WO2025237643A1 - Cleansing preparation containing rhamnolipids and dehydroxanthan gum - Google Patents

Abstract

The present invention relates to cosmetic cleansing preparations containing rhamnolipid and dehydroxanthan gum.

Description

Cleaning preparation containing rhamnolipids and dehydroxanthan gum

The present invention relates to cosmetic cleansing preparations containing rhamnoli-pide in combination with dehydroxanthan gum.

A person's outward appearance can be influenced and enhanced through the use of cosmetic products. Regular use of cleansing and care products ensures that people feel attractive, beautiful, and comfortable in their surroundings, and radiate this outwards.

The cleansing process serves the purpose of loosening and rinsing away dirt such as sweat residue or accumulated skin cells. For this purpose, shower gels and cleansing products typically contain anionic, non-ionic, or amphoteric surfactants. Since, in addition to removing external dirt particles, skin particles can also be removed, this can lead to dry skin or skin irritation. Therefore, it is important that a shower gel also cares for the skin. This can be achieved by using gentle cleansing products.

Surfactants are substances that enable the dissolution of organic, especially nonpolar, substances in water. Furthermore, surfactant molecules are amphiphilic and composed of a hydrophilic and a lipophilic unit. This allows them to bind to the interface between the aqueous and lipid phases, facilitating the dissolution of dirt and the rinsing away of lipid-containing soils. Surfactants can be described by their HLB value (hydrophilic-lipophilic balance), which represents a measure of the ratio of these two functional groups within the surfactant molecule. Surfactants typically exhibit an HLB value of 13–15.

Consumers increasingly prefer cleaning products based on sustainable ingredients, which is why biosurfactants are being used more frequently. Biosurfactants are defined as surfactants that can be derived from renewable resources and are also biodegradable. The manufacturing process can thus be sustainable, for example, through fermentation. Biosurfactants are considered mild surfactants. Known biosurfactants include glycolipids, lipopeptides, fatty acids, and phospholipids. Rhamnolipids are a class of glycolipids produced by biosynthesis in bacteria of the genus Pseudomonas aeruginosa, among other organisms. They can be purchased, for example, under the trade name Rheance® one from Evonik. Rhamnolipids can be described by the following general structural formula (I):

Where m = 1 or 0,

N = 1 or 0,

R1 and R2 are independently identical or different organic residues with 2 to 30, preferably 5 to 24, carbon atoms, in particular a substituted or unsubstituted, branched or unbranched alkyl residue, which may also be unsaturated, wherein the alkyl residue is preferably a linear saturated alkyl residue with 6 to 20 carbon atoms. Salts of these compounds are also included according to the invention. The term "di-rhamnolipid" refers to compounds of the above formula or their salts in which n = 1. Similarly, "mono-rhamnolipid" refers to compounds of the above formula or their salts in which n = 0.

Rhamnolipids are, by definition, not anionic surfactants within the meaning of this invention.

Besides its cleansing effect and skin compatibility, customers have other requirements for a cosmetic cleansing product. For example, it is advantageous if cleansing preparations for use in the shower have a pleasant consistency. It is also desirable for the shower gel to be transparent, as this suggests to the customer, even upon dispensing the product, that it is a cleansing agent. Furthermore, it is possible to... to incorporate effect substances, such as color pigments or peeling particles, into transparent cleansing preparations, thus making the use of a shower gel more pleasant for the consumer.

Furthermore, the viscosity of the shower gel when dispensing it from the packaging is important, as a pleasant experience is desired. The cleansing product should be easy to remove from the packaging with a smooth, even flow and without requiring much effort. It should then spread easily on the skin. Accordingly, the viscosity of the product must be such that it allows for easy and complete dispensing and distribution. Additionally, the viscosity of the cleansing product must meet the requirements of the specific packaging. For packaging with a pump, the viscosity must be at least 1000 mPa s. For packaging with a flip-top cap, the cleansing product should have a viscosity between 1000 and 4000 mPa s, and for tube packaging, the viscosity should be in the range of 2000 to 6000 mPa s.

Conventional cleaning preparations are water-based, and therefore thickeners are needed to achieve the desired viscosity.

Cleaning preparations containing rhamnolipids in combination with xanthan gum are already known to those skilled in the art. However, the disclosed preparations did not provide any indication of the present invention.

DE102018220913 describes the use of rhamnolipids in O/W emulsions.

WO2013098066 describes the use of rhamnolipids in combination with xanthan gum in a shower gel.

EP4140472 A1 describes the use of rhamnolipids with at least one other surfactant under the formation of micelles for the removal of make-up.

EP3775125 describes the use of rhamnolipids with the preservative glydant. Therefore, the object of the present invention was to provide aqueous cosmetic cleansing preparations which have a high viscosity through the use of rhamnolipids.

Another object of the present invention was to provide cosmetic cleansing preparations which exhibit high transparency through the use of rhamnolipids.

Surprisingly for those skilled in the art, it has now been found that the problem of a transparent appearance combined with high viscosity of a cleaning preparation could be solved by the present invention.

The present invention relates to an aqueous cosmetic cleansing preparation containing rhamnolipids and dehydroxanthan gum.

Advantageously, the cleaning preparation according to the invention can be used as a washing gel for face and body.

Any viscosity values given in this disclosure refer to measurements taken at 25°C in a 150 ml wide-mouth bottle (VWR No.: 807-001) using the Rheomat R 123 from proRheo GmbH. The Rheomat R 123 is a rotational viscometer, meaning that a measuring element rotates within the substance being measured. The force required to rotate the measuring element within the sample at a predetermined speed is measured. The viscosity is then calculated from this torque, the rotational speed of the measuring element, and the geometric dimensions of the measuring system. The measuring element used is No. 1 (article no. 200 0191), suitable for a viscosity range up to 10,000 mPa s and a rotational speed of 62.5 ^min⁻¹ . Unless otherwise specified, the viscosity measurement is always performed 24 hours after preparation of the sample.

The transparency of a cleaning preparation can be determined by measurements using transmission spectroscopy. Any transmission values given in this disclosure refer to measurements taken with a SPECORD® UV/VIS spectrophotometer from analysek-jena. For these measurements, the transmission of the respective cleaning preparations was measured at wavelengths of 420 nm, 600 nm, 650 nm, 900 nm, and 950 nm in a 10 mm disposable cuvette. A reference was used against Deionized water was measured. The transparency of the cleaning preparations was determined by the transmission value (%T) at 420 nm and 600 nm.

Where weight percentages (wt%) are given below without reference to a specific composition or mixture, these percentages always refer to the total weight of the cosmetic cleansing preparation. Where ratios of components/substances/groups of substances are disclosed below, these ratios refer to the weight ratios of the components/substances/groups of substances mentioned.

The terms “according to the invention”, “advantageous according to the invention”, “advantageous in the sense of the present invention”, etc., always refer, within the scope of the present disclosure, to both the preparation according to the invention and the use according to the invention.

Unless otherwise stated, all tests were conducted under standard conditions. "Standard conditions" means 20°C, 1013 hPa, and a relative humidity of 50%.

When the term skin is used, it preferably refers to human skin.

The cleaning preparation according to the invention is characterized in that it contains rhamnolipids, in particular mono-, di- or polyrhamnolipids. Furthermore, it is advantageous if the total proportion of these rhamnolipids is from 0.5 to 12.0 wt.%, preferably from 1.0 wt.% to 10 wt.% and particularly preferably from 2.0 to 8.0 wt.%, based on the total weight of the preparation.

Dehydroxanthan gum is a polysaccharide available in powder form. It is obtained as a product of the dehydration of xanthan gum and can be purchased commercially from AkzoNobel under the trade name Amaze® XT.

According to the invention, the cleaning preparation comprises dehydroxanthan gum. It is advantageous if the total proportion of dehydroxanthan gum is in the range of 0.1 wt.% to 10.0 wt.%, preferably 0.5 wt.% to 8.0 wt.%, and particularly preferably 1.0 wt.% to 6.0 wt.%, based on the total weight of the preparation. It was extremely surprising to the person skilled in the art that even with the addition of small amounts of dehydroxanthan gum of 0.1 to 1.6 wt.%, preferably 0.3 to

At 1.3 wt% and particularly preferably 0.5 to 1.2 wt%, an increase in viscosity was observed while maintaining a consistently high level of transparency in the cleaning preparation. Other polymers intended to produce these effects generally require a significantly higher concentration and exhibit a deterioration in transparency.

It can be advantageous if the cleaning preparation according to the invention also comprises at least one surfactant that is not a biosurfactant. Surfactants can be described by their HLB value (hydrophile-lipophile balance), which is a measure of the ratio of these two functional groups in the surfactant molecule. Surfactants have an HLB value of 13–15. Preferably, the formulation according to the invention comprises surfactants with non-ionic, anionic, amphoteric, and/or zwitterionic structures that are not biosurfactants.

A preferred embodiment contains non-ionic surfactants selected from the group: fatty acid alkanolamides of general formula (II) where R ³ is a linear or branched, saturated or unsaturated alkyl or al-kenyl group with 8 to 24 carbon atoms, R ⁴ each represents a hydrogen atom or a -(CH ₂ )nOH group in which n can take the numbers 2 or 3, provided that at least one of the groups R ⁴ is a -(CH2) _n OH group, for example Cocamide MEA/ DEA /Ml PA;

- Alkyl polyglycosides, such as preferably lauryl glucoside, caprylyl glucoside, capryl glucoside, decyl glucoside and coco-glucoside.

Preferred embodiments of the invention are characterized in that they contain alkyl polyglycosides as non-ionic surfactants, specifically lauryl glucoside, caprylyl glucoside, capryl glucoside, decyl glucoside, and/or coco-glucoside, and particularly preferably decyl glucoside and/or coco-glucoside. Decyl glucoside and/or coco-glucoside are selected as the most preferred non-ionic surfactants from the foregoing group. The cosmetic cleansing preparation according to the invention contains alkyl glycosides, specifically lauryl glucoside, caprylyl glucoside, capryl glucoside, and decyl glucoside. and/or coco-glucosides, it is preferred if the total proportion of alkyl polyglycosides is from 0.5 wt.% to 7.0 wt.%, preferably from 1.5 wt.% to 5.0 wt.%, and particularly preferably from 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation.

It can be advantageous if the cleaning preparation according to the invention contains at least one amphoteric and/or zwitterionic surfactant. Advantageously suitable amphoteric and/or zwitterionic surfactants are:

- Acyl-/dialkylethylenediamine, in particular sodium acylamphoacetate, disodium acylamphodipropionate, disodium alkylamphodiacetate, disodium cocoamphodiacetate, sodium cocoamphomonoacetate, sodium acylamphohydroxypropylsulfonate, disodium acylamphodiacetate and sodium acylamphopropionate;

N-Alkyl amino acids, in particular aminopropylalkylglutamide, alkylaminopropionic acid, sodium alkylimidodipropionate and lauroamphocarboxyglycinate;

Betaine, in particular Coco Betaine, Cocamidopropyl Betaine; and Sultaine, in particular Lauryl Hydroxy Sultaine.

Particularly advantageous are the amphoteric and/or zwitterionic surfactants known under the INCI names Sodium Cocoamphoacetate, Disodium Cocoamphodiacetate, Sodium Cocoamphopropionate, Disodium Cocoamphodipropionate, Coco Betaine, Lauryl Betaine and/or Cocamidopropyl Betaine. From the above group, Sodium Cocoamphoacetate, Coco Betaine and/or Cocamidopropyl Betaine are selected as the most preferred amphoteric and/or zwitterionic surfactants.

Advantageously, the total proportion of amphoteric and/or zwitterionic surfactants, in particular the amphoteric and/or zwitterionic surfactants previously listed as particularly advantageous, in the cosmetic cleaning preparation according to the invention is 0.5 wt.% to 7.0 wt.%, preferably 1.5 wt.% to 5.0 wt.%, and particularly preferably 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation.

A preferred embodiment of the invention is characterized in that Coco Betaine is contained in the cosmetic cleaning preparation according to the invention in a proportion of 0.5 wt.% to 7.0 wt.%, preferably 1.5 wt.% to 5.0 wt.% and particularly preferably 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation. Another preferred embodiment of the invention is characterized in that sodium cocoamphoacetate is contained in the cosmetic cleaning preparation according to the invention in a proportion of 0.5 wt.% to 7.0 wt.%, preferably 1.5 wt.% to 5.0 wt.% and particularly preferably 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation.

Another preferred embodiment of the invention is characterized in that cocamidopropyl betaine is contained in the cosmetic cleaning preparation according to the invention in a proportion of 1.0 wt.% to 7.0 wt.%, preferably 1.5 wt.% to 5.0 wt.% and particularly preferably 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation.

It may be advantageous if the cleaning preparation according to the invention contains at least one anionic surfactant selected from the group:

- Acylglutamate, in particular Sodium Acylglutamate, Disodium Acylglutamate, Sodium Caprylic/Capric Glutamate, Sodium Cocoyl Glutamate, Disodium Cocoyl Glutamate, Sodium Lauroyl Glutamate, Sodium Myristoyl Glutamate, Sodium Stearoyl Glutamate and/or Sodium Oleoyl Glutamate;

- Acylsarcosinates, in particular Sodium Myristoyl Sarcosinate, Sodium Oleoyl Sarcosinate, TEA-lauroyl Sarcosinate, Sodium Lauroyl Sarcosinate and/or Sodium Cocoyl Sarcosinate;

- Acyltaurates, in particular Sodium Lauroyl Taurate and/or Sodium Methyl Cocoyl Taurate;

- Acyl lactylates, especially Sodium Lauroyl Lactylate, and/or Sodium Caproyl Lactylate;

- Acylglycinates, especially Sodium Cocoyl Glycinate.

Preferred embodiments of the invention are characterized in that they contain acylglutamates and, in particular, disodium cocoyl glutamates as anionic surfactants.

A preferred embodiment of the invention is characterized in that disodium cocoyl glutamate is contained in the cosmetic cleaning preparation according to the invention in a proportion of 0.5 wt.% to 7.0 wt.%, preferably 1.5 wt.% to 5.0 wt.% and particularly preferably 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation. Furthermore, it is preferred in accordance with the present invention if the cleaning preparation is free of sulfate-containing surfactants, in particular sodium laureth sulfate, sodium lauryl sulfate, ammonium lauryl sulfate, Ml PA-laureth sulfate and/or ammonium laureth sulfate.

Advantageous embodiments of the cleaning preparation according to the invention are characterized in that the total proportion of all contained surfactants is from 1.0 to 12.0 wt.%, preferably from 4.0 wt.% to 10 wt.% and particularly preferably from 6.0 to 9.0 wt.% based on the total weight of the cosmetic preparation.

It is preferred if the cleaning preparation according to the invention contains no other polymeric thickening agents besides dehydroxanthan gum. Polymeric thickening agents are defined as substances or mixtures of substances that are capable of increasing the viscosity of a cosmetic preparation.

It can be advantageous if the cleaning preparation according to the invention contains at least one humectant. Humectants are substances or mixtures of substances that give cosmetic preparations the property of reducing the loss of moisture from the stratum corneum (also called transepidermal water loss (TEWL)) and/or positively influencing the hydration of the stratum corneum after application or distribution on the skin surface. Advantageous humectants (moisturizers) within the meaning of the present invention are, for example, glycerin, lactic acid (INCI: Lactic Acid) and/or lactates, in particular sodium lactate (INCI: Sodium Lactate), 1,2-hexanediol (INCI: 1,2-Hexanediol), ethylhexylglycerin, butylene glycol (INCI: Butylene Glycol), methylpropanediol (INCI: Methylpropanediole), propanediol (INCI: Propylene Glycol), biosaccharide gum-1, glycine, sorbitol, glyceryl glucoside, panthenol, hyaluronic acid, pyrrolidone carboxylic acid, 1,2-octanediol (INCI: Caprylyl Glycol) and urea.

If 1,2-hexanediol is included, it is advantageous if the proportion of this component is 0.1 to 1.0 wt.%, preferably 0.2 to 0.9 wt.% and particularly preferably 0.4 to 0.8 wt.% based on the total weight of the cleaning preparation. If glycerin is included, it is advantageous if the proportion of this component is from 1.0 wt.% to 10.0 wt.%, preferably from 2.0 wt.% to 7.0 wt.%, and particularly preferably from 2.5 wt.% to 5.5 wt.%, based on the total weight of the cleaning preparation.

If caprylyl glycol is included, it is advantageous if the proportion of this component is 0.05 to 1.0 wt.%, preferably 0.1 to 0.7 wt.% and particularly preferably 0.1 to 0.5 wt.% based on the total weight of the cleaning preparation.

If glyceryl glucoside is included, it is advantageous if the proportion of this component is from 0.5 wt.% to 10.0 wt.%, preferably from 2.0 wt.% to 4.0 wt.%, and particularly preferably from 2.5 wt.% to 5.0 wt.%, based on the total weight of the cleaning preparation.

If sorbitol is included, it is advantageous if the proportion of this component is from 0.5 wt.% to 10.0 wt.%, preferably from 1.0 wt.% to 7.0 wt.%, and particularly preferably from 2.5 wt.% to 5.0 wt.%, based on the total weight of the cleaning preparation.

The preparation according to the invention may advantageously contain preservatives. Preservatives are those preservative substances that are authorized for use in cosmetic products in accordance with the German Cosmetics Regulation and Regulation (EC) No. 1223/2009 on cosmetic products for use in cosmetic products in Europe.

The at least one preservative can advantageously be selected from the group consisting of phenoxyethanol, methylparaben, sodium benzoate (INCI: Sodium Benzoate) and/or benzyl alcohol (INCI: Benzyl Alcohol). Advantageously, the proportion of the at least one preservative, in particular the preservatives previously listed as particularly advantageous, in the cleaning preparation according to the invention is 0.1 wt.% to 2.0 wt.%, preferably 0.4 wt.% to 1.5 wt.%, and particularly preferably 0.7 wt.% to 1.1 wt.%, based on the total weight of the cleaning preparation.

A preferred embodiment of the invention is characterized in that phenoxyethanol is present in the cosmetic cleaning preparation according to the invention in a proportion of 0.1 wt.% to 2.0 wt.%, preferably 0.4 wt.% to 1.5 wt.%, and particularly preferably contains 0.7 wt.% to 1.0 wt.%, based on the total weight of the cleaning preparation.

The preparation according to the invention may advantageously contain ethanol. If ethanol is included, it is advantageous if the proportion of this component is from 0.5 wt.% to 10.0 wt.%, preferably from 2.0 wt.% to 8.0 wt.%, and particularly preferably from 3.5 wt.% to 6.0 wt.%, based on the total weight of the cleaning preparation.

Furthermore, it is advantageous if the cosmetic cleaning preparations according to the present invention contain water as a cosmetic carrier, wherein water is contained in a proportion of 60 wt.% to 90 wt.%, preferably 65 wt.% to 85 wt.%, based on the total weight of the cleaning preparation.

Furthermore, it has proven advantageous if the preparation according to the invention contains buffer substances for adjusting the pH value. Advantageous buffer substances include citric acid (INCI: Citric Acid) and its salts and/or lactic acid or its salts. If lactic acid or its salts are included, it is advantageous if the proportion of these components is 0.01 to 1.0 wt.%, preferably 0.1 to 0.7 wt., based on the total weight of the cleaning preparation.

Furthermore, the preparation according to the invention can advantageously contain urea (INCI: Urea). If urea is included, it is advantageous if the proportion of this component is from 0.1 wt.% to 10.0 wt.%, preferably from 1.0 wt.% to 6.0 wt.%, and particularly preferably from 2.5 wt.% to 5.5 wt.%, based on the total weight of the cleaning preparation.

To incorporate lipophilic components, especially perfumes and/or emollients, into aqueous, transparent cleaning preparations, solubilizers are used. In cosmetic products, polyethylene glycol derivatives (PEG derivatives) such as PEG-7 Glyceryl Cocoate, PEG-40 Hydrogenated Castor Oil, PEG-20 Glyceryl Triisostearate, polysorbate, and/or PEG-60 Hydrogenated Castor Oil are particularly common for this purpose. It has proven advantageous in the sense of the invention if the cleaning preparation according to the invention is free of PEG derivatives, in particular PEG-7 Glyceryl Cocoate, PEG-40 Hydrogenated Castor Oil, PEG-20 Glyceryl Triisostearate, Polysorbate and/or PEG-60 Hydrogenated Castor Oil.

The cleaning preparations according to the invention may advantageously contain at least one or more perfume substances that are liquid under normal conditions. Beneficial perfume ingredients are selected from the group of essential oils, including geraniol, geranyl acetate, linalool, linalyl acetate, tetrahydrolinalool, citronellol, citronellyl acetate, dihydromyrcenol, dihydromyrcenyl acetate, tetrahydromyrcenol, terpineol, terpinyl acetate, nopol, nopyl acetate, 2-phenyl benzyl alcohol, benzyl acetate, benzyl salicylate, benzyl benzoate, styrallyl acetate, amyl salicylate, dimethylbenzylcarbinol, trichloromethylphenylcarbinyl acetate, p-tert-butylcyclohexyl acetate, isononyl acetate, vetiveryl acetate, alpha-hexylcinnamaldehyde, 2-methyl-3-(p-tert-butylphenyl)propanol, 2-methyl-3-(p-isopropylphenyl)propanal, and 3-(p-tert-butylphenyl)propanal. Tricyclodecenyl acetate, tricyclodecenyl propionate, 4-(4-hydroxy-4-methylpentyl)-3-cyclohexenecarbaldehyde, 4-(4-methyl-3-pentenyl)-3-cyclohexenecarbaldehyde, 4-acetoxy-3-pentyltetrahydro-pyran, methyldihydrojasmonate, 2-heptylcyclopentanone, 3-Methyl-2-pentylcyclopentanone, n-decanal, 9-decenol-1, phenoxyethyl isobutyrate, phenylacetaldehyde dimethyl acetal, phenylacetaldehyde diethyl acetal, geranonitrile, citronellonitrile, cedryl acetate, 3-isocamphylcyclohephane, ethine, heliotropin, coumarin, eugenol, vanillin, Diphenyloxide, Hydroxycitronellal, Ionone, Methylionone, Isomethyl ionone, iron, cis-3-hexenol and its esters, indane musk fragrances, tetralin musk fragrances, isochromane musk fragrances, macrocyclic ketones, macrolactone muscrown, macrolactone muscrown brassylate, and aromatic nitro musk fragrances. Other perfume components that may be present but are not expressly preferred are listed in Arctander, Perfume and Flavor Chemicals (Chemicals) Vols. I and II (1969) and Arctander, Perfume and Flavour Materials of Natural Origin (1960).

If perfume substances are included, it is advantageous if the proportion of these components is from 0.001 wt.% to 2.0 wt.%, preferably from 0.005 wt.% to 1.5 wt.%, particularly preferably from 0.01 wt.% to 1.4 wt.%, based on the total weight of the cleaning preparation.

The cleaning preparations according to the invention can advantageously contain emollients. Emollients according to the invention are from the group consisting of triglycerides, avocado oil, macadamia oil, grapeseed oil, but also jojoba oil, Butyrospermum Parkii (Shea) Seed Oil, squalane, lipophilic active ingredients such as flavonoids, bisabolol, and vitamin E. From the aforementioned group, Cocoglycerides are selected as preferred emollients. If emollients are included, it is advantageous if the proportion of these components is from 0.1 wt.% to 1.5 wt.%, preferably from 0.2 wt.% to 1.0 wt.%, and particularly preferably from 0.3 wt.% to 0.8 wt.%, based on the total weight of the cleaning preparation.

Furthermore, it has proven advantageous in the sense of the invention if the cleaning preparation has a pH value of 5.5 to 9.0, preferably 5.8 to 8.0, and particularly preferably 6.0 to 7.0.

It is advantageous if the cleaning preparation according to the invention does not contain any substances that release formaldehyde. Formaldehyde should be avoided in cosmetic products because it is suspected of causing cancer and allergies. One formaldehyde-releasing preservative is DMDM hydantoin (glydant). It is advantageous within the scope of the present invention if the cleaning preparation is free of DMDM hydantoin (glydant).

The values for the viscosity and transmission of the cleaning preparations according to the invention are determined by the measurement methods described above.

The cleaning preparation according to the invention is advantageously characterized in that it has a viscosity of preferably 500 to 10000 mPa s, preferably 1500 to 5000 mPa s, and particularly preferably 2000 to 4000 mPa s under normal conditions.

The cleaning preparation according to the invention is advantageously characterized in that it is transparent under normal conditions. The cleaning preparation according to the invention exhibits a transmission (determined at 420 nm and 600 nm) of advantageously 60 to 99%, more preferably 65 to 98%, and particularly preferably 70 to 97%.

Comparative experiments and examples

The following examples are intended to illustrate the present invention without limiting it. Unless otherwise stated, all quantities, proportions, and percentages are based on the weight and total quantity or total weight of the preparations.

The following formulations were prepared for the comparative trials.

Examples 1 to 7 are not in accordance with the invention, while examples 1 to 8 are in accordance with the invention:

The cleaning preparations listed above were produced, and their properties were investigated in a comparative test with regard to their viscosity and transparency. For cleaning preparations containing the inventive combination of rhamnolipids and dehydroxanthan gum, it was shown that the transparency could be significantly increased. Furthermore, compared to the reference preparations, the inventive cleaning preparations demonstrated that a high viscosity could be achieved even with a lower concentration of biopolymer.

The following examples are intended to further illustrate the invention without limiting it:

Claims

Patent claims 1. Aqueous cosmetic cleansing preparation containing rhamnolipids and dehydroxanthan gum. 2. Cleaning preparation according to claim 1, characterized in that the total proportion of these rhamnolipids is from 0.5 to 12.0 wt.%, preferably from 1.0 wt.% to 10 wt.% and particularly preferably from 2.0 to 8.0 wt.% based on the total weight of the cosmetic preparation. 3. Cleaning preparation according to one of the preceding claims, characterized in that the total proportion of dehydroxanthan gum is from 0.1 wt.% to 10.0 wt.% preferably from 0.5 wt.% to 8.0 wt.% and particularly preferably from 1.0 wt.% to 6.0 wt.% based on the total weight of the cosmetic preparation. 4. Cleaning preparation according to one of the preceding claims, characterized in that it is free of sulfate-containing surfactants. 5. Cleaning preparation according to one of the preceding claims, characterized in that it contains non-ionic surfactants. 6. Cleaning preparation according to one of the preceding claims, characterized in that it contains alkyl polyglycosides, in particular lauryl glucosides, caprylyl glucosides, capryl glucosides, decyl glucosides and/or coco-glucosides, as non-ionic surfactants. 7. Cleaning preparation according to one of the preceding claims, characterized in that it contains lauryl glucosides, caprylyl glucosides, capryl glucosides, decyl glucosides and/or coco-glucosides, wherein the total proportion of the alkyl polyglycosides is from 0.5 wt.% to 7.0 wt.%, preferably from 1.5 wt.% to 5.0 wt.% and particularly preferably from 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation. 8. Cleaning preparation according to one of the preceding claims, characterized in that it contains amphoteric and/or zwitterionic surfactants. 9. Cleaning preparation according to one of the preceding claims, characterized in that it contains as amphoteric and/or zwitterionic surfactants, in particular sodium cocoamphoacetate, disodium cocoamphodiacetate, sodium cocoamphopropionate, disodium cocoamphodipropionate, coco betaine, lauryl betaine and/or cocamidopropyl betaine. 10. Cleaning preparation according to one of the preceding claims, characterized in that it contains sodium cocoamphoacetate, disodium cocoamphodiacetate, sodium cocoamphopropionate, disodium cocoamphodipropionate, coco betaine, lauryl betaine and/or cocamidopropyl betaine, wherein the total proportion of the amphoteric and/or zwitterionic surfactants is from 0.5 wt.% to 7.0 wt.%, preferably from 1.5 wt.% to 5.0 wt.%, and particularly preferably from 2.0 wt.% to 4.5% by weight, based on the total weight of the cleaning preparation. 11. Cleaning preparation according to one of the preceding claims, characterized in that it contains anionic surfactants. 12. Cleaning preparation according to one of the preceding claims, characterized in that acylglutamates, in particular disodium cocoyl glutamates, are included as anionic surfactants. 13. Cleaning preparation according to one of the preceding claims, characterized in that it contains disodium acyl glutamate, wherein the total proportion of acyl glutamate is from 0.5 wt.% to 7.0 wt.%, preferably from 1.5 wt.% to 5.0 wt.% and in particular preferably from 2.0 wt.% to 4.5 wt.%, based on the total weight of the cleaning preparation. 14. Cleaning preparation according to one of the preceding claims, characterized in that the total proportion of all containing surfactants is 1.0 to 12.0 wt.%, preferably 4.0 wt.% to 10 wt.% and particularly preferably 6.0 to 9.0 wt.% based on the total weight of the cosmetic preparation. 15. Cleaning preparation according to one of the preceding claims, characterized in that it does not contain any further polymeric thickening agents, in particular xanthan gum. 16. Cleaning preparation according to one of the preceding claims, characterized in that it contains glycerin, wherein it is advantageous if the proportion of glycerin is from 1.0 wt.% to 10.0 wt.%, preferably from 2.0 wt.% to 7.0 wt.% and particularly preferably from 2.5 wt.% to 5.5 wt.%, based on the total weight of the preparation. 17. Cleaning preparation according to one of the preceding claims, characterized in that it contains phenoxyethanol, wherein it is advantageous if the proportion of phenoxyethanol is from 0.1 wt.% to 2.0 wt.%, preferably from 0.4 wt.% to 1.5 wt.% and particularly preferably from 0.7 wt.% to 1.0 wt.%, based on the total weight of the preparation. 18. Cleaning preparation according to one of the preceding claims, characterized in that it contains urea, wherein it is advantageous if the proportion of urea is from 0.1 wt.% to 10.0 wt.%, preferably from 1.0 wt.% to 6.0 wt.%, and particularly preferably from 2.5 wt.% to 5.5 wt.%, based on the total weight of the preparation. 19. Cleaning preparation according to one of the preceding claims, characterized in that it contains lactic acid, 1,2-hexanediol and/or caprylyl glycol. 20. Cleaning preparation according to one of the preceding claims, characterized in that it is free of PEG derivatives. 21. Cleaning preparation according to one of the preceding claims, characterized in that the pH value is from 5.5 to 9.0, preferably from 5.8 to 8.0, particularly preferably from 6.0 to 7.0. 22. Cleaning preparation according to one of the preceding claims, characterized in that it contains perfume substances, wherein it is advantageous if the proportion of perfumes is from 0.001 wt.% to 2.0 wt.%, preferably from 0.005 wt.% to 1.5 wt.%, in particular preferably from 0.01 wt.% to 1.4 wt.%, based on the total weight of the cleaning preparation. 23. Cleaning preparation according to one of the preceding claims, characterized in that it does not contain DMDM hydantoin. 24. Use of the cleaning preparation according to any of the preceding claims to increase transparency. ```