FR3116451A1 - Process for cleaning human keratin materials and kit for implementing this process - Google Patents

Abstract

Process for cleaning human keratin materials and kit for implementing this process Method for cleaning external human keratin materials in contact with a cosmetic composition within which bubbles of a gas are present and/or are generated, the method comprising the step consisting in subjecting bubbles of the gas, present within of the cosmetic composition in the vicinity of the surface of said materials to be cleaned, to acoustic waves to cause them to collapse and generate a mechanical shock on the surface to be cleaned to remove the dirt therefrom. Figure for abstract: Fig.1

Description

Process for cleaning human keratin materials and kit for implementing this process

The present invention relates to the cleaning of human keratin materials.

Application JP 2007-311756 describes an ultrasonic cleaning device for cleaning a silicon wafer, a mask substrate, etc. The device comprises an ultrasonic transducer mounted in a nozzle through which a cleaning liquid passes, and a means for introducing a gas in order to generate bubbles in the cleaning liquid.

Application US 2012/0227761 describes a device for cleaning a surface, comprising on the one hand a chamber supplied with a liquid and communicating with an outlet duct opening onto the surface to be cleaned, an ultrasonic transducer transmitting acoustic energy to the liquid contained in the chamber and the outlet duct, and on the other hand a bubble generator for generating bubbles of a gas in the outlet duct. The bubble generator can be an electrochemical generator, the liquid containing for example a salt such as potassium chloride to make the liquid conductive of electricity. A surfactant can be added to prevent the bubbles from coalescing on their way through the outlet pipe to the surface to be treated, and to ensure that they have the required size when they reach the surface to be treated.

The application of the device to the cleaning of the skin, in particular the underside of the nails of a surgeon is envisaged, as well as the hands.

This request mentions the possible addition of surfactant to influence the size of the bubbles produced.

No cosmetic application for treating facial skin or hair is disclosed.

The invention aims to provide a process for cleaning human keratin materials, in particular the skin of the face or the hair, making it possible to effectively clean said materials.

The subject of the invention is thus a method for cleaning external human keratin materials in contact with a cosmetic composition within which bubbles of a gas are present and/or are generated, the method comprising the step consisting in subjecting gas bubbles, present within the cosmetic composition in the vicinity of the surface of said materials to be cleaned, to acoustic waves to cause them to collapse and generate a mechanical shock on the surface to be cleaned to remove the dirt therefrom.

This process is preferably cosmetic and, in particular, non-therapeutic.

The method according to the invention is preferably intended for topical application.

By “cosmetic composition” is meant a composition containing at least one cosmetic active ingredient, as defined in Cosmetics Directive 76/768/EEC.

According to the invention, mineral or running water does not constitute a cosmetic composition.

By “external human keratin materials”, is meant the skin and the appendages, in particular the hair and the nails, and the mucous membranes, for example the gums, are excluded. The area of skin which is treated according to the invention can be the skin of the face, of the bust, of the back, of the arms, of the legs, of the hands and/or of the feet, the scalp. The method according to the invention is particularly suitable for removing make-up and/or for cleaning the skin of the face, in particular the forehead, the cheeks, the chin, the nose, the scalp.

Among the undesirable stains that may be present on keratin materials (on the surface and/or anchored more deeply in the pores of the skin), we can distinguish exogenous impurities such as make-up, environmental pollution, dust, microorganisms, etc., and endogenous impurities or defects such as excess sebum, sweat, dead cells, dead skin, dandruff, blackheads, light and/or acne scars, pigmented spots , etc.

The method according to the invention makes it possible to effectively eliminate or treat both the exogenous impurities and the endogenous impurities or defects. Bubbles generate shock waves under the effect of acoustic waves, which can exert a mechanical effect on keratin materials. They can also contribute to the release of chemical species contributing to the cleaning of keratin materials, such as free radicals.

By "proximity to the surface of the said materials to be cleaned", it is necessary to understand sufficiently close so that the effect of the collapse of the bubbles under the action of the acoustic waves has a beneficial effect on the cleaning action. For example, bubbles are present at less than 5mm from the surface to be cleaned, better at less than 2mm, even better at less than 1mm.

In accordance with the invention, the composition advantageously has a total content of cleaning active(s) of at least 0.02% by mass relative to the total weight of the composition. With a total content of cleaning active ingredient(s) of at least 0.02% by mass, better still at least 0.05%, even better still at least 0.1%, relative to the total weight of the composition; thus, the composition can have a cleaning action also in the absence of the collapse of the bubbles by the acoustic waves. This content may be less than or equal to 20% by weight.

The cleaning active agents can contribute to the formation of bubbles and/or to their stabilization, being for example chosen from the compounds detailed below, in particular from foaming surfactants such as polyoxyalkylenated alkyl (amido) carboxylic acid anionic surfactants, surfactants anionic acids distinct from the aforementioned polyoxyalkylenated alkyl(amido) ether carboxylic acids, the nonionic surfactants, the amphoteric and zwitterionic surfactants, and their mixtures and/or are chosen from the compounds conventionally present in make-up removing compositions such as alkylpolysaccharides, polyethylene glycol fatty alcohols, oils, and mixtures thereof.

Acoustic waves

The acoustic waves are generated by one or more transducers, in particular ultrasonic. The acoustic waves are preferably ultrasonic waves.

The frequency of the acoustic waves ranges for example from 3 kHz to 5 MHz, better from 3 kHz to 1 MHz, even better from 10 kHz to 1 MHz, in particular from 10 kHz to 500 kHz.

The power of the acoustic waves ranges for example from 30 mW to 100W/cm² (with, in the case of high power, a sufficiently short duration not to cause damage to keratin materials, for example a duration less than or equal to 1s), better from 0.1 to 10 W/cm², even 1 to 7 W/cm².

The acoustic waves can be generated by a single transducer, or alternatively by at least two transducers. Each transducer may include a sonotrode, typically made of metal, which may define a surface through which the acoustic waves are emitted. Such a sonotrode can be made of metal, for example. The transducer may include at least one piezoelectric material.

The acoustic waves can be generated permanently as soon as the treatment device is put into operation, or alternatively be generated only when certain operating conditions are met, such as for example the presence of the composition in contact with the transducers and/or the presence of the device in contact with the area to be treated.

Acoustic waves can be generated by a sinusoidal signal or by a more complex shaped signal, for example frequency modulated or amplitude modulated. The acoustic waves are preferably emitted at a single frequency, which can make it possible to focus them more precisely in a given area, but as a variant can be emitted at several different frequencies. Acoustic waves can be emitted continuously or in the form of pulses.

The method can thus comprise a step of detecting the presence of the cosmetic composition in contact with the transducer(s), and condition the operation of the transducer(s) on this detection.

The method can also include a step of detecting the presence of the device in contact with the area to be treated and conditioning the operation of the transducer(s) on this detection.

This avoids the emission of acoustic waves in the absence of composition or when the device is not in a situation for treating keratin materials.

Preferably, the acoustic waves are emitted without the transducer or the associated sonotrode coming into contact with the area to be treated. This limits the acoustic energy emitted in the keratin materials.

A composition can be circulated continuously in contact with the transducer(s), with continuous operation of the transducer(s), or alternatively pulsed operation of the transducer(s). The composition supply can also be done on an impulse basis. There is advantageously a supply of a zone subjected to the acoustic waves which is discontinuous, with for example a period of supply of the zone when the acoustic waves are not generated, then a period when the composition present in the zone is subjected to acoustic waves without being renewed during this exposure. This can make it possible to prevent the bubbles present in the composition before entering said zone from being repelled by the acoustic waves present in the latter.

It is thus possible to slave the composition supply to the operation of the transducer(s) for the production of the acoustic waves or vice versa, and to have an impulsive operation of the transducer(s) and/or of the composition supply. In other words, we can proceed to a contribution of composition offset in time compared to the period of emission of the acoustic waves in the zone of contribution of the composition.

The propagation of the acoustic waves can be facilitated by the presence of liquid in the composition. The gas/liquid mass ratio within the composition can thus benefit from not being too high, and the composition can advantageously contain a thickener, as detailed below.

The transducer(s) used to generate the acoustic waves may have a surface in contact with the composition which ranges, for example, from the surface of a circle 5 mm in diameter to a circle 100 mm in diameter, better still the surface of a 5mm diameter circle to that of a 50mm circle, even better from the surface of a 5mm diameter circle to that of a 40mm circle.

The sonotrode can be given any shape adapted to that of the surface to be treated, if necessary.

The distance between the transducer(s) making it possible to generate the acoustic waves and the area to be treated can ultimately correspond substantially to the diameter of a bubble and preferably ranges from 100 microns to 40mm, better still from 100 microns to 10mm.

gas bubbles

The gas bubbles can be bubbles of air, CO ₂ , oxygen, hydrogen, nitrogen, among other possibilities, as well as a mixture of these gases.

All the bubbles can be bubbles of the same gas or, as a variant, the composition can comprise bubbles of a first gas and bubbles of a second gas, different from the first.

The gas can come from a decomposition of the composition or be extracted from it, or alternatively be introduced into the composition.

The diameter of the bubbles can range from 100 nm to 700 μm, better still from 500 nm to 50 μm . Size here designates the average size D ₅₀ in number at half the population.

The dimensionless factor γ equal to the ratio d/R _max , where d is the distance from the geometric center of the bubble to the surface to be cleaned when the expansion of the bubble is maximum, and R _max is the maximum diameter of expansion of the bubble, is preferably less than 3.5, better still less than 1.1 so as to have maximum efficiency, as detailed in the publication Mechanisms of single bubble cleaning, F. Reuter, Ultrasonics Sonochemistry 29 (2016) 550-562.

The density of the medium formed by the cosmetic composition with the gas bubbles, exposed to the acoustic waves, can be between 0.1 and 1 g/cm ³ , better still between 0.5 g and 1 g/cm ³ (at 20° C. and at atmospheric pressure ).

A small bubble size can facilitate their penetration into skin follicles, such as hair follicles, and thus exert an effective cleansing action therein. It may thus be advantageous for the bubbles to have a size less than or equal to 300 microns, better still to 200 microns, for example a size of 100 microns or less. The bubbles can then penetrate the follicles before being activated by the acoustic waves.

Generation of bubbles

The bubbles can be generated by any suitable means, for example by mechanical, physical, chemical or electrochemical means. The bubbles can in particular be generated by a depression in the liquid which makes it possible to lower the vapor pressure and to generate the formation of gas in the form of bubbles.

The generation of bubbles can be prior, simultaneous or cyclical with respect to the emission of acoustic waves.

By way of example of techniques that can be implemented to generate the bubbles in the invention, there are among others the techniques:

- decompression of liquids using nozzles for example, decompression can be preceded by pressurization,

- creation of a turbulent flow, in particular using rotating blades, a turbine, an ejector, a Venturi, a flow of gas or swirled liquid, a rotating porous body , in particular a rotating disc, a generator as described in the publication Performance of a new micro-bubble generator with a spherical body in a flowing water tube by M. Sadatomi Experimental Thermal and Fluid Science 29 (2005) 615- 623, a Venturi tube and a vortex, a Venturi as implemented by MEC Co. (Iona Shower), or shear forces,

- creation of a laminar flow through small openings, with focusing or co-focusing of the flow, of a porous membrane, using a porous membrane fluidic oscillator as described for example in the article Fluidic oscillator-mediated microbubble generation to provide cost effective mass transfer and mixing efficiency to the wastewater treatment plants Environ Res. 2015 Feb;137:32-9, of an emulsification microchannel as described in the article Monodispersed microbubble formation using microchannel technique; AIChE Journal, 50 (2004), p. 3227-3233, these techniques for creating bubbles by laminar flow through small openings being preferred to the previous ones because of the stability of the bubbles produced,

- energy supply,

light, for example by irradiating microfluidic channels coated with nanoporous gold, as described in Progress in Biomedical Optics and Imaging Proceedings of SPIE Volume 9705, 2016 Article number 97050D, Photothermal generation of microbubbles on plasmonic nanostructures inside microfluidic channels (Conference paper ), by laser irradiation, for example as described in An Experimental study on microbubble generation by laser induced breakdown in water; The review of Laser Engineering (Suppl.) (2008), pp. 1273-1275 (2), by laser irradiation on carbon nanotubes, as described in the article Producing single microbubbles with control size using microfiber Advance in Bioscience and Biotechnology, 2 (2011), pp. 385-390, by a tapered optical fiber, by a near-infrared plasmonic absorber, as described in the publication Size-controllable micro-bubble generation using a nanoimprinted plasmonic nanopillar array absorber in the near-infrared region. ; Applied Physics Letters. 108. 2016,

acoustic, for example by ultrasound as described in the article Ultrasonics Sonochemistry Volume 29, 1 March 2016, pp. 604-611, Influence of sonication conditions on the efficiency of ultrasonic cleaning with flowing micrometer-sized air bubbles, sound activation of microbubbles, ultrasound in the presence of nucleation sites, as described in application WO2016/055883,

electric, for example by an electrodynamic coaxial atomization process as described in the publication Preparation of microbubble suspensions by co-axial electrohydrodynamic atomization, Medical Engineering and Physics, 29 (2007), pp749-754, by electrolysis, electro flotation, by a micro electrolytic generator as described in the publication Micro-fabricated electrolytic micro-bubblers, International Journal of Multiphase Flow, 31 (2005), pp. 706-722, by electrostatic spraying as described in the publication Microbubble generation for environmental and industrial separations, Separation and Purification Technology, 11 (1997), pp. 221-232, by electrical heating of carbon nanotubes as described in the publication Microbubble generation with micro-watt power using carbon nanotubes heating elements; Proceedings of the 7th IEEE International Conference on Nanotechnology, August 2-5, 2007, Hong Kong (2007) or by microplasma, as described in the Journal of Physics D article; Applied Physics Volume 47 Issue 35, 3 September 2014, Article number 355203; Microbubble generation by microplasma in water.

The bubbles can be generated continuously, as soon as the device is put into operation. Alternatively, the bubbles are generated intermittently, for example only when the composition is dispensed, or in periods at a predefined frequency so as to give them time to disperse. A certain amount of bubbles may be present in the composition before the device is turned on.

The bubble production intensity can be constant or variable, and if necessary adjustable by the user or automatically by the device depending on the desired result or at least one operating parameter.

The bubbles can be generated by any of the techniques mentioned above, in particular by injection of a pressurized gas into the composition, by means of a pump for example or a reservoir of compressed gas, by electrolysis of the cosmetic composition, by stirring the composition, sucking a gas into the composition, or vaporizing a liquefied gas mixed with the composition or dissolved in the composition. The bubbles can come from the reaction of two liquids or of a liquid and at least one solid in the form, for example, of powder, granules, tablets, or any other form.

The flow of liquid containing the bubbles can range from 0.01 mL/s to 10 mL/s.

AT blaze

The method may comprise an abrasion of the keratin materials using abrasive particles and/or by a part of the device in contact with the keratin materials.

The abrasion can be carried out prior to the exposure of the cosmetic composition and the bubbles to the acoustic waves, or alternatively concomitantly. When abrasion is prior, it can be carried out by any means, in particular by mechanical or chemical action.

In this case, the abrasion of the keratin materials can be caused not only by the phenomenon of shock waves which follows the exposure of the bubbles to the acoustic waves, but also at least partly by the action of the abrasive particles impacting the surface to be treated.

The abrasive particles present in the cosmetic composition may be insoluble in the medium of the composition or, as a variant, soluble therein, and preferably then generate a gas during their dissolution, a gas which will then be used to generate all or part of the bubbles subjected to sound waves.

The abrasive particles can be chosen from abrasive powders of materials having a hardness on the Mohs scale greater than or equal to 3, for example powders of alumina, silica, aluminosilicates, carbonates, or a material coated with a silica, an alumina or an aluminosilicate

It may also be powdered fruit stones, in particular apricot, wood cellulose, for example ground bamboo stem, coconut shell, or a synthetic material such as polyamide, or of mixed particles combining organic and inorganic compounds, and the particles coated with the above compounds.

The abrasive particles can have a size of between 0.1 and 500 microns, in particular between 0.1 and 50 microns for the treatment of the hair, between 10 and 300 microns for the treatment of the scalp or the skin of the face.

The solid particles used to exert an abrasive action can have a flattened, spherical, elongated, blocky or irregular shape.

Recycling

Preferably, the cosmetic composition is sent into contact with the keratin materials so as to be at least partially recovered in order to be recycled.

The composition which is recovered can be filtered in order to be freed from solid debris or from its particulate phase, before being returned to the surface to be cleaned.

Preferably, the composition is recovered by suction or by absorption, for example using a porous support.

Application of the cosmetic composition

In general, the composition can in itself by virtue of its formulation already contribute to the removal of the impurities which it is desired to remove by the action of the bubbles subjected to the acoustic waves. The action of bubbles subjected to acoustic waves can accelerate or improve this process. Thus, the association of the wave generated by the collapse of the bubbles in combination with the action of the combination may synergistically have a greater effect than that of the waves alone or that of the composition alone.

The cosmetic composition can be applied initially, with bubbles already present within it, then exposed in a second stage, after its application to the keratin materials, to acoustic waves to cause shock waves following the collapse of the bubbles.

For example, the user first applies a cosmetic composition in the form of a foam to the area to be cleaned, for example by spraying it on said area, and then brings a treatment device into contact with the composition, to subject it to sound waves.

The cosmetic composition can also be applied in another way, and in particular continuously, that is to say that a circulation of the composition is established in contact with the keratin materials to be treated, this circulation being for example in a closed or open circuit.

When the circulation takes place in a closed circuit, the composition is at least partially recycled. An additional quantity of composition can be introduced permanently or intermittently into the circuit to compensate for losses.

In an open circuit, the composition is not recycled for the implementation of the process, and for example eliminated towards a collection tank or directly with the waste water.

The circulation of the composition is carried out for example with a flow rate of between 0.01 mL per second to 5 mL per second.

The bubbles can be formed when the cosmetic composition is already in contact with the keratin materials, using a bubble generator of the device, operating for example by electrolysis.

hand piece

The method can be implemented with a handpiece to be placed in contact with the keratin materials to be treated.

This handpiece can carry at least one ultrasonic transducer making it possible to generate the acoustic waves and can be arranged to maintain a surface for emitting the acoustic waves away from the surface to be treated.

The handpiece may include at least one flexible lip acting as a spacer to maintain this separation. This flexible lip can also participate in the confinement of the cosmetic composition in a space located between the surface to be treated and the transducer. This flexible lip can contribute to delivering, spreading, collecting and/or recycling the composition.

The cosmetic composition can be caused to circulate in a space, which may be modulated, located between a sonotrode of the handpiece and the area to be treated. This circulation can take place continuously, as mentioned above, or intermittently. It is also possible to fill said space with the composition while the handpiece is in place, then to generate the acoustic waves within the composition filling this space.

Selection of treated areas

The process can be implemented on all or part of the skin of the face, of the scalp or of the body, to clean the latter.

The area treated may in particular be an area of keratin materials coated with a make-up product such as a foundation, a lipstick, a blush, a mascara, an eyeliner, a powder, an emulsion, an oil or a sun protection product, among others, and the treatment may aim to eliminate this product.

The method can be implemented by moving a handpiece along the area to be treated, so as to treat the entire area covered by a makeup product or any substance that one wishes to remove.

The method can also be implemented to treat an area of skin not coated with a makeup product, in order to clean it thoroughly, and remove or treat exogenous or endogenous impurities or defects, for example dead skin cells, traces of sebum or sweat, dandruff, bacteria, traces of pollution, blackheads, pigmented spots, light scars or acne scars. The method can be implemented to treat the scalp. The process can still be implemented on the top of the nails to remove nail polish.

The method can also be implemented to clean the hair, in particular with a view to at least partially eliminating a coloring previously carried out.

Related processes

The process according to the invention can be preceded or followed by a cosmetic process such as makeup or massage.

For example, the skin, the hair or the eyelashes are made up, then the make-up is removed after a certain duration (for example less than 24 hours) by means of the cleaning process according to the invention.

In another example, the skin is cleansed by implementing the method according to the invention, then treatment is performed on the cleaned area (for example just after or less than two hours later), for example a massage and/or the application of a care composition.

Treatment kit

The invention also relates to a treatment kit for implementing the method according to the invention, as defined above.

This kit includes:

• the cosmetic composition in which the bubbles are generated,
• a device for exposing the bubbles to acoustic waves in the vicinity of the surface to be treated.

The composition can be packaged with the device in the same packaging.

Where appropriate, the composition is contained in a container arranged to be mounted on the device, this container constituting, for example, a cartridge arranged to be fixed in whole or in part in a corresponding housing of the device, or to be connected to the device by a suitable connection like a pipe.

Cosmetic composition

The composition may generally comprise any compound conventionally entering into the formulation of compositions for cleaning and/or caring for human keratin materials, compatible with the generation of sufficiently stable bubbles before the application of the acoustic waves.

Bubble stabilization

The cosmetic composition preferably contains at least one compound with a stabilizing action, such as surfactants, particulate compounds, salts, polymers or any type of compound making it possible to increase the lifespan of the bubble in its medium, helping to stabilize the bubbles, that is to say making it possible to prevent them from coalescing prematurely, before being subjected to the acoustic waves while being close to or in contact with the surface to be treated. The time that elapses between the moment the bubbles are generated and the moment they are subjected to the acoustic waves ranges, for example, from a few milliseconds to a few days.

It is known that several factors promote the formation and stability of bubbles:

• The amount of surfactant: the surfactants will preferably be available within the composition in the form of micelles, therefore in a concentration greater than the Critical Micellar Concentration (CMC: concentration from which the surfactants combine to form micelles) including once the bubbles have formed. To achieve this, the concentration of the surfactant in the product is preferably 5 to 10 times the CMC.

• The viscosity of the medium: a more viscous medium makes it possible to obtain more stable bubbles. For example, the use of polymers makes it possible to obtain this (eg proteins) and/or thickening agents.

• Water hardness: the foaming power of anionic surfactants is generally weakened in hard water due to Ca2+ and Mg2+ ions interacting with the surfactants.

• The nature of the gas used: the bubbles will be more stable if the gas used is not very soluble in water.

This compound with stabilizing action can also exert an action on the surface to be treated, in particular a mechanical, chemical and/or biological action.

The bubbles can be generated and/or stabilized by any suitable means, for example by the use of foaming surfactants such as polyoxyalkylenated alkyl (amido) ether carboxylic acid anionic surfactants, anionic surfactants other than polyoxyalkylenated alkyl (amido) ether carboxylic acids mentioned above, non-ionic surfactants, amphoteric and zwitterionic surfactants, and mixtures thereof and/or by the use of compounds conventionally present in make-up remover compositions such as alkyl polysaccharides, polyethylene glycols of fatty alcohols, oils, and their mixtures.

Foaming surfactants from which bubbles can be generated

As mentioned above, to generate the bubbles and/or contribute to stabilizing them, the composition suitable for the invention may comprise at least one foaming surfactant such as those chosen from (i) anionic surfactants alkyl (amido) ether carboxylic acids polyoxyalkylenated, (ii) anionic surfactants other than anionic surfactants (i), (iii) non-ionic surfactants, (iv) amphoteric/zwitterionic surfactants, and mixtures thereof.

The term “anionic surfactant” is understood to mean a surfactant comprising, as ionic or ionizable groups, only anionic groups.

In the present description, an entity is qualified as being "anionic" when it has at least one permanent negative charge or when it can be ionized into a negatively charged entity, under the conditions of use of the composition of the invention. (medium, pH for example) and not comprising any cationic charge.

An entity is qualified as being “nonionic” when it is neither cationic nor anionic within the meaning of the present application, in particular it does not comprise any cationic or anionic group within the meaning of the present application.

The term “amphoteric/zwitterionic surfactant” or “amphoteric and zwitterionic surfactant” is understood to mean a surfactant which contains central and balanced positive and negative charges, and which can therefore behave as an anionic or cationic surfactant adapting to the medium in which it is located. It becomes anionic in an alkaline medium and cationic in an acidic medium and is equivalent to a nonionic surfactant at neutral pH.

i) Polyoxyalkylenated alkyl(amido) ether carboxylic acid anionic surfactants

A composition suitable for the invention may comprise at least one polyoxyalkylenated alkyl (amido) carboxylic acid anionic surfactant.

The polyoxyalkylenated alkyl (amido) ether carboxylic acids which can be used are chosen from those of formula (1):

R1(OC ₂ H ₄ )nOCH ₂ COOA (1)

in which :

- R1 represents a linear or branched C ₆ -C ₂₄ alkyl or alkenyl group, a (C ₈ -C ₉ )alkylphenyl group, an R2CONH-CH ₂ -CH ₂ group - with R2 representing an alkyl or alkenyl group, linear or branched, C ₉ -C ₂₁ , preferably, R1 is a C ₈ -C ₂₀ alkyl group and more preferably a C ₈ -C ₁₈ alkyl group,

- n is an integer or a decimal number (average value) ranging from 2 to 24 and preferably from 2 to 10, and

- A represents a hydrogen, ammonium, Na, K, Li, Mg, Ca atom or a monoethanolamine or triethanolamine residue.

It is also possible to use mixtures of compounds of formula (1), in particular mixtures of compounds in which the R1 groups are different.

The polyoxyalkylenated alkyl(amido) ether carboxylic acids which are particularly preferred are those of formula (1) in which:

- R1 represents a C ₁₂ -C ₁₄ alkyl group, a cocoyl, oleyl, nonylphenyl or octylphenyl group,

- A represents a hydrogen or sodium atom, and

- n varies from 2 to 20, preferably from 2 to 10.

More preferentially, in the compounds of formula (1), R1 represents a C ₁₂ alkyl group, A represents a hydrogen or sodium atom, and n varies from 2 to 10.

It is possible to preferably use polyoxyalkylenated (C ₆ -C ₂₄ )alkyl ether carboxylic acids and their salts, polyoxyalkylenated (C ₆ -C ₂₄ )alkylamido carboxylic ether acids, in particular those comprising from 2 to 15 oxide groups of alkylene, their salts, and mixtures thereof.

When the anionic surfactant is in the form of a salt, said salt may be chosen from alkali metal salts, such as sodium or potassium salt, ammonium salts, amine salts and in particular salts of amino alcohols, and alkaline earth metal salts, such as magnesium salt.

Mention may be made, as examples of aminoalcohol salts, of monoethanolamine, diethanolamine or triethanolamine salts, monoisopropanolamine, diisopropanolamine or triisopropanolamine salts, 2-amino-2-methyl-1-propanol salts, 2-amino-2-methyl-1,3-propanediol salts and tris(hydroxymethyl)aminomethane salts.

Alkali or alkaline-earth metal salts, and in particular sodium or magnesium salts are preferably used.

Among the commercial products, the products sold by the company KAO under the following names can preferably be used:

AKYPO® NP 70 (R1= nonylphenyl, n=7, A = H)

AKYPO® NP 40 (R1= nonylphenyl, n=4, A = H)

AKYPO® OP 40 (R1= octylphenyl, n=4, A = H)

AKYPO® OP 80 (R1= octylphenyl, n=8, A = H)

AKYPO® OP 190 (R1= octylphenyl, n=19, A = H)

AKYPO® RLM 38 (R1=C ₁₂ -C ₁₄ alkyl, n=4, A = H)

AKYPO® RLM 38 NV (R1= C ₁₂ -C ₁₄ alkyl, n=4, A = Na)

AKYPO® RLM 45 CA (R1= C ₁₂ -C ₁₄ alkyl, n=4.5, A = H)

AKYPO® RLM 45 NV (R1= C ₁₂ -C ₁₄ alkyl, n=4.5, A = Na)

AKYPO® RLM 100 (R1= C ₁₂ -C ₁₄ alkyl, n=10, A = H)

AKYPO® RLM 100 NV (R1= C ₁₂ -C ₁₄ alkyl, n=10, A = Na)

AKYPO® RLM 130 (R1= C ₁₂ -C ₁₄ alkyl, n=13, A = H)

AKYPO® RLM 160 NV (R1= C ₁₂ -C ₁₄ alkyl, n=16, A = Na),

or by SANDOZ under the following names:

SANDOPAN DTC-Acid (R1 = C ₁₃ alkyl, n=6, A = H)

SANDOPAN DTC (R1= C ₁₃ alkyl, n=6, A = Na)

SANDOPAN LS 24 (R1= C ₁₂ -C ₁₄ alkyl, n=12, A = Na)

SANDOPAN JA 36 (R1= C ₁₃ alkyl, n=18, A = H),

and more particularly, the products sold under the following names:
AKYPO® RLM 45 (INCI: Laureth-5 carboxylic acid)

AKYPO®RLM 100

AKYPO® RLM 38.

The polyoxyalkylenated alkyl (amido) ether carboxylic acid anionic surfactants (i) may be present in an amount ranging from 0.001% to 20% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition.

(ii) Anionic surfactants distinct from polyoxyalkylenated alkyl(amido) ether carboxylic acid anionic surfactants (i)

A composition suitable for the invention may comprise at least one anionic surfactant (ii) distinct from the polyoxyalkylenated alkyl (amido) carboxylic acid anionic surfactants (i).

Said anionic surfactants (ii) may comprise in their structure one or more sulphate and/or sulphonate and/or phosphate and/or carboxylate groups, and/or mixtures of these groups, preferably sulphate groups.

Said anionic surfactants (ii) can be oxyethylenated and/or oxypropylene. The total average number of ethylene oxide (EO) and/or propylene oxide (PO) groups can then range from 1 to 50, in particular from 1 to 10.

The carboxylic anionic surfactants which can be used can therefore comprise at least one carboxylic or carboxylate function.

They can be chosen from the following compounds: acylglycinates, acyllactylates, acylsarcosinates, acylglutamates, alkyl-D-galactoside uronic acids, as well as the salts of these compounds; the alkyl and/or acyl groups of these compounds comprising from 6 to 30 carbon atoms, in particular from 12 to 28, even better from 14 to 24, or even from 16 to 22 carbon atoms; these compounds possibly being polyoxyalkylenated, in particular polyoxyethylenated, and preferably comprise from 1 to 50 units of ethylene oxide, even better from 1 to 10 units of ethylene oxide.

It is also possible to use C ₆ -C ₂₄ alkyl monoesters of polyglycoside polycarboxylic acids, such as C ₆ -C ₂₄ alkyl polyglycoside citrates, C ₆ -C ₂₄ alkyl polyglycoside tartrates and C ₆ -C ₂₄ alkyl polyglycoside sulfosuccinates, and their salts. Preferably, said anionic carboxylic surfactants are chosen from:

- acylglutamates, in particular C ₆ -C ₂₄ , or even C ₁₂ -C ₂₀ , such as stearoylglutamates, and in particular disodium stearoylglutamate;

- acylsarcosinates, in particular C ₆ -C ₂₄ , or even C ₁₂ -C ₂₀ , such as palmitoylsarcosinates, and in particular sodium palmitoylsarcosinate;

- acyllactylates, in particular C ₁₂ -C ₂₈ , or even C ₁₄ -C ₂₄ acyllates, such as behenoyllactylates, and in particular sodium behenoyllactylate; And

- C ₆ -C ₂₄ acylglycinates, in particular C ₁₂ -C ₂₀ ;

in particular in the form of alkali or alkaline-earth metal, ammonium or aminoalcohol salts; And

- their mixtures.

The sulphonate anionic surfactants which can be used can therefore comprise at least one sulphonate function.

They can be chosen from the following compounds: alkylsulfonates, alkylamidesulfonates, alkylarylsulfonates, olefinsulfonates, paraffin sulfonates, alkylsulfosuccinates, alkyl ether sulfosuccinates, alkylamidesulfosuccinates, alkylsulfoacetates, N-acyltaurates, acylisethionates; alkylsulfolaurates; as well as the salts of these compounds; the alkyl groups of these compounds comprising from 6 to 30 carbon atoms, in particular from 12 to 28, even better from 14 to 24, or even from 16 to 22 carbon atoms; and the aryl group preferably representing a phenyl group or a benzyl group; these compounds possibly being polyoxyalkylenated, in particular polyoxyethylenated, and preferably comprising from 1 to 50 ethylene oxide units, even better still from 2 to 10 ethylene oxide units.

Preferably, said anionic sulphonate surfactants are chosen from:

- C ₆ -C ₂₄ alkylsulfosuccinates, in particular C ₁₂ -C ₂₀ alkylsulfosuccinates, in particular laurylsulfosuccinates;
- C ₆ -C ₂₄ alkyl ether sulfosuccinates, in particular C ₁₂ -C ₂₀ ;

- C ₆ -C ₂₄ acylisethionates, preferably C ₁₂ -C ₁₈ acylisethionates;

in particular in the form of alkali or alkaline-earth metal, ammonium or aminoalcohol salts; And

- their mixtures.

The sulphate anionic surfactants which can be used can therefore comprise at least one sulphate function.

They can be chosen from the following compounds: alkyl sulphates, alkyl ether sulphates, alkylamido ether sulphates, alkylaryl polyether sulphates, monoglyceride sulphates; as well as the salts of these compounds; the alkyl groups of these compounds comprising from 6 to 30 carbon atoms, in particular from 12 to 28, even better from 14 to 24 or even from 16 to 22 carbon atoms; the aryl group preferably representing a phenyl group or a benzyl group; these compounds possibly being polyoxyalkylenated, in particular polyoxyethylenated, and preferably comprising from 1 to 50 units of ethylene oxide and even better still from 2 to 10 units of ethylene oxide.

Preferably, said sulphate anionic surfactants are chosen from:

- C ₆ -C ₂₄ alkyl sulphates, in particular C ₁₂ -C ₂₀ alkyl sulphates;

- alkyl ether sulfates, in particular C ₆ -C ₂₄ or even C ₁₂ -C ₂₀ , preferably comprising from 2 to 20 ethylene oxide units;

in particular in the form of alkali or alkaline-earth metal, ammonium or aminoalcohol salts; And

- their mixtures.

When the anionic surfactant (ii) is in the form of a salt, this salt can be chosen from alkali metal salts, such as sodium salts or potassium salts, ammonium salts, amine salts and in particular aminoalcohol salts, and alkaline-earth metal salts such as magnesium salts or calcium salts.

As examples of aminoalcohol salts, mention may in particular be made of monoethanolamine, diethanolamine or triethanolamine salts, monoisopropanolamine, diisopropanolamine or triisopropanolamine salts, 2-amino-2-methyl-1- propanol, 2-amino-2-methyl-1,3-propanediol salts and tris(hydroxymethyl)aminomethane salts. Alkali or alkaline-earth metal salts and in particular sodium or magnesium salts are preferably used.

Preferably, said additional anionic surfactants (ii) are chosen from:

- C ₆ -C ₂₄ alkyl sulphates, in particular C ₁₂ -C ₂₀ alkyl sulphates;

- C ₆ -C ₂₄ , in particular C ₁₂ -C ₂₀ , alkyl ether sulphates, preferably comprising from 2 to 20 ethylene oxide units;

- C ₆ -C ₂₄ alkylsulfosuccinates, in particular C ₁₂ -C ₂₀ alkylsulfosuccinates, in particular laurylsulfosuccinates;

- C ₆ -C ₂₄ alkyl ether sulfosuccinates, in particular C ₁₂ -C ₂₀ ;

- C ₆ -C ₂₄ acylisethionates, preferably C ₁₂ -C ₁₈ acylisethionates;

- C ₆ -C ₂₄ acylsarcosinates, in particular C ₁₂ -C ₂₀ ; in particular palmitoylsarcosinates;

- C ₆ -C ₂₄ acylglutamates, in particular C ₁₂ -C ₂₀ ;

- C ₆ -C ₂₄ acylglycinates, in particular C ₁₂ -C ₂₀ ;

in particular in the form of alkali or alkaline-earth metal, ammonium or aminoalcohol salts; And

- their mixtures.

Among the anionic surfactants (ii), one or more sulphate anionic surfactants are particularly preferred. Preferably, the anionic surfactant(s) (ii) are in the form of salts, and in particular alkaline salts, in particular sodium salts, ammonium salts, amine salts, including aminoalcohol salts, and/or magnesium salts. These salts preferably comprise from 2 to 5 ethylene oxide groups.

The anionic surfactants (ii) are preferably chosen from C ₈ -C ₁₄ alkyl sulphates and/or C ₈ -C ₁₄ alkyl ether sulphates, more preferably from C ₁₂ -C ₁₄ alkyl sulphates and/or C ₁₂ -C ₁₄ alkyl ether sulphates, better still lauryl (ether) sulphates.

C ₁₂ -C ₁₄ alkyl sulfates of sodium, triethanolamine, magnesium or ammonium and/or C ₁₂ -C ₁₄ alkyl ether sulfates of sodium, ammonium or magnesium, which are oxyethylenated, for example with 1 to 10 moles of ethylene oxide are more preferably used.

Better still, the anionic surfactant(s) (ii) are chosen from sodium, ammonium or magnesium C ₁₂ -C ₁₄ alkyl ether sulphates, oxyethylenated with 2.2 moles of ethylene oxide, such as those sold for example under the name Texapon N702 by the company Cognis or under the name ZETESOL ^TM 270/N – RSPO-MB by the company ZSCHIMMER & SCHWARZ (sodium laureth sulphate).

The anionic surfactants (ii) distinct from the polyoxyalkylenated alkyl (amido) ether carboxylic acid anionic surfactants (i) may be present in an amount ranging from 0.001% to 20% by weight, preferably ranging from 0.1% to 10% by weight , relative to the total weight of the composition.

(iii) Non-ionic surfactants

A composition suitable for the invention may comprise at least one nonionic surfactant.

The nonionic surfactants (iii) can be chosen from the following compounds:

- (a) oxyethylenated alcohols comprising at least one saturated or unsaturated, linear or branched C ₈ to C ₄₀ alkyl chain, and comprising from 1 to 100 moles of ethylene oxide, preferably from 2 to 50 moles, and more particularly from 2 to 40 moles of ethylene oxide and comprising one or two fatty chains;

- (b) nonionic surfactants of the alkyl(poly)glycoside type, represented in particular by the following general formula:

R1O-(R2O)t-(G)v

in which :

- R1 represents an alkyl or alkenyl radical, linear or branched, comprising from 6 to 24 carbon atoms, and in particular from 8 to 18 carbon atoms, or an alkylphenyl radical whose linear or branched alkyl radical comprises from 6 to 24 carbon atoms. carbon, and in particular from 8 to 18 carbon atoms;

-R2 represents an alkylene radical comprising from 2 to 4 carbon atoms;

- G represents a sugar unit comprising from 5 to 6 carbon atoms;

- t represents a value ranging from 0 to 10, preferably from 0 to 4;

- v represents a value ranging from 1 to 15, preferably from 1 to 4;

- (c) esters of polyethoxylated fatty acids of sorbitan, preferably containing from 2 to 40 moles of ethylene oxide and comprising at least one saturated or unsaturated, linear or branched C ₈ -C ₄₀ alkyl chain, of preferably a C ₁₀ -C ₂₈ alkyl chain (fatty acid);

- (d) sucrose fatty acid esters, preferably comprising at least one saturated or unsaturated, linear or branched C ₈ to C ₄₀ alkyl chain, preferably a C ₁₀ -C ₂₈ alkyl chain (fatty acid ), such as sucrose cocoate and sucrose palmitate;

- (e) polyglycerolated fatty esters, the number of glycerol groups possibly ranging from 2 to 30 and comprising at least one saturated or unsaturated, linear or branched C ₈ to C ₄₀ alkyl chain, preferably a C ₁₀ alkyl chain - C ₂₈ (fatty acid), such as polyglyceryl-5 laurate, polyglyceryl-4 laurate, polyglyceryl-10 laurate, polyglyceryl-6 dicaprate; And

- (f) mixtures thereof.

Preferably, the nonionic surfactants of the alkyl(poly)glycoside type are compounds of formula

R1O-(R2O)t-(G)v

in which :

- R1 represents an alkyl radical, linear or branched, saturated or unsaturated comprising from 8 to 18 carbon atoms;

-R2 represents an alkylene radical comprising from 2 to 4 carbon atoms;

- G represents a glucose, a fructose or a galactose, preferably a glucose;

- t represents a value ranging from 0 to 3, preferably from 0; And

- the degree of polymerization, i.e. the value of v, which can range from 1 to 15 and preferably from 1 to 4; the average degree of polymerization being more particularly between 1 and 2.

The glucosidic bonds between the sugar units are generally of the 1-6 or 1-4 type and preferably of the 1-4 type. Preferably, the alkyl(poly)glycoside surfactant is an alkyl(poly)glucoside surfactant. C ₈ to C ₁₆ type 1-4 alkyl (poly) glucosides, and in particular decyl glucosides and caprylyl/capryl glucosides, are very particularly preferred.

Among the commercial products, mention may be made of the products marketed by the company Cognis under the names Plantaren® (600 CS/U, 1200 and 2000) or Plantacare® (818, 1200 and 2000); the products marketed by the company SEPPIC under the names Oramix® CG 110 and Oramix® NS 10; the products marketed by the company BASF under the name Lutensol® GD 70, or else the products marketed by the company Chem Y under the name AG10 LK.

Preferably, C ₈ to C ₁₆ type 1-4 alkyl(poly)glycosides are used, in particular in the form of a 53% aqueous solution, such as those marketed by Cognis under the reference Plantacare® 818 UP .

According to a preferred embodiment, the nonionic surfactants (iii) can be chosen from the following compounds:

- oxyethylenated fatty alcohols, saturated or unsaturated, linear or branched, C ₈ to C ₄₀ , in particular containing and comprising from 1 to 100 moles of ethylene oxide, preferably from 2 to 50 moles, and more particularly from C ₈ to C ₂₀ , and even better in C ₁₀ to C ₁₈ comprising from 1 to 100 moles of ethylene oxide, preferably from 2 to 50 moles of ethylene oxide, more particularly from 2 to 40 moles of ethylene oxide, or even 3 to 20 moles of ethylene oxide, in particular lauryl alcohol containing 4 moles of ethylene oxide (INCI name: Laureth-4) and lauryl alcohol containing 12 moles of ethylene oxide (INCI name: Laureth-12);

- C ₆ -C ₂₄ alkyl(poly)glycosides, more particularly C ₈ -C ₁₈ alkyl(poly)glycosides _; And

- their mixtures.

According to a more preferred embodiment, the nonionic surfactants (iii) are chosen from oxyethylenated alcohols comprising at least one C ₈ -C ₂₀ and preferably C ₁₀ -C ₁₈ alkyl chain, comprising from 2 to 50 moles of ethylene oxide, in particular from 3 to 20 moles of ethylene oxide.

The nonionic surfactants (iii) may be present in an amount ranging from 0.001% to 20% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition.

(iv) Amphoteric/zwitterionic surfactants

A composition suitable for the invention may comprise at least one amphoteric or zwitterionic surfactant.

The amphoteric/zwitterionic surfactant(s) are non-silicone surfactants. They may in particular be optionally quaternized secondary or tertiary aliphatic amine derivatives, in which the aliphatic group is a linear or branched chain comprising from 8 to 22 carbon atoms, said amine derivatives containing at least one anionic group, for example a carboxylate, sulfonate, sulfate, phosphate or phosphonate.

Mention may in particular be made of C ₈ -C ₂₀ alkylbetaines, C ₈ -C ₂₀ alkylsulfobetaines, (C ₈ -C ₂₀ )alkylamido(C ₃ -C ₈ )alkyl betaines and (C ₈ -C ₂₀ )alkylamido( C ₆ -C ₈ )alkyl-sulfobetaines.

Among the optionally quaternized secondary or tertiary aliphatic amine derivatives which can be used, as defined above. Mention may also be made of the compounds having the formulas (II) and (III) below:

Ra-CONHCH ₂ CH ₂ -N+(Rb)(Rc)-CH ₂ COO-, M ⁺ , X ^- (II)

in which :

- Ra represents a C10 to C30 alkyl or alkenyl group derived from an acid RaCOOH preferably present in hydrolyzed coconut oil, or a heptyl, nonyl or undecyl group;

- Rb represents a beta-hydroxyethyl group;

- Rc represents a carboxymethyl group;

- M ⁺ represents a cationic counter-ion derived from an alkali or alkaline-earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine; And

- X ^- represents an organic or mineral anionic counter-ion such as those chosen from halides, acetates, phosphates, nitrates, C ₁ -C ₄ alkyl sulphates, (C ₁ -C ₄ )alkyl- or (C ₁ -C ₄ )alkylarylsulphonates, in particular methyl sulphate and ethyl sulphate; or alternatively M ⁺ and X ^- are absent;

Ra'-CONHCH ₂ CH ₂ -N(B)(B') (III)

in which:

- B represents the -CH ₂ CH ₂ OX'group;

- B' represents the -(CH ₂ )zY' group, with z = 1 or 2;

- X' represents the group -CH ₂ COOH, -CH ₂ -COOZ', -CH ₂ CH ₂ COOH or -CH ₂ CH ₂ -COOZ', or a hydrogen atom;

- Y' represents the group -COOH, -COOZ' or -CH ₂ -CH(OH)SO ₃ H or the group -CH ₂ CH(OH)SO ₃ -Z'; - Z' represents a cationic counter-ion resulting from an alkaline or alkaline-earth metal, such as sodium, an ammonium ion or an ion resulting from an organic amine; And

- Ra' represents a C ₁₀ to C ₃₀ alkyl or alkenyl group of an acid Ra'-COOH which is preferably present in coconut oil or in hydrolyzed linseed oil, or an alkyl group, in particular a C ₁₇ group, and its iso form, or an unsaturated C ₁₇ group. These compounds are classified in the CTFA Dictionary, 5th Edition, 1993, as disodium cocoamphodiacetate, disodium lauroamphodiacetate, disodium caprylamphodiacetate, disodium capryloamphodiacetate, disodium cocoamphodipropionate, disodium lauroamphodipropionate, disodium caprylamphodipropionate, disodium capryloamphodipropionate, lauroamphodipropionic acid, and cocoamphodipropionic acid.

By way of example, mention may be made of the cocoamphodiacetate marketed by the company Rhodia under the name Miranol® C2M Concentrate.

It is also possible to use compounds of formula (IV):

Ra''-NHCH(Y'')-(CH ₂ ) _n CONH(CH ₂ ) _n '-N(Rd)(Re) (IV)

in which:

- Y'' represents the group -COOH, -COOZ'' or -CH ₂ -CH(OH)SO ₃ H or the group -CH ₂ CH(OH)SO ₃ -Z'';

- Rd and Re represent, independently of one another, a C ₁ to C ₄ alkyl or hydroxyalkyl radical;

- Z'' represents a cationic counter-ion derived from an alkali metal or an alkaline-earth metal such as sodium, an ammonium ion or an ion derived from an organic amine;

- Ra'' represents a C ₁₀ to C ₃₀ alkyl or alkenyl group of an acid Ra''-COOH which is preferably present in coconut oil or in hydrolyzed linseed oil; And

- n and n' represent, independently of each other, an integer ranging from 1 to 3.

Among the compounds of formula (II), mention may be made of the compound classified in the CTFA dictionary, 5th edition, 1993, under the name sodium diethylaminopropyl cocoaspartamide and sold by Chimex under the name Chimexane HB.

These compounds can be used alone or in mixtures.

Among the amphoteric/zwitterionic surfactants, (C ₈ -C ₂₀ )alkylbetaines are preferably used such as cocoylbetaine (also called coco-betaine) in particular that marketed under the name CHEGINA CC-MB by the company PPU CHEMCO, (C ₈ -C ₂₀ )alkylamido(C ₃ -C ₈ )alkylbetaines such as cocamidopropyl betaine, and their mixtures, and the compounds of formula (IV) such as the sodium salt of diethylaminopropyl laurylaminosuccinamate (INCI name: sodium diethylaminopropyl cocoaspartamide).

Preferably, the amphoteric/zwitterionic surfactants are chosen from (C ₈ -C ₂₀ )alkylamido(C ₃ -C ₈ )alkyl betaines such as cocamidopropyl betaine. More preferentially, the amphoteric/zwitterionic surfactants are chosen from (C ₈ -C ₂₀ )alkylbetaines such as coco-betaine.

The amphoteric/zwitterionic surfactants (iv) may be present in an amount ranging from 0.001% to 20% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition.

The foaming surfactants (i), (ii), (iii), and/or (iv) capable of generating and/or stabilizing bubbles as defined in the present invention can be present in an amount ranging from 0.001% to 20% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition.

The nature of the surfactant can influence the mechanical properties of the bubbles and therefore the power needed to collapse them, with smaller bubbles requiring less power.

Independently of the presence of bubbles, the surfactant(s) present in the composition suitable for the invention can also have a cleansing action.

Compounds conventionally present in makeup-removing compositions from which bubbles can be generated or helping to stabilize them

As mentioned above, to generate and/or stabilize the bubbles, a composition suitable for the invention may also comprise at least one compound usually used in makeup-removing compositions such as (a) an alkylpolysaccharide, (b) an ether of fatty alcohol polyethylene glycol, (c) an oil, and mixtures thereof.

a) Alkylpolysaccharides

A composition suitable for the invention may comprise at least one alkylpolysaccharide.

Among the suitable alkylpolysaccharides, mention may in particular be made of those of general formula (I) which follows:

RO(C _x H _2x O)nZy (I)

in which

Z is a group derived from a reducing saccharide containing 5 or 6 carbon atoms or a group from a reducing saccharide containing 5 or 6 carbon atoms,

R is an alkyl group or a C ₆ -C ₃₀ alkene group,

x is 2 or 3,

n is 1 to 10, and

y is 1 to 10, including all values and subranges between them, such as 1.5 to 4.

Alkylpolysaccharides (also known as alkyl polyglycosides), which can be used in cosmetic compositions, include those commercially available, such as APG®, GlucoponTM, or PlantarenTM surfactants marketed by Cognis Corporation, Ambler, PA., 19002 Examples of such surfactants include, but are not limited to:

APG® 225: an alkylpolyglycoside in which the alkyl group contains 8 to 10 carbon atoms.

APG® 425: an alkyl polyglycoside in which the alkyl group contains 8 to 16 carbon atoms.

APG® 625: an alkyl polyglycoside in which the alkyl group contains 12 to 16 carbon atoms.

APG® 300: an alkyl polyglycoside substantially the same as the above product but having a different average degree of polymerization.

GlucoponTM 600: an alkyl polyglycoside substantially the same as the above product but having a different average degree of polymerization.

PlantarenTM 2000: a C ₈ -C ₁₆ alkyl polyglycoside having an average degree of polymerization of 1.4.PlantarenTM 1300: a C ₁₂ -C ₁₆ alkyl polyglycoside having an average degree of polymerization of 1.6.

PlantarenTM 1200: a C ₁₂ -C ₁₆ alkyl polyglycoside having an average degree of polymerization of 1.4.

Other non-limiting examples include surfactant compositions of alkylpolyglycosides such as those sold under the name Triton, Oramix or Montanov by SEPPIC, under the name AG by Kao, under the name Atlas G-73500 by Uniqema, under the name as Marlosan 240 by Condea Chemie or as Desulf GOS-P-60WCG by DeForest Enterprises.

The alkylpolysaccharides (a) may be present in an amount ranging from 0.01% to 20% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition.

b) Fatty alcohol polyethylene glycol ethers

A composition suitable for the invention may comprise at least one fatty alcohol polyethylene glycol ether.

Suitable fatty alcohol polyethylene glycol ethers include polyethylene glycol derivatives of glyceryl cocoate, glyceryl caproate, glyceryl caprylate, glyceryl tallow, glyceryl palmate, glyceryl stearate, glyceryl laurate, glyceryl oleate, glyceryl ricinoleate and glyceryl fatty esters derived from triglycerides, such as palm oil, almond oil, olive oil and corn oil, and mixtures thereof .

These polyethylene glycol ethers of fatty alcohols (b) can be used in an amount ranging from 0.01% to 25% by weight, preferably ranging from 0.1% to 10% by weight, relative to the total weight of the composition, and are preferably surfactants.

c) Oils

A composition suitable for the invention may comprise at least one oil.

Suitable oils include those commonly used in makeup removers. These oils can be chosen from mineral oils, vegetable oils, synthetic oils, silicone oils, and mixtures thereof.

Among the mineral oils which can constitute the oily phase, mention may in particular be made of liquid paraffin or a mineral oil and higher aliphatic hydrocarbons such as, for example, isohexadecane. Vegetable oils include jojoba oil, meadowfoam seed oil, apricot kernel oil and safflower oil. Among the silicone oils, mention may in particular be made of cyclopentadimethylsiloxane marketed under the name "Volatile Silicone7158" by the company Union Carbide or DM-fluid 0.6cs, a linear volatile silicone oil sold by Shin-Etsu or the polydimethylsiloxanes sold under the name of DC200 by Dow Corning.

Among the synthetic products, mention may in particular be made of esters such as alkyl palmitates in which the alkyl radical has from 2 to 10 carbon atoms, such as isopropyl palmitate or 2-ethylhexyl palmitate and adipates of alkyl in which the alkyl radical has 2 to 10 carbon atoms, such as bis(2-ethylhexyl) adipate, or esters such as isononyl isononanoate or derivatives such as meadow moss.

These oils (c) can be used in amounts ranging from 0.1 to 100% by weight, preferably ranging from 0.1% to 60% by weight, relative to the total weight of the composition .

By way of other examples, a compound with a stabilizing action suitable for the invention is preferably chosen from:

- fatty alcohols;

- polyalkylene glycols;

- polyglyceryl fatty acid esters;

- polyalkyleneglycol ethers of alkylglucose;

- cellulose;

- crosslinked polymers formed by the reaction of a C ₁₀ -C ₁₈ alkylglucoside with 1,3-dichloro-2-propanol, and sulphonated with 3-chloro-2-hydroxypropyl sulphonate;

- fatty acid alkanolamides;

- and mixtures thereof.

A) The fatty alcohols are preferably those comprising a linear saturated alkyl chain having from 10 to 18 carbon atoms such as for example lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol and their mixtures such as mixtures of cetyl alcohol and stearyl alcohol (cetearyl alcohol);

B) The polyalkylene glycols are preferably those of formula (II)

H-[O-R-]n-OH(II)

in which

- R represents a linear alkyl chain containing from 1 to 4 carbon atoms, and

- n is an integer ranging from 4 to 100,000, advantageously from 4 to 50,000.

According to a particular embodiment of the invention, a polyalkylene glycol, in accordance with the invention is a polyethylene glycol.

According to a preferred embodiment, a polyethylene glycol, in accordance with the invention can be chosen from PEG-8 such as the product sold under the trade name Polyethylene Glycol 400 DUB® by the company Clariant, PEG-45M such as the product marketed under the trade name POLYOX WSR N 60 K® by the company Dow Chemical.

C) The polyglyceryl fatty acid esters are preferably monoesters of a fatty acid comprising a saturated alkyl chain having from 10 to 18 carbon atoms and of a polyglycerol having from 2 to 30 moles of glycerol groups.

According to a preferred embodiment, a polyglycerolated fatty acid ester in accordance with the invention may be chosen from polyglyceryl-2 laurate, such as the product sold under the trade name SUNSOFT Q-12D-C® by the company TAIYO KAGAKU.

D) Polyalkyleneglycol ethers of alkyl glucose, and preferably polyC ₁ -C ₄ alkylene glycol ethers of C ₁ -C ₄ alkylglucose, in particular methyl gluceth-10 such as the product sold under the trade name GLUCAM E-10 HUMECTANT ® by the company LUBRIZOL and methyl gluceth-20 such as the product sold under the trade name GLUCAM E-20 HUMECTANT® by the company LUBRIZOL.

E) The celluloses are preferably polyalkyleneglycol ethers of alkylcellulose such as hydroxypropyl methylcellulose such as the product marketed under the trade name BENECEL K100M HYDROXYPROPYLMETHYL CELLULOSE® by the company ASHLAND or the product marketed under the name METHOCEL ^TM F4M PERSONAL CARE GRADE by the DOW company.

F) The crosslinked polymers formed by the reaction of a C ₁₀ -C ₁₈ alkylglucoside with 1, 3-dichloro-2-propanol, and sulphonated with 3-chloro-2-hydroxypropyl sulphonate are preferably chosen from polymers having their respective INCI name:

- SODIUM HYDROXYPROPYLSULFONATE LAURYLGLUCOSIDE CROSSPOLYMER sold under the trade name POLYSUGA NATE 160P® by COLONIAL CHEMICAL INC. ;

- SODIUM HYDROXYPROPYLSULFONATE COCOGLUCOSIDE CROSSPOLYMER sold under the trade name POLY SUGANATE 124P® by the company COLONIAL CHEMICAL INC. ; And

- SODIUM HYDROXYPROPYLSULFONATE DECYLGLUCOSIDE CROSSPOLYMER sold under the trade name POLY SUGANATE 100P® by the company COLONIAL CHEMICAL INC.

G) The fatty acid alkanolamides are preferably chosen from C ₁₂ -C ₁₈ fatty acid alkanolamides such as Cocamide MEA or the product sold under the trade name COMPERLAN CMEA® by the company BASF.

Among this list of compounds A) to G) with a stabilizing action suitable for the invention, mention may advantageously be made of polylethylene glycols and polyglycerolated fatty acid esters, and more particularly chosen from PEG-45M and POLYGLYCERYL-2 LAURATE .

Preferably, among this list of compounds A) to G) with a stabilizing action suitable for the invention, celluloses can be used, in particular polyalkylene glycol ethers of alkylcellulose such as hydroxypropyl methylcellulose.

Advantageously, a cosmetic composition suitable for the invention comprises a quantity of compounds with a stabilizing action ranging from 0.001% to 20% by weight, preferably ranging from 0.01% to 10% by weight, relative to the total weight of the composition .

Even more advantageously, when the compound with a stabilizing action is a cellulose, in particular polyalkylene glycol ethers of alkyl cellulose such as hydroxypropyl methylcellulose, this compound may be present in the composition in an amount ranging from 0.05% to 1 % by weight, preferably from 0.1% to 0.9% by weight and more preferably from 0.5% by weight, relative to the total weight of the composition.

According to a particular embodiment, the composition suitable for the invention comprises, as compound with stabilizing action, at least one cellulose, in particular chosen from polyalkylene glycol ethers of alkyl cellulose, preferably hydroxypropyl methylcellulose.

According to another particular embodiment, the composition suitable for the invention comprises, as compound with stabilizing action, at least one anionic surfactant (ii) such as those defined in the present text, in particular chosen from C alkyl ether sulphates ₁₂ -C ₁₄ of sodium, ammonium or magnesium, oxyethylenated with 2.2 moles of ethylene oxide, preferably sodium laureth sulphate.

According to another particular embodiment, the composition suitable for the invention comprises, as compound with stabilizing action, at least one amphoteric/zwitterionic surfactant (iv) such as those defined in the present text, in particular chosen from (C ₈ -C ₂₀ )alkylbetaines, preferably coco-betaine.

CATIONIC FOAMING SURFACTANT

According to one embodiment, the composition according to the invention may comprise at least one cationic surfactant, in particular in the case where it comprises an amphoteric foaming surfactant. The cationic agents used can also have a role of thickener favorable to the stabilization of the bubbles.

The cationic surfactants that can be used according to the present invention are in particular salts of primary, secondary or tertiary fatty amines, optionally polyoxyalkylenated, quaternary ammonium salts, imidazoline derivatives, amine oxides of cationic nature, and mixtures thereof. .

Quaternary ammonium salts are for example:

- those having the following general formula (IV):

in which the radicals R ₁ to R ₄ , which may be identical or different, represent an aliphatic radical, linear or branched, containing from 1 to 30 carbon atoms, or an aromatic radical such as aryl or alkylaryl. The aliphatic radicals can comprise heteroatoms such as in particular oxygen, nitrogen, sulfur, halogens. The aliphatic radicals are for example chosen from alkyl, alkoxy, polyoxyalkylene (C ₂ -C ₆ ), alkylamide, alkyl (C ₁₂ -C ₂₂ ) amido alkyl (C ₂ -C ₆ ), alkyl (C ₁₂ -C ₂₂ )acetate, hydroxyalkyl, having about 1 to 30 carbon atoms; X is an anion chosen from the group of halides, phosphates, acetates, lactates, (C ₂ -C ₆ )alkyl sulphates, alkyl-or-alkylarylsulphonates, Preferably R ₁ and R ₂ denote a C ₁ -C ₄ alkyl, or a C ₁ -C ₄ hydroxyalkyl.

- quaternary ammonium salts of imidazolinium, such as for example that of formula (V) below:

in which R ₅ represents an alkenyl or alkyl radical containing from 8 to 30 carbon atoms, for example derived from coconut fatty acids, R ₆ represents a hydrogen atom, a C ₁ -C ₄ alkyl radical or an alkenyl radical or alkyl containing from 8 to 30 carbon atoms, R ₇ represents a C ₁ -C ₄ alkyl radical, R ₈ represents a hydrogen atom, a C ₁ -C ₄ alkyl radical, X ^- is an anion chosen from the group of halides, phosphates, acetates, lactates, alkyl sulphates, alkyl-or-alkylarylsulphonates. Preferably, R ₅ and R ₆ denote a mixture of alkenyl or alkyl radicals containing from 12 to 21 carbon atoms, for example derived from tallow fatty acids, R ₇ denotes methyl, R ₈ denotes hydrogen.

- quaternary diammonium salts of formula (VI):

in which R ₉ denotes an aliphatic radical comprising approximately 16 to 30 carbon atoms, R ₁₀ , R ₁₁ , R ₁₂ , R ₁₃ and R ₁₄ , which are identical or different, are chosen from hydrogen or an alkyl radical comprising 1 to 4 carbon atoms, and X is an anion chosen from the group of halides, acetates, phosphates, nitrates and methyl sulphates.

- quaternary ammonium salts containing at least one ester function, for example those of formula (VII) below:

in which :

- R ₁₅ is chosen from C ₁ -C ₆ alkyl radicals and C ₁ -C ₆ hydroxyalkyl or dihydroxyalkyl radicals;

- R ₁₆ is chosen from:

- the radical R ₁₉ -C(=O)-,

- linear or branched, saturated or unsaturated C ₁ -C ₂₂ hydrocarbon radicals R ₂₀ ,

- the hydrogen atom,

- R ₁₈ is chosen from:

- the radical R ₂₁ -C(=O)-,

- linear or branched, saturated or unsaturated C ₁ -C ₆ hydrocarbon radicals R ₂₂ ,

- the hydrogen atom,

- R ₁₇ , R ₁₉ and R ₂₁ , identical or different, are chosen from C ₇ -C ₂₁ hydrocarbon radicals, linear or branched, saturated or unsaturated;

- n, p and r, identical or different, are integers ranging from 2 to 6;

- y is an integer from 1 to 10;

- x and z, identical or different, are integers ranging from 0 to 10; And

- X ^- is a simple or complex, organic or inorganic anion;

provided that the sum x + y + z is from 1 to 15, that when x is 0 then R16 denotes R ₂₀ and that when z is 0 then R ₁₈ denotes R ₂₂ .

The alkyl radicals R ₁₅ can be linear or branched and more particularly linear.

Preferably R ₁₅ denotes a methyl, ethyl, hydroxyethyl or dihydroxypropyl radical and more particularly a methyl or ethyl radical.

Advantageously, the sum x + y + z is from 1 to 10.

When R ₁₆ is a hydrocarbon radical R ₂₀ , it can be long and have 12 to 22 carbon atoms or short and have 1 to 3 carbon atoms.

When R ₁₈ is a hydrocarbon radical R ₂₂ , it preferably has 1 to 3 carbon atoms.

Advantageously, R ₁₇ , R ₁₉ and R ₂₁ , which are identical or different, are chosen from C ₁₁ -C ₂₁ hydrocarbon radicals, linear or branched, saturated or unsaturated, and more particularly from C ₁₁ -C alkyl and alkenyl radicals. ₂₁ , linear or branched, saturated or unsaturated.

Preferably, x and z, identical or different, are worth 0 or 1.

Advantageously, y is equal to 1.

Preferably, n, p and r, which are identical or different, are equal to 2 or 3 and even more particularly are equal to 2.

The anion is preferably a halide (chloride, bromide or iodide) or an alkyl sulphate, more particularly methyl sulphate. It is however possible to use methanesulfonate, phosphate, nitrate, tosylate, an anion derived from an organic acid such as acetate or lactate or any other anion compatible with ammonium with an ester function.

The anion X ⁻ is even more particularly chloride or methyl sulfate.

The ammonium salts of formula (VII) in which:

- R ₁₅ denotes a methyl or ethyl radical,

- x and y are equal to 1;

- z is equal to 0 or 1;

- n, p and r are equal to 2;

- R ₁₆ is chosen from:

- the radical R ₁₉ -C(=O)-,

- methyl, ethyl or C ₁₄ -C ₂₂ hydrocarbon radicals

- the hydrogen atom;

- R ₁₈ is chosen from:

- the radical R ₂₁ -C(=O)-,

- the hydrogen atom;

R ₁₇ , R ₁₉ and R ₂₁ , which are identical or different, are chosen from C ₁₃ -C ₁₇ hydrocarbon radicals, linear or branched, saturated or unsaturated and preferably from C ₁₃ -C ₁₇ alkyl and alkenyl radicals, linear or branched, saturated or unsaturated.

Advantageously, the hydrocarbon radicals are linear.

Among the quaternary ammonium salts of formula (IV), preference is given, on the one hand, to tetraalkylammonium chlorides such as, for example, dialkyldimethylammonium or alkyltrimethylammonium chlorides, in which the alkyl radical contains approximately 12 to 22 carbon atoms , in particular behenyltrimethylammonium, distearyldimethylammonium, cetyltrimethylammonium, benzyldimethylstearylammonium chloride or, on the other hand, palmitylamidopropyltrimethylammonium chloride or stearamidopropyldimethyl (myristyl acetate) ammonium chloride marketed under the name " CERAPHYL® 70 " by the VAN DYK company.

Mention may be made, for example, of the compounds of formula (V) such as the salts (chloride or methyl sulphate in particular) of diacyloxyethyl dimethyl ammonium, diacyloxyethyl hydroxyethyl methyl ammonium, monoacyloxyethyl dihydroxyethyl methyl ammonium, triacyloxyethyl methyl ammonium, monoacyloxyethyl hydroxyethyl dimethyl ammonium and their mixtures. The acyl radicals preferably have 14 to 18 carbon atoms and come more particularly from a vegetable oil such as palm or sunflower oil. When the compound contains several acyl radicals, the latter may be identical or different.

These products are obtained for example by direct esterification of triethanolamine, triisopropanolamine, alkyldiethanolamine or optionally oxyalkylenated alkyldiisopropanolamine on fatty acids or on mixtures of fatty acids of vegetable or animal origin or by transesterification of their esters methyl. This esterification is followed by quaternization using an alkylating agent such as an alkyl halide (preferably methyl or ethyl), a dialkyl sulfate (preferably methyl or ethyl), methyl methanesulfonate, methyl paratoluenesulfonate, glycol or glycerol chlorohydrin.

Such compounds are for example marketed under the names DEHYQUART® by the company COGNIS, STEPANQUAT® by the company STEPAN, NOXAMIUM by the company CECA, REWOQUAT® WE 18 and REWOQUAT® W75 by the company DEGUSSA.

It is also possible to use the ammonium salts containing at least one ester function described in patents US-A-4874554 and US-A-4137180.

Quaternary diammonium salts of formula (VI) suitable for the invention include in particular propanetallow diammonium dichloride.

The cationic surfactants are generally present in the composition according to the invention in an amount ranging from 0.01% to 10% by weight, preferably ranging from 0.1% to 1% by weight, relative to the total weight of the composition. .

SOAP

According to another particular embodiment, the composition suitable for the invention comprises at least one soap.

The soap used in the context of the present invention is an organic fatty acid soap with 10 to 22 carbon atoms, more preferably 12 to 18 carbon atoms.

The fatty acid suitable for the present invention can be chosen from linear fatty acids, branched fatty acids and mixtures thereof.

The fatty acid can in particular be chosen from caproic acid, capric acid, caprylic acid, oleic acid, linoleic acid, lauric acid, myristic acid, stearic acid, palmitic acid and mixtures thereof.

Preferably, the fatty acid is a linear fatty acid.

According to a preferred embodiment, the fatty acid can be chosen from lauric acid, myristic acid, stearic acid and their mixtures.

A neutralizing agent can be added to neutralize the soap.

The neutralizing agent can be chosen from amino alcohols such as ethanolamine, amino sugars, amino acids and their alkaline salts. The most preferred neutralizing agent is triethanolamine.

Soap neutralization can be achieved by having a neutralizing agent to fatty acid molar ratio of at least 1:1.43, preferably at least 1:1.25.

According to another embodiment, the molar ratio between neutralizing agent and fatty acid ranges from 1: 1.43 to 1: 1, in particular from 1: 1.25 to 1: 1.05.

The amount to be taken into account for the calculation of the amount of soap is the total fatty acid content without the neutralizing agent.

Thus, the soap content in the composition can for example range from 5% to 50% by weight, more preferably from 10% to 35% by weight and most preferably from 15% to 25% by weight, with respect to the total weight of the composition.

In the present invention, the weight ratio of fatty acid(s) to surfactant(s) may range from 1.5:1.0 to 5.0:1.0, preferably 1.6:1.0 to 4.5:1.0, more preferably from 1.7:1.0 to 4.0:1.0.

According to a preferred embodiment, the weight ratio of the linear fatty acid(s) to the surfactant(s) can range from 1.5: 1.0 to 5.0: 1.0, preferably from 1.6: 1.0 to 4.5:1.0, more preferably 1.7:1.0 to 4.0:1.0.

Advantageously, the presence of both soap and surfactant(s) gives a balance between an open foam with large bubbles and a creamier foam, in addition to a quick rinsing and a feeling of cleanliness after applying the composition.

ADDITIVES

A composition suitable for the invention may also comprise a wide variety of additives usually considered in the field of the galenic formulation of cosmetic compositions, in particular cleaning compositions or compositions for removing make-up from human keratin materials.

Thus, the compositions suitable for the invention may also comprise, as additives, in particular gelling agents, conventional hydrophilic or lipophilic thickening agents, hydrophilic or lipophilic active agents, preservatives (e.g. phenoxyethanol), antioxidants, perfumes, essential oils, emulsifiers, moisturizing agents, chelating agents, sequestering agents (e.g. EDTA and its salts), vitamins, emollients, polymers other than those mentioned above, conditioning agents, humectants, proteins, polypeptides, amino acids and their derivatives, buffering agents, viscosity control agents, plant or plant extracts. Certain powders or particulate compounds can contribute to the stability of bubbles in the medium by being present at the gas/liquid interface, in particular when these powders or particulate compounds are generated from solid constituents which gradually dissolve in the medium.

The additives are generally present in the composition according to the invention in an amount ranging from 0% to 20% by weight, preferably ranging from 0.01% to 10% by weight, relative to the total weight of the composition

These additives and their amounts must be such that they do not modify the property or properties sought for the composition of the invention.

According to one variant, a composition suitable for the invention may comprise an aqueous medium or aqueous phase, that is to say a medium comprising a quantity of water ranging from 0.1% to 99% by weight, preferably ranging from 50% to 90% by weight, and better still ranging from 60% to 90% by weight, relative to the total weight of the composition.

The aqueous phase of the compositions according to the invention may contain, in addition to water, one or more solvents chosen from mono-alcohols comprising from 1 to 6 carbon atoms, polyols and mixtures thereof.

Mention may in particular be made, as mono-alcohols, of ethanol.

When the mono-alcohols are present, their quantity within the composition can vary, for example, 0.1% to 50% by weight, preferably from 0.5% to 15% by weight and better still from 5% to 15 % by weight relative to the total weight of the composition.

By “polyol”, it is necessary to understand, within the meaning of the present invention, any organic molecule comprising at least two free hydroxyl groups.

As polyols, mention may in particular be made of glycerol; glycols such as butylene glycol, isoprene glycol, propylene glycol; sorbitol; sugars such as glucose, fructose, maltose, lactose, sucrose; and their mixtures.

When the polyols are present, their quantity within the composition can vary, for example, 0.1% to 40% by weight, preferably from 0.5% to 15% by weight and better still from 5% to 15% by weight. weight, relative to the total weight of the composition.

According to another variant, a composition suitable for the invention can also be anhydrous.

By “anhydrous”, within the meaning of the present invention, is meant a composition comprising a content of less than or equal to 1% by weight of water, preferably less than or equal to 0.5% by weight relative to the total weight of said composition, even free of water. Where appropriate, such small amounts of water can in particular be supplied by ingredients of the composition which can contain residual amounts thereof.

According to yet another variant, a composition suitable for the invention can also be essentially oily, that is to say comprise an oily phase or fatty phase, that is to say a medium comprising an amount of oil ( s) ranging from 0.1% to 99% by weight, preferably ranging from 50% to 90% by weight, and better still ranging from 60% to 90% by weight, relative to the total weight of the composition.

The person skilled in the art will take care to choose the ingredients entering into the composition, as well as their quantities, so that they do not harm the desired properties of the compositions of the present invention.

The pH of the composition, if it is aqueous, can be between 4 and 7.5, in particular between 4.5 and 6, or can be 10, as is the case for certain foaming products such as soaps.

The cosmetic composition suitable for the invention can be rinsed out or left on after having been applied to the keratin materials and having been subjected to acoustic waves.

A composition suitable for the invention can be prepared according to techniques well known to those skilled in the art.

A composition according to the invention may be in any dosage form conventionally used according to the applications envisaged, and in particular in the form of an aqueous, alcoholic or aqueous-alcoholic, or oily solution or suspension, of a solution or of a dispersion of the type lotion or serum, an oil-in-water or water-in-oil emulsion, a microemulsion, an aqueous or anhydrous gel, or any other suitable cosmetic form.

The cosmetic composition according to the invention finds in particular a particularly advantageous application in the field of body and/or hair hygiene, in particular for cleaning the hair and/or the scalp, as well as for cleaning and/or removing make-up from the skin of the body and/or face. It can thus constitute a shampoo or a shower gel, or even a rinse-off mask.

The expressions “between … and …” and “ranging from … to …” must be understood as limits included, unless the contrary is specified.

In the description and the examples, the percentages are percentages by weight. The ingredients are mixed, in the order and under conditions easily determined by those skilled in the art.

The invention may be better understood on reading the detailed description which follows, non-limiting examples of implementation thereof, and on examining the appended drawing, in which:

schematically illustrates the use of an example of a processing device according to the invention,

is a schematic view, in longitudinal section, of another example of a processing device for implementing the invention,

is a view analogous to of a variant implementation of the invention,

schematically represents various components of the device of the , And

schematically represents a variant embodiment.

detailed description

The process according to the invention comprises the exposure of bubbles present within a cosmetic composition to acoustic waves.

It has been illustrated at a first example of implementation of the invention, in which a cosmetic composition C containing bubbles is present on the surface of the keratin materials K to be treated, and a treatment device 1 is brought into contact with the composition C to emit at the within it acoustic waves.

Composition C is for example in the form of a mousse.

The keratin materials K are for example constituted by the skin of the face or the hair.

This involves, for example, cleaning the skin to remove traces of make-up more quickly and effectively.

The treatment device 1 comprises a handpiece which carries a sonotrode 10, in contact with the composition, and from which the acoustic waves are emitted.

The handpiece can be manipulated in such a way as to provide a slight clearance with the keratin materials K and to avoid contact of the sonotrode with them.

As a variant, the handpiece is arranged to maintain such a gap, thanks to one or more elements intended to contact the keratin materials and set back from which the sonotrode 10 is located.

Under the effect of the acoustic waves, the bubbles undergo a collapse on themselves which generates a shock wave, which is effective in cleaning the skin.

Examples

Example 1

Tests on artificial skin

The composition is for example one of the compositions C1 to C12 mentioned below.

Samples of artificial skin (BIOSKIN brand) are prepared on which a tenacious foundation is applied to a thickness greater than 20 microns.

Leave to dry for 15 minutes at room temperature, and complete drying for 2 minutes with a hair dryer.

A sonotrode is used emitting acoustic waves at a frequency of approximately 35 kHz, which is held approximately 2 to 3 mm from the skin, in contact with the composition.

The sonotrode is moved slowly in contact with the composition (within the foam), without touching the foundation film.

A strong removal of the foundation is observed in the regions where the sonotrode passes while being active, and no removal in the regions where it passes while being switched off.

There is also great difficulty in removing makeup simply by passing a sponge or a brush over it, which demonstrates the cleaning effect obtained in the invention.

Example 2

Tests on natural skin explants

Similar tests are carried out on skin explants, and the removal of the foundation is observed after one or even two passes.

The composition tested is for example the same as that of Example 1, except for a dilution factor.

Attempts to remove traces of indelible marker are also carried out, and the virtual disappearance of the traces is observed after two passages.

Compositions tested

Compositions C1 to C12 in the form of a foaming solution are prepared by mixing the compounds described in Tables 1, 2, 3 and 4 below.

The compositions are prepared from the weight proportions described below. The percentages are by weight relative to the total weight of the composition. The percentage of active ingredients (M.A) is also specified when necessary.

Compounds C1 C2 C3 C4 COCO-BETAINE
(CHEGINA CC-MB marketed by PPU CHEMCO) 43.30%
(13.00% AM) 43.30%
(13.00% AM) 43.30%
(13.00% AM) 43.30%
(13.00% AM) HYDROXYPROPRYLMETHYLCELLULOSE
(METHOCEL ^TM F4M PERSONAL CARE GRADE marketed by DOW) - 0.10% 0.20% 0.30% Water 56.70% 56.60% 56.50% 56.40%

Compounds C5 C6 COCO-BETAINE
(CHEGINA CC-MB marketed by PPU CHEMCO) 43.30%
(13.00% AM) 43.30%
(13.00% AM) HYDROXYPROPRYLMETHYLCELLULOSE
(METHOCEL ^TM F4M PERSONAL CARE GRADE marketed by DOW) 0.40% 0.50% Water 56.30% 56.20%

Compounds C7 C8 C9 C10 SODIUM LAURETH SULFATE
(ZETESOL ^TM 270/N – RSPO-MB marketed by the company ZSCHIMMER & SCHWARZ) 18.57%
(13.00% AM) 18.57%
(13.00% AM) 18.57%
(13.00% AM) 18.57%
(13.00% AM) HYDROXYPROPRYLMETHYLCELLULOSE
(METHOCEL ^TM F4M PERSONAL CARE GRADE marketed by DOW) - 0.10% 0.20% 0.30% Water 81.43% 81.33% 81.23% 81.13%

Compounds C11 C12 SODIUM LAURETH SULFATE
(ZETESOL ^TM 270/N – RSPO-MB marketed by the company ZSCHIMMER & SCHWARZ) 18.57%
(13.00% AM) 18.57%
(13.00% AM) HYDROXYPROPRYLMETHYLCELLULOSE
(METHOCEL ^TM F4M PERSONAL CARE GRADE marketed by DOW) 0.40% 0.50% Water 81.03% 80.93%

The following bubble sizes are measured as summarized in Table 5 below:

The compositions in which the hydroxypropylmethyl cellulose polymer is present in an amount of 0.3% to 0.5% by weight, relative to the total weight of the composition, are those which present the smallest bubbles, and which tend to be the most effective.

Example 3

Hair tests

Hair samples are prepared, namely:

An untreated wick serving as a reference;

a lock of the same hair colored with the “Colorista Washout L’OREAL PARIS” product;

a lock of the same hair colored with the “Majirouge 6.66 L’OREAL PRO” colour.

Ten passages are carried out with a sonotrode emitting at 34 kHz, on each of the wicks.

It can be seen that the reference lock substantially retains its color despite the treatment.

The process produces a significant lightening of the locks colored with the "Colorista Washout" composition, with a delta E of the order of 9, and a lesser discoloration, but which remains visible, of the locks treated with the "Majirouge" composition, with a delta E of the order of 4.

In the example of the , composition C is for example applied from a pressurized container, which generates a foam, then the handpiece carrying the sonotrode is brought into contact with it.

The composition can still be applied, as shown in the , by the device that generates the acoustic waves.

In this figure, the device 1 comprises an applicator 10 arranged to distribute the composition C on the area to be treated, for example through at least one orifice 11.

The device 1 may comprise, as shown, a chamber 12 in which the composition C circulates and at least one ultrasonic transducer 13 for emitting acoustic waves in the chamber 12. The transducer 13 is powered by a generator 15, which may or may not be part of the handpiece, being for example present within a base station to which the handpiece is connected by a cable.

The composition C can be brought into the chamber 12 by a conduit 16, and come for example from a reservoir of composition.

The device 1 comprises a bubble generator 17 to generate gas bubbles within the composition which will be subjected to the acoustic waves emitted by the transducer 13.

This bubble generator 17 is represented only schematically on the because it can have very diverse embodiments, implementing electrolysis or other phenomena.

Alternatively, the bubbles are generated in the tank.

The bubbles are generated at a sufficiently short distance from the outlet 11 so as to come close to or in contact with the area to be treated.

Composition C may contain any compound, as detailed above, allowing the bubbles to be generated and to exist within the composition for a sufficient time for their transport to the area to be treated.

In the example of the , the handpiece is moved along the area to be treated and the composition which is delivered by the outlet 11 is not recycled.

In the variant of , the composition is recycled.

In this example of the , the device 1 used to implement the method according to the invention comprises at least one transducer 13 emitting in a chamber 12 acoustic waves, as in the example of the .

However, the composition C which is distributed by the outlet 11 on the zone K to be treated is recovered by at least one pipe 18 with a view to being recycled.

In the example considered, this conduit 18 opens around the outlet 11 so as to recover the composition which has been in contact with the area to be treated.

The device 1 may comprise, if necessary, around the duct 18 a sealing element 19 such as a flexible lip to contain the composition and facilitate its return through the duct 18.

The conduit 18 communicates with a suction pump 20 which can, as illustrated, send the composition discharged into a filter 21. The latter can be arranged to stop, for example, the particles in suspension in the composition, such as skin debris eliminated during the cleaning for example.

The composition is sent back out of the filter 21 into the chamber.

The composition can come from a reservoir 22 represented schematically, for example carried by the handpiece.

This tank makes it possible to fill the circuit in which the composition circulates during the operation of the device, and to compensate for any losses in composition, in the event of non-recycling of part of it.

The filter 21 can be carried by the reservoir, for example so as to allow its automatic replacement when the composition is exhausted and the reservoir is replaced.

As illustrated on the , the device 1 may comprise an electronic circuit controlling the operation of the transducer(s) 13, comprising a control unit 30, for example with a microcontroller, carried by the handpiece and/or distributed between a possible base station and the workpiece. hand, or present on the base station only.

This control unit 30 can communicate with a man-machine interface 31, which can comprise a screen and/or control buttons, or even communicate by a wireless link with a terminal such as a mobile telephone.

The interface 31 can make it possible to adjust, for example, certain operating parameters of the device, for example the intensity with which the acoustic waves are emitted and/or the bubbles generated.

The electronic circuit can control the operation of the pump 20, the generator 15 supplying the transducer(s) 13, the bubble generator 17 and receive data from one or more sensors 35 such as a part application sensor. hand on the skin. In the latter case, the control unit can start the pump 20, the emission of acoustic waves and the generation of bubbles only when the area to be treated is in place in front of the outlet 11 in a way that will allow the recycling of the composition.

Of course, the invention is not limited to the examples which have just been described.

For example, the device may comprise, as illustrated in , an outlet 11 for delivering the composition laden with bubbles and a transducer 13 arranged offset from the outlet 11. In this case, the composition deposited on the zone to be treated K, laden with bubbles, passes after movement of the part hand relative to the area to be treated, under the transducer 13 where it is exposed to acoustic waves.

A spacing element 19, such as a flexible lip, can be used to separate the transducer 13 from the area to be treated to avoid direct contact with the skin, for example.

Claims (11)

Process for cleaning external human keratin materials in contact with a cosmetic composition within which bubbles of a gas are present and/or are generated, the process comprising the step consisting in subjecting bubbles of the gas, present within of the cosmetic composition (C) in the vicinity of the surface of said materials to be cleaned, to acoustic waves to cause their collapse and generate a mechanical shock on the surface to be cleaned to remove the dirt therefrom. Process according to Claim 1, the composition having a total content of active ingredient(s) of at least 0.02% by mass relative to the total weight of the composition. Method according to one of Claims 1 and 2, the frequency of the acoustic waves ranging from 0.3 kHz to 5 MHz, better still from 10 kHz to 1 MHz, the power of the acoustic waves ranging from 30 mW to 100 W/cm ² , better still 0.1 to 10 W/ ^cm2 Process according to any one of the preceding claims, comprising an abrasion of the keratin materials using abrasive particles. Process according to any one of the preceding claims, the cosmetic composition sent into contact with the keratin materials being at least partially recovered and recycled. Method according to any one of the preceding claims, the cosmetic composition being applied in a first step, with bubbles within it, then exposed in a second step, after its application, to acoustic waves to cause shock waves following the collapsing bubbles. Process according to any one of Claims 1 to 5, the cosmetic composition being applied continuously. Method according to any one of the preceding claims, the area treated being an area of skin, in particular coated with a make-up product. Process according to any one of Claims 1 to 7, the area treated being an area of hair, in particular colored hair, the top of the nails, or the scalp. Kit for implementing the method according to any one of the preceding claims, comprising:

• the cosmetic composition (C) in which the bubbles are generated,
• a device (10) for exposing the bubbles to acoustic waves in the vicinity of the surface to be treated.

Process according to any one of Claims 1 to 9 or kit according to Claim 10, in which the cosmetic composition comprises at least one foaming surfactant chosen from (i) polyoxyalkylenated alkyl (amido) carboxylic acid anionic surfactants, (ii) anionic surfactants distinct from anionic surfactants (i), (iii) non-ionic surfactants, (iv) amphoteric/zwitterionic surfactants, and mixtures thereof and/or at least one compound chosen from (a) an alkylpolysaccharide, (b) a fatty alcohol polyethylene glycol ether, (c) an oil, and mixtures thereof.