EP4282943A1

EP4282943A1 - Tablet, powder or granulate for preparing a liquid soap

Info

Publication number: EP4282943A1
Application number: EP22175258.7A
Authority: EP
Inventors: Marta HELMIN; Norbert Kuhl; Thomas RÜBENER
Original assignee: Everdrop GmbH
Current assignee: Everdrop GmbH
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2023-11-29

Abstract

The present invention concerns a tablet, powder or granulate comprising:- 15 to 40 wt.% of an anionic surfactant,- 10 to 35 wt.% of an amphoteric surfactant and- 5 to 20 wt.% of an organic acid,wherein the tablet, powder or granulate is free from any thickeners, preferably for preparing a liquid soap, a method for preparing a liquid soap and the use of the table, powder or granulate for preparing a liquid soap.

Description

The present invention relates to a tablet, powder or granulate, to a method for preparing a liquid soap and to the use of the tablet, powder or granulate for preparing a liquid soap.
Liquid soap products such as dishwashing soaps are known as an alternative to soap bars. Such liquid soap products are usually offered in bottles or similar containers, which may be equipped with a pump dispenser and are thus easy to portion for use. The manufacturers of such liquid soap products also often offer refill packs from which the pump dispensers can be refilled.
With the growing environmental awareness of the customers, such conventional liquid soap products are more and more in the criticism.
On the one hand, the packaging of liquid soap products in pump dispensers or refill packs produces a large amount of waste, especially plastic waste. Even if nowadays a large part of the waste can be recycled, this still requires a significant energy input.
On the other hand, these liquid soap products usually consist, in addition to washing-active substances and other ingredients such as perfumes or care products, mainly of water. This means that a considerable amount of energy is required to transport a product that consists mainly of water, although water is available in every household, from the manufacturer to the point of sale and further to the end user and that it is a very expensive and energy consuming process.
In order to overcome these disadvantages and to provide a sustainable liquid soap product, tablets, powder or granulates, comprising the washing-active substances were presented. These comprise the washing-active substances and other ingredients in an essentially dry state and are dissolved in water by the end user to obtain a liquid soap product. This technology has the advantage that only the dry substances of the liquid soap product have to be transported, which requires only a minor fraction of the energy. Furthermore, these products make it possible to use the same container, such as a pump dispenser, as often as desired. After consuming a batch of liquid soap product, a new liquid soap product can be easily produced by dissolving a detergent tablet, detergent powder or detergent granulate in the same container.
The mere dissolution of washing-active substances in water produces a liquid soap product that can certainly be used for washing in principle, but such a liquid soap product has a relatively low viscosity, which makes portioning and practical application somewhat difficult.
The liquid soap product should therefore have a higher viscosity than water, as is the case with conventional liquid soap products.
Attempts are made to improve the handling by using special pump dispensers, which generate a foam from the liquid. However, such pump dispensers are more complex in construction and are usually conceptualized for single use. Moreover, foamed soaps are less popular than soap products in the form of a viscous liquid, because the cleaning performance and thus the correct dosage of such foams is difficult to estimate by the consumer.
Other attempts to increase the viscosity of a liquid soap product is the addition of thickeners. However, the thickeners do usually not have any washing activity and thus mainly add weight to the composition, without improving the washing performance, which is again negative for the transportation of the product.
Therefore, it was the objective of the present invention to provide a means by which an end user can easily produce a liquid soap product, preferably in the home environment, in order to overcome the above-mentioned disadvantages of conventional liquid soap products, such as the production of waste, especially plastic waste, and the high energy consumption during transport. In particular, the objective is to provide a tablet, powder or granulate that can be dissolved in water by the end user, preferably in the home environment, to obtain a liquid soap product. This liquid soap product should be as environmentally and skin friendly as possible, have the best possible cleaning performance and, in particular, have a pleasant viscosity that allows easy portioning and handling, without the addition of any thickeners
This objective has been solved by a tablet, powder or granulate according to claim 1, in particular by a tablet, powder or granulate comprising:

15 to 40 wt.% of an anionic surfactant,
10 to 35 wt.% of an amphoteric surfactant and
5 to 20 wt.% of an organic acid,

Without being bound to that theory the inventors have found that a composition that comprises an anionic surfactant and an amphoteric surfactant in the defined ranges leads to a viscous liquid soap product after being dissolved in water. This may be caused by the formation of a three dimensional network formed by the anionic surfactant and the amphoteric surfactant that interact via the charged head groups and which eventually leads to the formation of a gel like liquid.
Preferred embodiments of the tablet, powder or granulate are defined in the dependent claims.
Preferred embodiments are given in the dependent claims.
The ensuing description provides some embodiment(s) of the invention, and is not intended to limit the scope, applicability or configuration of the invention or inventions. Various changes may be made in the function and arrangement of elements without departing from the scope of the invention as set forth herein. Some embodiments maybe practiced without all the specific details.
It should be understood that features of one embodiment may be used in combination with features from another embodiment where the features of the different embodiment are not incompatible.
It will also be understood that, although the terms first, second, etc. may be used herein to describe various compositions, these compositions should not be limited by these terms. These terms are only used to distinguish one compositions from another. For example, a first compositions or element could be termed a second compositions or element, and, similarly, a second compositions or step element be termed a first compositions or element. The first compositions or element, and the second compositions or element, are both compositions or element, respectively, but they are not to be considered the same composition or element.
The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the subject matter. As used in this description and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms "includes," "including," "comprises," and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In particular, the term "comprise" does also mean "consisting of" throughout this specification.
Unless otherwise stated, the unit "wt.-%" refers to wt.% with respect to the total weight of the tablet, powder or granulate, respectively.
Any values given for a viscosity refer to the viscosity as determined using a Brookfield Viscometer LV spindle LV-2 (62), 3-12 U/min at 20°C.
The tablet, powder or granulate according to the invention has the advantage that it can be easily dissolved in water by the end customer in order to produce a liquid soap product in the home environment. This brings the advantage that no water needs to be transported to the end customer, which safes energy required during transport as outlined above. Further, the end customer can easily reuse the container or dispensers, which are used for storing and/or dispensing the liquid soap product. Further, the tablet, powder or granulate provides the possibility to produce a liquid soap product with a viscosity that is comfortable for usage and portioning, without the addition of thickeners. Moreover, a viscous soap is more likely to remain on a cleaning sponge or a dish to be washed and contributes to longer foam stability. Finally, the tablet, powder or granulate provides the possibility to produce a liquid soap product with a sufficiently high cleaning performance, which is environmentally and skin friendly.
A "tablet" (commonly abbreviated with "tab") as described herein shall be preferably understood as a portioned and compressed, preferably under pressure, powders, granulates or other substrates.
In embodiments, the tablet has an essential cuboid form with an essential rectangular or square base.
Preferably, the tablet has a length from 10 mm to 25 mm, preferably from 15mm to 20 mm, a width from 10 mm to 25 mm, preferably from 15 mm to 20 mm, and a height from 5 mm to 20 mm, preferably from 10mm to 17 mm.
In embodiments, the tablet has an essential cylindrical shape with an essentially round base. In these embodiments, the table has a base diameter of preferably from 10 mm to 25mm, preferably 18 mm to 22 mm and a height from 5 mm to 20 mm, preferably from 8 mm to 15 mm
In other embodiments, the tablet has a three dimensional shape with a base that is any other polygon apart from a rectangle or a square.
In embodiments, the tablet, irrespective of the shape, has a volume 350 to 10000 mm³ preferably from 1200 to 2600 mm³ or from 1600 to 3200 mm³.
In embodiments, the total weight of the tablet is from 2 to 9 g, in particular from 4 to 6 g.
A "powder" as described herein is preferably understood as general term for a form of disintegration of dry solid materials obtained by crushing, grinding in mills or as a result of atomization drying or freeze-drying.
A rough classification of powders into coarse powder, fine powder and ultra-fine powder is common according to particle size; a more precise classification of powdery bulk materials is done by their bulk density (DIN ISO 697: 1984-01) and/or by sieve analysis.
Powders are one of the common states of matter in chemical technology, e.g. in the production of detergents.
As used herein a powder refers to particles with a (mean or D50) particle size of less than 1 mm or less than 0.5 mm, e.g. determined by sieve analysis.
A "granulate" as described herein refers preferably to a term for accumulations of granules. A granule is an asymmetrical aggregate of powder particles. It has usually no harmonious geometric shape. The surface is usually uneven and jagged and the mass in many cases more or less porous. As a criterion for the utility value of granulates, the determination of the bulk density according to DIN-ISO 697: 1984-0 can be used.
As used herein a granulate refers to particles with a (mean or D50) particle size of 1 mm to 5 mm, e.g. determined by sieve analysis.
Preferably, the composition according to the invention is in the form of a powder or a granulate, most preferably in the form of a powder.
Surfactant are usually understood as molecules that spontaneously bond with each other to form sealed bubbles. Surfactants are preferably compounds that lower the surface tension (or interfacial tension) between two liquids, between a gas and a liquid, or between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsifiers, foaming agents, or dispersants.
Surfactants are usually organic compounds that are amphiphilic, meaning they contain both hydrophobic groups (their tails) and hydrophilic groups (their heads). Therefore, a surfactant contains both a water-insoluble (or oil-soluble) component and a water-soluble component. Surfactants will diffuse in water and adsorb at interfaces between air and water or at the interface between oil and water, in the case where water is mixed with oil. The water-insoluble hydrophobic group may extend out of the bulk water phase, into the air or into the oil phase, while the water-soluble head group remains in the water phase.
Therefore, the surfactant is able to dissolve water insoluble compounds, such as water insoluble contaminations on the skin, on a cloth or on a dish in the water, therewith exhibiting cleaning performance.
Accordingly, an anionic surfactant comprises a negatively charged head group and an amphoteric surfactant comprises a head group with a positive and a negative charge, resulting in a neutral net charge.
In embodiments, the powder or granulate according to the invention comprises 15 to 40 wt.% of an anionic surfactant, preferably 20 to 37.5 wt% of an anionic surfactant.
In embodiments, the powder or granulate according to the invention comprises 10 to 35 wt.% of an amphoteric surfactant, preferably 10 to 25 wt.% of an amphoteric surfactant.
In embodiments, the powder or granulate according to the invention comprises 5 to 20 wt.% of an organic acid, preferably 10 to 15 wt.% of an organic acid.
In embodiments, the powder or granulate according to the invention comprises 5 to 20 wt.% of an organic acid and from 10 to 30 wt.% of a salt of that organic acid, preferably 10 to 15 wt.% of an organic acid and 20 to 25 wt.% of a salt of that organic acid.
The powder or granulate according to the invention is free from any thickeners.
Preferably, the powder or granulate according to the invention does not comprise more than 1 wt.% of a thickener, preferably not more than 0.5 wt.% of a thickener and most preferably not more than 0.1 wt.-% of a thickener.
In embodiments, the powder or granulate according to the invention is free from any thickeners, which means that not more than inevitable traces of any thickener are present, preferably, the powder or granulate according to the invention is completely free of any thickeners.
In embodiments, the anionic surfactant is selected from the group comprising alkyl benzenesulfonates, alkanesulfonates, olefin sulfonates, alkylether sulfonates, glycerol ether sulfonates, methyl ester sulfonates, sulfofatty acids, alkyl sulfates, fatty alcohol ether sulfates, glycerol ether sulfates, fatty acid ether sulfates, hydroxy mixed ether sulfates, monoglyceride (ether) sulfates, fatty acid amide (ether) sulfates, mono- and dialkyl sulfosuccinates, mono- and dialkyl sulfosuccinamates, sulfotriglycerides, amide soaps, ether carboxylic acids and salts thereof, fatty acid isethionates, fatty acid sarcosinates, fatty acid taurides, N-acylamino acids, preferably acyl lactylates, acyl tartrates, acyl glutamates and acyl aspartates, alkyl oligoglucoside sulfates, protein fatty acid condensates, alkyl (ether) phosphates and mixtures of two or more thereof,
In embodiments, the anionic surfactant is selected from the group comprising fatty acid sulfate, fatty acid glutamate, fatty acid sulfonate, fatty acid sulfosuccinate and/or fatty acid sarcosinate.
In embodiments, the anionic surfactant is or comprises fatty acid sulfate.
In embodiments, the anionic surfactant is or comprises a fatty acid sulfate with 12 to 18 carbon atoms, such as sodium laureth sulfate.
In embodiments, the amphoteric surfactant is selected from the group comprising betaines, alkylbetaines, alkylamidobetaines, aminopropionates, aminoglycinates, imidazolinium betaines, sulfobetaines and/or sultaines or a mixture of two or more thereof.
Preferred is a betaine, such as cocoamidopropyl betaine.
In embodiments, the organic acid is selected from the group comprising citric acid, lactic acid, malic acid, tartaric acid, oxalic acid, oxalic acid, glucaric acid, gluconic acid, phenylsuccinic acid, succinic acid, and a mixture of two or more thereof, preferably is citric acid, malic acid, tartaric acid and oxalic acid, and a mixture of two or more thereof, preferably citric acid.
In embodiments, the organic acid is selected from a mixture comprising citric acid, lactic acid, malic acid, tartaric acid, oxalic acid, oxalic acid, glucaric acid, gluconic acid, phenylsuccinic acid, succinic acid, and a mixture of two or more thereof, preferably is citric acid, malic acid, tartaric acid and oxalic acid, and a salt of the respective organic acid. Preferred are alkali salts, such as sodium salts.
In embodiments, the organic acid is or comprises citric acid and a salt of citric acid, such as an alkali salt, such as sodium citrate.
The organic acid, especially citric acid, especially in the mixture with a respective salt, can enhance the dissolution of the tablet, powder or granulate and may also help to provide a constant distinct pH in the final product.
In embodiments, the tablet, powder or granulate is free from any thickeners, selected from the group comprising polymeric thickeners or a mixture of two or more thereof, wherein the thickener is preferably selected from the group comprising polysaccharides, starches, high molecular weight polyethylene glycol, polyacrylates, polyacrylamides, polyvinyl alcohol, polyvinyl pyrrolidone.
In embodiments, the the tablet, powder or granulate is free from xanthan gum, inulin, guar-guar, agar-agar, alginates and tyloses, carboxymethyl cellulose and hydroxyethyl cellulose, and mixtures of two or more thereof.
In embodiments, the tablet, powder or granulate is free from xanthan gum, inulin, or a mixture thereof.
Preferably, the powder or granulate according to the invention does not comprise more than 1 wt.% of the before mentioned thickeners, preferably not more than 0.5 wt.% of the before mentioned thickeners and most preferably not more than 0.1 wt.-% of the before mentioned thickeners.
In embodiments, the powder or granulate according to the invention is free from any of the before mentioned thickeners, which means that not more than inevitable traces of any of the before mentioned thickeners are present, preferably, the powder or granulate according to the invention is completely free of any of the before mentioned thickeners.
In embodiments, the tablet, powder or granulate further comprises a preservative, preferably selected from the group consisting of benzoic acid, sorbic acid, phenoxyethanol, parabens, amino acids such as lysine, pentanediol, sodium anisate, dehydroacetic acid, potassium sorbate or a mixture of two or more thereof, preferably benzoic acid or a salt thereof, such as sodium benzoate.
If present, the preservative is preferably contained in an amount of 1 to 10 wt.%, preferably 3 to 7 wt.%.
In embodiments, the tablet, powder or granulate further comprising an additive, preferably selected from the group consisting of a stabilizer, a chelator, such as EDTA or GLDA, an antioxidant, a mineral salt, such as NaCl, a dye, an olfactory compound, and a mixture of two or more thereof.
If present, each of these additives may be present in an amount of 0.1 to 5 wt.-%, preferably 0.1 to 1 wt.%.
In embodiments, the tablet, powder or granulate further comprises a further surfactant selected from sophoro lipids, amino acid based surfactants, sugar based surfactants and/or fatty alcohol ethoxylates.
In embodiments, the tablet, powder or granulate further comprising a further surfactant selected alcohol ethoxylates, alcohol propoxylates, propoxylated fatty alcohols, alkoxylated fatty acid alkyl esters, ethoxylated fatty acid alkyl esters, propoxylated fatty acid alkyl esters, alkylphenol ethoxylates, nonylphenol ethoxylates, alkylpolyglycosides, alkoxylated amines, fatty acid monoethanolamides, fatty acid diethanolamides, ethoxylated fatty acid monoethanolamides, propoxylated fatty acid monoethanolamides, polyhydroxyalkyl fatty acid amides, N-acyl N-alkyl derivatives of glucosamine (glucamides, GA, or fatty acid glucamides, FAGA), polysorbates and mixtures of two or more thereof.
If present, each of these additional surfactants may be present in an amount of 0.1 to 10 wt.-%, preferably 0.1 to 1 wt.% or 3 to 8 wt.-%.
In embodiments, the tablet, powder or granulate further comprises a base, preferably sodium bicarbonate or sodium carbonate.
The base may be provided that the tablet, powder or granulate can easily dissolve in water. The dissolving of the tablet, powder or granulate may be enhanced under slightly acidic conditions.
If present, the base may be present in an amount of 0.1 to 10 wt.-%, preferably 0.1 to 1 wt.%.
In embodiments, the weight ratio of the anionic surfactant to the amphoteric surfactant in the tablet, powder or granulate is from 3:1 to 1:1.
In embodiments, the tablet, powder or granulate further comprises probiotica, such as spores of microorganisms, enzymes, such as amylases or proteases.
In embodiments, the tablet, powder or granulate comprises less than 1.5 wt.% water.
In a preferred embodiment, the tablet, powder or granulate comprises:

10 to 20 wt.%, preferably 12 to 16 wt.%, citric acid,
20 to 30 wt.%, preferably 22 to 25 wt.%, sodium citrate,
30 to 40 wt.%, preferably 35 to 38 wt.%, fatty acid sulfate,
8 to 15 wt.%, preferably 10 to 14 wt.%, betaine surfactant, in particular cocoamidopropyl betaine,
3 to 8 wt.-% tetra sodium-N,N-bis(carboxylatomethyl)-L-glutamate (GLDA), and
3 to 8 wt.-% sodium benzoate.

In a preferred embodiment, the tablet, powder or granulate comprises:

10 to 20 wt.%, preferably 12 to 16 wt.%, citric acid,
20 to 30 wt.%, preferably 22 to 25 wt.%, sodium citrate,
10 to 30 wt.%, preferably 17 to 23 wt.%, fatty acid sulfate,
20 to 35 wt.%, preferably 24 to 30 wt.%, betaine surfactant, in particular cocoamidopropyl betaine,
3 to 8 wt.-% tetra sodium-N,N-bis(carboxylatomethyl)-L-glutamate (GLDA), and
3 to 8 wt.-% sodium benzoate.

Further, the invention relates to a method for preparing a liquid soap, in particular a dishwashing soap, comprising the steps:

preparing the tablet, powder or granulate according to the above disclosure at a first location; and
preparing the liquid soap, in particular the dishwashing soap, at a second location by contacting the tablet, powder or granulate with water; wherein the first location is geographically different from the second location.

In embodiments, the method further comprises the steps:

packing the tablet, powder or granulate, or a variety of tablets, powders or granulates with a packing after preparing the tablet, powder or granulate; and
de-packing the tablet, powder or granulate or the variety of tablets, powders or granulates from the packing before preparing the liquid soap, in particular the dishwashing soap,

In embodiments, the amount of water used for preparing the liquid soap is from 10 ml to 1.000 ml, preferably from 100 to 500 ml and in particular from 200 to 300 ml, such as about 250 ml or 225 ml.
In embodiments of the method, the liquid soap is a dishwashing soap.
In embodiments of the method, the liquid soap has a viscosity in the range of 2000 to 9000 mPa s or in the range of 3000 to 8000 mPa s.
In embodiments of the method, 225 ml of the liquid soap have a viscosity in the range of 2000 to 9000 mPa s or in the range of 3000 to 8000 mPa s.
In embodiments of the method, 225 ml of the liquid soap have a pH (20°C) of 4 to 5, preferably of 4.2 to 4.6.
In order to adjust the viscosity and the cleaning performance, the customer can decide whether one, two or more tables, portions of the powder or of the granulate shall be dissolved in water.
All definitions and embodiments disclosed for the tablet, powder or granulate applies analogously to the method described above.
The instant invention also concerns a liquid soap, in particular a dishwashing soap, obtainable by the method described above. All definitions and embodiments disclosed for the tablet, powder or granulate applies analogously to the soap obtainable by the method described above.
The instant invention also concerns the use of a tablet, powder or granulate as described above for preparing a liquid soap product, in particular a dishwashing soap.
In an embodiment of the use, the liquid soap has a volume of 10 ml to 1.000 ml, preferably from 100 to 500 ml and in particular from 200 to 300 ml, such as about 250 ml or 225 ml.
In embodiments of the use, the liquid soap has a viscosity in the range of 2000 to 9000 mPa s or in the range of 3000 to 8000 mPa s.
In embodiments of the use, 225 ml of the liquid soap have a viscosity in the range of 2000 to 90000 mPa s or in the range of 3000 to 8000 mPa s.
All definitions and embodiments disclosed for the tablet, powder or granulate applies analogously to the use described above.
The invention is now described and further illustrated in the following non-limiting Examples.

Examples

A powder with the compositions (in [wt.%], based on the final composition) according to table 1 was prepared:

Ingredient	Ex. 1	Ex. 2
Citric acid	14.0%	14%
Na-citrate	23.9%	24.4%
FAS (C12-C18)	37.5%	20%
(at least 91 % FAS (C12-C18) further including Na sulfate)	(34.12% FAS (C12-C18) and 3.38 % Na sulfate)	(18,20% FAS (C12-C18) and 1.8 % Na sulfate)
CAPB powder	13%	30%
(at least 82% CAPB, ca. 15 % NaCl, max. 3% water)	(at least 10,66 CAPB, ca. 1,95% NaCl, thw balance being water (ca. 0,39%))	(at least 24,6% CAPB, 4,5% NaCL the balance being water (ca. 0,9%))
GLDA powder	5.3%	5.3%
Na-benzoate	5.3%	5.3%
Soda	0.6%	0.6%
Sophorolipid	0.2%	0.2%
Perfume	0.2%	0.2%

20 to 30 mg of the powder according to examples 1 and 2 was mixed in 225 ml water, which resulted in a liquid soap product with the following properties:

Ex. 1: viscosity 3000 to 6000 mPa s, dependent on the water hardness; pH 4.2 to 4.6 (20°C)
Ex. 2: viscosity 4000 to 8000 mPa s, dependent on the water hardness; pH 4.2 to 4.6 (20°C)

Claims

Tablet, powder or granulate comprising
- 15 to 40 wt.% of an anionic surfactant,

- 10 to 35 wt.% of an amphoteric surfactant and

- 5 to 20 wt.% of an organic acid,
wherein the tablet, powder or granulate is free from any thickeners.
Tablet, powder or granulate according to claim 1, wherein the anionic surfactant is selected from the group comprising alkyl benzenesulfonates, alkanesulfonates, olefin sulfonates, alkylether sulfonates, glycerol ether sulfonates, methyl ester sulfonates, sulfofatty acids, alkyl sulfates, fatty alcohol ether sulfates, glycerol ether sulfates, fatty acid ether sulfates, hydroxy mixed ether sulfates, monoglyceride (ether) sulfates, fatty acid amide (ether) sulfates, mono- and dialkyl sulfosuccinates, mono- and dialkyl sulfosuccinamates, sulfotriglycerides, amide soaps, ether carboxylic acids and salts thereof, fatty acid isethionates, fatty acid sarcosinates, fatty acid taurides, N-acylamino acids, preferably acyl lactylates, acyl tartrates, acyl glutamates and acyl aspartates, alkyl oligoglucoside sulfates, protein fatty acid condensates, alkyl (ether) phosphates and mixtures of two or more thereof, preferably selected from the group comprising fatty acid sulfate, fatty acid glutamate, fatty acid sulfonate, fatty acid sulfosuccinate and/or fatty acid sarcosinate, preferably, fatty acid sulfate.
Tablet, powder or granulate according to any of the preceding claims, wherein the amphoteric surfactant is selected from the group comprising betaines, alkylbetaines, alkylamidobetaines, aminopropionates, aminoglycinates, imidazolinium betaines, sulfobetaines and/or sultaines or a mixture of two or more thereof.
Tablet, powder or granulate according to any of the preceding claims, wherein the organic acid is selected from the group comprising citric acid, lactic acid, malic acid, tartaric acid, oxalic acid, oxalic acid, glucaric acid, gluconic acid, phenylsuccinic acid, succinic acid, and a mixture of two or more thereof, preferably is citric acid, malic acid, tartaric acid and oxalic acid, and a mixture of two or more thereof, preferably citric acid.
Tablet, powder or granulate according to any of the preceding claims, wherein the the tablet, powder or granulate is free from any thickeners, selected from the group comprising polymeric thickeners or a mixture of two or more thereof, wherein the thickener is preferably selected from the group comprising polysaccharides, starches, high molecular weight polyethylene glycol, polyacrylates, polyacrylamides, polyvinyl alcohol, polyvinyl pyrrolidone, and mixtures of two or more thereof; preferably, the the tablet, powder or granulate is free from xanthan gum, inulin, guar-guar, agar-agar, alginates and tyloses, carboxymethyl cellulose and hydroxyethyl cellulose , and mixtures of two or more thereof, and most preferred the tablet, powder or granulate is free from xanthan gum, inulin, or a mixture thereof.
Tablet, powder or granulate comprising according to any of the preceding claims, further comprising a preservative, preferably selected from the group consisting of benzoic acid, sorbic acid, phenoxyethanol, parabens, pentanediol, sodium anisate, dehydroacetic acid, potassium sorbate or a mixture of two or more thereof, preferably benzoic acid or a salt thereof.
Tablet, powder or granulate comprising according to any of the preceding claims, further comprising an additive, preferably selected from the group consisting of a stabilizer, a chelator, an antioxidant, a mineral salt, a dye, an olfactory compound, and a mixture of two or more thereof.
Tablet, powder or granulate comprising according to any of the preceding claims, further comprising a further surfactant selected from sophoro lipids, amino acid based surfactants, sugar based surfactants and/or fatty alcohol ethoxylates.
Tablet, powder or granulate comprising according to any of the preceding claims, further comprising a base, preferably sodium bicarbonate or sodium carbonate.
Tablet, powder or granulate comprising according to any of the preceding claims, wherein the weight ratio of the anionic surfactant to the amphoteric surfactant is from 3:1 to 1:1.
Method for preparing a liquid soap, in particular a dishwashing soap, comprising the steps:
- preparing the tablet, powder or granulate comprising according to any of the preceding claims at a first location; and

- preparing the liquid soap, in particular the dishwashing soap, at a second location by contacting the tablet, powder or granulate with water;
wherein the first location is geographically different from the second location.
Method according to claim 11, wherein the first location is the production facilities of a manufacturer of the tablet, powder or granulate and the second location is the premises of a customer.
Method according to claim 11 or 12, further comprising the steps:
- packing the tablet, powder or granulate or a variety of tablets, powders or granulates with a packing after preparing the tablet, powder or granulate comprising; and

- de-packing the tablet, powder or granulate or the variety of tablets, powders or granulates from the packing before preparing the liquid soap, in particular the dishwashing soap,
wherein the packing is carried out by the manufacturer and the de-packing is carried out by the customer.
Method according to any of the claims 11 to 13, wherein the amount of water used for preparing the liquid soap, in particular the dishwashing soap, is from 10 ml to 1.000 ml, preferably from 100 to 500 ml or 250 ml.
Method according to any of the claims 11 to 14, wherein the liquid soap, in particular the dishwashing soap, has a viscosity in the range from 2000 to 9000 mPa s, preferably from 3000 to 8000 mPa s.
Use of a tablet, powder or granulate comprising according to any of the claims 1 to 10 for preparing a liquid soap, in particular a dishwashing soap, preferably wherein the liquid soap, in particular the dishwashing soap, has a viscosity in the range from 2000 to 9000 mPa s, preferably from 3000 to 8000 mPa s.