EP3795666A1 - Flat structure and use thereof when washing a textile material - Google Patents

Abstract

The present invention relates to a flat structure comprising: a flat carrier material; and at least one coating on at least one side of the flat carrier material; wherein the coating comprises at least one cellulase and at least one dye; as well as the use of the same when washing a textile material.

Description

The present invention relates to a sheet-like structure, a coating composition for producing the sheet-like structure, a method for washing a textile material and the use of the sheet-like structure when washing a textile material.

BACKGROUND OF THE INVENTION

The use of towels (or similar sheet-like products) in the washing of textile materials such as clothing is well known in the art. Such wipes are used to achieve various positive effects during the washing process.

For example, wipes are known from the prior art, on the surface of which washing-active substances are applied. Such wipes can be used as a substitute for powder or liquid detergent or to support the same.

In addition, washcloths are known to which optical brighteners are applied. These optical brighteners are suitable to be adsorbed on textiles and thus to lead to a brilliant white or a bright color of the textiles.

Cloths are also known from the prior art which are intended to counteract graying of white laundry. For this purpose, cloths are used, for example, the surface of which is cationized, for example provided with a cationic compound. Due to the surface modification mentioned, such cloths are able to intercept dyes and contaminants released during the washing process so that they cannot redeposit on the laundry.

Conversely, there is also the problem that black or dark items of laundry slowly become lighter after being washed several times. Detergents are known from the prior art which are intended to counteract a corresponding lightening, for example by refreshing the dark color. However, the effect achieved according to the prior art is often inadequate and the lightening of the item of laundry cannot be stopped permanently and to a sufficient extent.

Further problems of known methods for washing items of laundry arise from the mechanical stress during the washing process. In particular, if the item of laundry to be washed comprises cotton fibers, the mechanical stress during the washing process leads to fiber fibrils (the finest fibrils), which can then agglomerate, which leads to so-called "pilling" (ie the formation of knots or fluff in fabrics). These protruding fibers and pills affect the external appearance of the item of laundry. Furthermore these lead Nodules and protruding fibers cause the color of the textile to lose its luminosity due to the refraction of light and the textiles appear washed out.

It is therefore, proceeding from the prior art, the object on which the present invention is based to provide a cloth for a washing process that overcomes the disadvantages of the prior art, in particular is suitable for lightening a (preferably dark) item of laundry even after a large number of washing processes to efficiently prevent and at the same time prevent the occurrence of pilling during the individual washing processes.

DESCRIPTION OF THE INVENTION

This object is achieved by a flat structure comprising: a flat carrier material; and at least one coating on at least one side of the flat carrier material; wherein the coating comprises at least one cellulase and at least one dye.

Surprisingly, if the fabric according to the invention is added to the washing solution / clothes during the washing of a dark item of clothing in a washing machine, the dark color of an item of laundry washed in this way can be approximately maintained even after a large number of washing processes and pilling is prevented at the same time.

It can be provided that the flat carrier material is a nonwoven fabric, a woven fabric, a scrim, a braid, a knitted fabric, a knitted fabric or a mixture thereof, preferably a nonwoven fabric or a woven fabric. Most preferably the carrier material is a nonwoven fabric. It can preferably be provided that the flat carrier material is white or has a light color. In this context, it can preferably be provided that the flat carrier material is made from fibers that are not colored directly by the one or more dye (s) contained in the coating.

It can be provided that the flat carrier material comprises predominantly synthetic fibers. In this context, “predominantly” means that the flat carrier material contains the synthetic fibers in an amount of at least 50% by weight, preferably at least 60% by weight, furthermore preferably at least 70% by weight, more preferably at least 80% by weight. -%, furthermore preferably at least 90% by weight, particularly preferably at least 95% by weight, most preferably consists of the synthetic fibers.

It can preferably be provided that the synthetic fibers comprise or consist of polyethersulfone fibers, polyolefin fibers, polyamide fibers, polyester fibers, fibers of degradable polymers, viscose fibers, polylactic acid fibers or mixtures thereof, preferably consist of polyethersulfone fibers.

The fiber diameter can in principle be in a range from approximately 1 μm to approximately 0.5 mm. The fibers can be produced by any known method, for example a wet spinning process.

In one embodiment it can be provided that the flat carrier material has a weight per unit area of 10 to 500 g / m ² , preferably 30 to 100 g / m ² , preferably 40 to 80 g / m ² , preferably 50 to 70 g / m ² , particularly preferably 55 to 65 g / m ² .

It can be provided that the coating is applied to both sides of the flat carrier material or only to one side of the carrier material (in each case completely or partially). It can be provided that the coating is applied in an amount of 10 g / m ² to 200 g / m ² , preferably 20 g / m ² to 100 g / m ² , particularly preferably 30 g / m ² to 50 g / m ² , based on the area of the carrier material in which the planar structure is present.

In one embodiment it can be provided that the coating further comprises at least one binder. It can be provided here that the binder is selected from the group consisting of natural resins, synthetic resins and mixtures thereof.

Suitable natural resins in this context are for example gum arabic, guar gum, gelatin, dextrins, agar agar, alginic acid, alginates, carrageenan, egg white, gellan, locust bean gum, pectin, modified cellulose, starch, modified starch, xanthan or mixtures of two or more thereof .

Suitable synthetic resins in this context are, for example, polyesters, polyvinyl acetates, polyacrylates, polyglycols, polyvinyl alcohols, polyvinyl pyrrolidones or mixtures of two or more thereof.

It can be provided that the binder is present in an amount of 1% by weight to 50% by weight, preferably 2% by weight to 10% by weight, based on the total weight of the coating.

It can be provided that the binder is suitable for releasing the dye and the enzyme into an aqueous solution from a temperature of 20 ° C., preferably higher. It can also be provided that the binder is suitable for releasing the dye and the enzyme into an aqueous solution in a pH range of 3.5 to 10, preferably 6 to 10, particularly preferably 6 to 8.

In a preferred form of expression it is provided that the binder is starch and / or modified starch.

In one embodiment it can be provided that the cellulase has a pH optimum in a range from 6 to 10, preferably 6 to 8. The cellulase to be used in the agents according to the invention can be obtained from bacteria or fungi Be an enzyme which has a pH optimum preferably in the almost neutral to alkaline range from 6 to 10, in particular from 6 to 8 (1 percent by weight solution in distilled water). Mixtures of two or more cellulases and then in particular cellulases from different organisms can also be used in the agents according to the invention. For example, a cellulase can be provided which has a molecular weight of about 20 kDa and has at least 80% of its maximum activity at 50 ° C. in the pH range from 4 to 9, with almost 50% of its maximum activity still being retained at pH 10 .

Cellulase is preferably contained in the coating in such amounts that it has a cellulolytic activity of 3 CMC-U to 40 CMC-U, in particular from 5 CMC-U to 25 CMC-U and particularly preferably from 6 CMC-U to 20 CMC- U, based in each case on 100 g of the coating. The determination of the cellulolytic activity (CMCase activity) is based on that of M. Lever in Anal. Biochem. 47: 273-279 (1972) and Anal. Biochem. 1977, 81: 21-27 described procedure. 1 CMC-U corresponds to the amount of enzyme that produces 1 µmol glucose per minute under these conditions.

A suitable cellulase according to the invention is, for example, the commercially available rucolase EPE 3120.

The cellulase is preferably present in the coating in an amount of from 0.1% by weight to 1% by weight, based on the total weight of the coating.

In principle, a large number of dyes can be used in the coating according to the invention. Azo dyes are particularly preferably used. Azo dyes have one or more azo bridges as chromophores. The at least one dye is particularly preferably black. Examples of black dyes which can be used with particular preference are the dyes Celasol Direkt Black OB 150% and Celasol Direkt Black VSF 600%. The two aforementioned black dyes are azo direct dyes. However, other azo dyes, in particular dark blue, dark gray or black azo dyes, can preferably be used in the coloring product according to the invention. In order to prevent graying of dark-colored textiles, in particular dark blue, dark gray and / or black textiles, or to refresh their colors, in particular dark blue, dark gray and / or black azo dyes are used.

The at least one dye is preferably in an amount in a range from about 5% by weight to about 30% by weight, preferably 5% by weight to about 20% by weight, particularly preferably 5% by weight to about 15% by weight, based on the total weight of the coating, in the coating.

It can be provided that the coating comprises at least one further additive selected from the group consisting of an odor absorber; preferably activated carbon or zinc ricinoleate; a fragrance; a dye fixing agent; an optical brightener, preferably a cationic resin; a further enzyme, preferably an amylase, a protease, a lipase, a laccase, a pectinase or a mixture of two or more thereof; a complexing agent; a biocidal agent; an extract of natural substances; a detergent substance, preferably a surfactant; a substance that supports a washing process, preferably carboxymethyl cellulose; a substance that prevents re-soiling of textiles, a base, preferably Na ₂ CO ₃ ; a leveling agent such as the commercially available Sarabid DLC; and mixtures of two or more thereof.

The object is also achieved by a coating composition for a flat carrier material, comprising at least one cellulase, at least one dye and preferably at least one binder.

Preferred embodiments which are described in connection with the planar structure according to the invention are also preferred embodiments with regard to the coating composition.

In addition, the object on which the invention is based is achieved by a method for washing a textile material, comprising: providing the textile material together with a planar structure according to the invention in water or (preferably) an aqueous solution; Washing of the textile material together with the fabric in the water or the aqueous solution at a temperature of at least 20 ° C. for at least 10 minutes.

The method according to the invention is preferably carried out in a washing machine, preferably at a temperature in a range from about 20 ° 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, even more preferably over a period of about 30 minutes to about 90 minutes. The aqueous solution preferably also has a detergent, in particular a color detergent. The pH of the aqueous solution is particularly preferably in a range from about 9 to about 13.

The textile material is preferably an item of clothing, such as a shirt, T-shirt, trousers, jacket, sweater, stocking, sock, etc. It is also preferably provided that the textile material is made of cotton, natural fibers, Polyester, polyamide or mixtures thereof is made.

Preferred embodiments that are described in connection with the planar structure according to the invention are also preferred embodiments with regard to the method according to the invention.

Finally, the object is achieved through the use of the planar structure according to the invention when washing a textile material, in particular for dyeing the textile material, to refresh the color of the textile material or to preserve the color of the textile material as much as possible.

Preferred embodiments which are described in connection with the planar structure according to the invention are also preferred embodiments with regard to the use according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

The invention is to be described in detail below with reference to specific exemplary embodiments. The main purpose of this description is to illustrate the invention. The person skilled in the art is aware that not necessarily all of the features mentioned in the expression examples are necessary for realizing the invention. Rather, the person skilled in the art is aware that individual features mentioned in the exemplary embodiments together with features listed in the general description of the invention can also contribute to realizing the invention.

1. Production of a sheet-like structure according to the invention

On a needle fleece (60 g / m ² ) made of polyethersulfone (flat carrier material), 1-100% of the surface of the fleece was first printed by flat printing with a pigment paste of the composition mentioned below using a rotary printing process (consumption at 1% of the surface 0.6 g / m ² ), followed by drying and fixing.

Pigment paste composition (based on 1 kg paste): Bezaprint black DW 27 g / kg Olimprint Navy RSV 13 g / kg Print thickening for pigment 0.960 kg

Subsequently, a coating according to the invention was applied to the previously printed two-dimensional carrier material by means of a two-dimensional application of an ink-released coating composition of the following composition by means of a roller doctor blade system.

Composition per 1 kg coating composition: Lameprint CE 0.05 kg Na ₂ CO ₃ 0.02 kg Celasol Direkt Black OB 150% (= dye) 0.035 kg Celasol Direkt Black VSF 600% (= dye) 0.035 kg Sarabid DLC 0.01 kg Rucolase EPE 3120 (= cellulase) 0.0032 kg demineralized water 0.8468 kg

A coating paste amount of 300 g / m ² (+/- 10% by weight), based on the area of the sheet-like carrier material to be coated, was used. After the coating composition had been knife-coated onto the sheet-like carrier material, the coating was dried until a solids content of the coating on the sheet-like carrier material of 40 g / m ² (+/- 10% by weight) was obtained.

2. Comparative examples

As comparative examples, two further sheet-like structures were produced in accordance with the instructions for the production of the sheet-like structure according to the invention, whereby, unlike the exemplary embodiment according to the invention, in the first case only the dye, but not the cellulase, was contained in the coating, and in the second case only the cellulase, but not the dye was contained in the coating.

3. Experimental results

• lediglich unter Verwendung des Colorwaschmittels (Probe 1),
• unter Verwendung des Colorwaschmittels und gleichzeitiger Verwendung der Flächengebilde gemäß den Vergleichsbeispielen (Probe 2, nur Farbstoff) und (Probe 3, nur Enzym) und
• unter Verwendung des Colorwaschmittels und gleichzeitiger Verwendung des erfindungsgemäßen Flächengebilde (Probe 4, Farbstoff + Enzym) durchgeführt.

Black items of laundry (new starting textile) were washed in a washing machine twenty times at 40 ° C together with a color detergent. The washing was

• only using the color detergent (sample 1),
• using the color detergent and simultaneous use of the fabrics according to the comparative examples (sample 2, only dye) and (sample 3, only enzyme) and
• carried out using the color detergent and simultaneous use of the fabric according to the invention (sample 4, dye + enzyme).

The brightness values of the washed items of laundry and the pilling properties (product image) were determined and compared with the values obtained for the starting material (sample 5).

3.1 Brightness values

The brightness values L * (D65) were measured. The lower the L * (D65) the sample 1* 2 * 3 * 4 ** 5 *** L * (D65) 32.8 28.0 32.2 25.8 25.6 The textile appears more intense in color (black). The following values were determined.
* Comparative examples
** Embodiment according to the invention
*** Original textile material

3.2 Pilling properties Evaluation of the appearance of the goods (smoothness of the textile surface):

sample 1* 2 * 3 * 4 ** 5 *** Assessment of the product image 2 2-3 5 5 5

Grading scale for evaluating the product image

5 smooth textile surface, no pilling 4th light pilling 3 moderate pilling 2 significant pilling 1 dense, strong pilling

Surprisingly, for the laundry with the combination of black color and enzyme (sample 4), a significant deepening of the color of the black laundry, which corresponds to the depth of color of the original fabric (sample 5) - with a smooth appearance of the goods without pilling - was observed. which would have been expected for the individual coating components.

The features disclosed in the foregoing description and the appended claims can, separately or in combination, be the object for realizing the aspects of the disclosure made in the independent claims in different forms thereof.

Claims (15)

Flat structures, comprising: - a flat carrier material; and - At least one coating on at least one side of the flat carrier material; wherein the coating comprises at least one cellulase and at least one dye. Flat structure according to claim 1, wherein the flat carrier material is a nonwoven fabric, a woven fabric, a scrim, a braid, a knitted fabric, a knitted fabric or a mixture thereof. Flat structure according to claim 1 or 2, wherein the flat carrier material comprises predominantly synthetic fibers. Flat structure according to one of the preceding claims, wherein the flat carrier material has a weight per unit area of 10 to 500 g / m ² . Flat structure according to one of the preceding claims, wherein the coating further comprises at least one binder. The sheet of claim 5, wherein the binder is selected from the group consisting of natural resins, synthetic resins, and mixtures thereof. Flat structure according to one of claims 5 or 6, wherein the binding agent is starch and / or modified starch. Flat structure according to one of the preceding claims, wherein the cellulase has a pH optimum in a range from 6 to 10. Sheet-like structure according to one of the preceding claims, wherein the dye is an azo dye. Sheet-like structure according to one of the preceding claims, wherein the dye is black. Flat structure according to one of the preceding claims, wherein the coating comprises at least one further additive selected from the group consisting of an odor absorber, a fragrance, a color fixing agent, an optical brightener, a further enzyme, a complexing agent, a biocidal active ingredient, a natural substance extract, a detergent substance, a substance that supports a washing process, a substance that prevents re-soiling of textiles, a base, a leveling agent and mixtures of two or more of them. Coating composition for a sheet-like carrier material, comprising at least one cellulase, at least one dye and preferably at least one binder. A method for washing a textile material, comprising - Provision of the textile material together with a flat structure according to one of claims 1 to 11 in water or an aqueous solution; - Washing the textile material together with the fabric in the water or the aqueous solution at a temperature of at least 20 ° C for at least 10 minutes. The method of claim 13, wherein the aqueous solution further comprises at least one detergent. Use of the sheet-like structure according to one of Claims 1 to 11 in washing a textile material.