot be detected even after a large number of washing processes.

Claims (17)

1. Coloring product for dyeing or refreshing dyes in textile materials, preferably in a washing machine, comprising a flat, clothlike carrier material, at least one coating applied to the carrier material and at least one indigoid dye in its oxidized form comprised by the coating, wherein the coating further comprises at least one binding agent for the at least one dye, so that the at least one dye can be dispensed into an aqueous solution from a temperature of about 20°C, the coating being at least partially dissolvable in a washing process from the flat carrier material which is added to the textile material to be dyed or to be refreshed in the dyeing.
2. Product according to claim 1, characterized in that the at least one binding agent is selected from a group comprising natural and/or synthetic resins, gum arabic, guar gum, gelatine, dextrins, agar agar, alginic acid, alginates, carrageenan, albumen, gel-Ian, locust bean gum, pectin, modified cellulose, starch, modified starch and/or xanthan.
3. Product according to claim 2, characterized in that the at least one binding agent is selected from the group of synthetic resins comprising polyesters, polyvinyl acetates, polyacrylates, polyglycols, polyvinyl alcohols and/or polyvinyl pyrrolidones and mixtures of said polymers, wherein the aforementioned polymers do not have any color scavenging effect or properties.
4. Product according to one or more of the preceding claims, characterized in that the at least one binding agent is present in an amount ranging from about 1% by weight to 50% by weight, based on the total amount of the coating.
5. Product according to one or more of the preceding claims, characterized in that the coating comprises at least two binding agents, wherein a first binding agent has a pH in a range from about 3.5 to about 5.5 and a second binding agent has a pH in a range from about 5.6 to about 9.
6. Product according to one or more of the preceding claims, characterized in that the at least one binding agent is non-ionic.
7. Product according to one or more of the preceding claims, characterized in that the at least one indigoid dye in oxidized form is selected from a group comprising indigo, indigorubin, indigocarmine, purple and derivatives thereof.
8. Product according to one or more of the preceding claims, characterized in that the at least one indigoid dye is present in oxidized form in an amount ranging from about 30% by weight to about 98% by weight, based on the total amount of the coating.
9. Product according to one or more of the preceding claims, characterized in that the at least one indigoid dye in oxidized form has a particle size in a range ≤ 1.5 µm.
10. Product according to one or more of the preceding claims, characterized in that the coating further comprises at least one thickening agent.
11. Product according to one or more of the preceding claims, characterized in that the flat, clothlike carrier material is a non-woven fabric.
12. Product according to one or more of the preceding claims, characterized in that the flat, clothlike carrier material is a viscose-polyester nonwoven.
13. Product according to one or more of the preceding claims, characterized in that the flat, clothlike carrier material cannot be dyed by the at least one indigoid dye in oxidized form.
14. Method for dyeing or refreshing dyes in textile materials, preferably in a washing machine, wherein a product according to one or more of claims 1 to 13 is added to textile materials in an aqueous solution at a temperature of at least 20°C over a period of at least 10 minutes.
15. Method according to claim 14, characterized in that the pH value of the aqueous solution is in a range of about 7 to about 13.
16. Use of a product according to one or more of claims 1 to 13 for dyeing or refreshing dyeings in textile materials of cotton, natural fibres and/or polyamide, wherein said product is added to the textile material to be dyed or refreshed in the dyeing, wherein the coating is at least partially dissolved from the flat carrier material in a washing process.
17. Use of at least one indigoid dye in oxidized form in a coating of a flat, clothlike carrier material for dyeing or refreshing dyes in textile materials, the flat, clothlike carrier material being added to the textile material to be dyed or refreshed in the dyeing, the coating being at least partially dissolved from the flat carrier material in a washing process.