CN116745004A

CN116745004A - Method for cleaning human keratin materials, device and kit for carrying out said method

Info

Publication number: CN116745004A
Application number: CN202180091922.6A
Authority: CN
Inventors: D·波尔多; L·德斯福格斯
Original assignee: LOreal SA
Current assignee: LOreal SA
Priority date: 2020-11-26
Filing date: 2021-11-24
Publication date: 2023-09-12
Also published as: FR3116450A1

Abstract

A method for cleaning external human keratin materials in contact with a cosmetic composition in which gas bubbles are present and/or generated, comprising the steps of: subjecting gas bubbles present in the cosmetic composition in the surface area of the material to be cleaned to sound waves so as to break the gas bubbles and create a mechanical impact on the surface to be cleaned to remove dirt therefrom.

Description

Method for cleaning human keratin materials, device and kit for carrying out said method

Technical Field

The present invention relates to cleaning human keratin materials.

Background

Patent application JP 2007-311756 describes an ultrasonic cleaning device for cleaning a silicon wafer, a mask substrate, or the like. The device comprises an ultrasonic transducer mounted in a nozzle through which cleaning liquid flows, and means for introducing a gas to create bubbles in the cleaning liquid.

Patent application US2012/0227761 describes a device for cleaning a surface, which device firstly comprises a chamber that is supplied with liquid and communicates with an outlet pipe that is present on the surface to be cleaned, an ultrasonic transducer that transmits acoustic energy to the liquid contained in the chamber, and the outlet pipe, and secondly a bubble generator for generating gas bubbles in the outlet pipe. The bubble generator may be an electrochemical generator containing a liquid such as a salt (e.g. potassium chloride) to make the liquid conductive. Surfactants may be added to prevent coalescence of the bubbles during their path in the outlet pipe towards the surface to be treated and to ensure that they have the required size when they reach the surface to be treated.

It is envisaged to apply the device for cleaning the skin, especially the skin under the nails of the surgeon and also the hands.

Said patent application mentions that surfactants can be added to influence the size of the bubbles produced.

Cosmetic applications for treating facial skin or hair are not disclosed.

Patent applications US2017/0080257, KR 2020/0102956, US2009/318853, JP 2016/214424 and WO 2020/029429 disclose cosmetic methods for treating skin, in particular for cleansing skin, using an ultrasound device generating microbubbles in a cosmetic composition applied to the skin to be cleaned.

Similar devices are disclosed in patent applications US2011/213281 and US 2010/010420.

These devices use a large amount of water and fresh composition at each use, all discarded.

Ecological design of products by promoting sustainable utilization of resources has become a critical factor in minimizing the environmental impact of the products. Manufacturers are responsible and encouraged by consumer changes to ecologically design their formulas and packaging while taking care to optimize industrial processes and manage production waste. This establishes a virtuous circle. Also, this global personal liability exercise is involved as consumers become more throttled. Thus, products with reduced environmental footprints may meet the increasingly realistic expectations of consumers.

Disclosure of Invention

The present invention aims to propose a method for cleaning human keratin materials, in particular facial skin or hair, so that said materials can be effectively cleaned and fall within a responsible sustainable development process by reducing the carbon footprint.

Summary of the invention

Accordingly, one subject of the present invention is a method for cleaning external human keratin materials in contact with a cosmetic composition in which gas bubbles are present and/or generated, comprising the following steps: subjecting gas bubbles present in the cosmetic composition in the surface area of the material to be cleaned to sound waves so as to break the gas bubbles and create a mechanical impact on the surface to be cleaned to remove dirt therefrom.

The method is preferably cosmetic and in particular non-therapeutic.

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

One subject of the present invention is also a device for cleaning external human keratin materials, comprising an applicator arranged to dispense, via at least one outlet, a cosmetic composition onto an area to be treated, a chamber in which the composition circulates, and at least one ultrasonic transducer to emit sound waves inside the chamber, said transducer being powered by a current generator, and a bubble generator to generate gas bubbles within the composition to be subjected to the sound waves emitted by the transducer; the device further comprises a system for at least partially recovering and recycling the cosmetic composition in contact with the keratin materials.

The cosmetic composition can be reused after passing through the recovery and recycling system.

Preferably, the device is a cosmetic device, in particular for non-therapeutic purposes, and better still for topical application of a cosmetic composition.

The term "cosmetic composition" means a composition containing at least one cosmetically active agent (as defined in Cosmetics Directive/768/EEC).

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

The term "external human keratin material" means the skin and its coverings, in particular the hair and nails, and excludes mucous membranes, such as gums. The skin area treated according to the present invention may be the skin of the face, neck lines, back, arms, legs, hands and/or feet, as well as the scalp. The method according to the invention is most particularly suitable for removing cosmetics from facial skin and/or cleansing facial skin, especially the forehead, cheeks, chin, nose and scalp.

Among the unwanted dirt that may be present on keratin materials (anchored at the surface and/or deeper into the skin pores), it is possible to distinguish between exogenous impurities (e.g. cosmetics, environmental pollution, dust, microorganisms, etc.), and endogenous impurities or imperfections (e.g. superfluous sebum, sweat, dead cells, dead skin, dandruff, blackheads, shallow scars and/or acne scars, pigment spots, etc.).

The method or apparatus according to the present invention makes it possible to effectively remove or treat both exogenous impurities and endogenous impurities or defects. Under the action of sound waves, the bubbles generate shock waves, and can generate mechanical action on the keratin materials. They may also assist in releasing chemicals, such as free radicals, that assist in cleaning the keratin materials.

The term "in the surface area of the material to be cleaned" is understood to mean that the bubbles are sufficiently close for their effect of breaking down under the action of sound waves to have a beneficial effect on the cleaning action. For example, the bubbles are present at less than 5mm, more preferably less than 2mm and even more preferably less than 1mm from the surface to be cleaned.

According to the invention, the composition advantageously has a total content of one or more cleaning actives of at least 0.02% by mass relative to the total weight of the composition. The total content of the one or more cleaning actives is at least 0.02 mass%, still better at least 0.05% and even better at least 0.1% relative to the total weight of the composition; thus, the composition may also have a cleaning effect in the absence of bubbles broken by sound waves. The content may be less than or equal to 20 wt%.

The cleansing active may assist in the formation of air bubbles and/or stabilization thereof, such cleansing actives being selected, for example, from the compounds detailed below, especially from the foaming surfactants such as polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactants, anionic surfactants other than the polyoxyalkylene alkyl (amido) ether carboxylic acids described above, nonionic surfactants, amphoteric and zwitterionic surfactants and mixtures thereof, and/or from the compounds conventionally present in make-up removal compositions such as alkyl polysaccharides, fatty alcohol polyethylene glycols, oils and mixtures thereof.

Acoustic wave

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

The frequency range of the acoustic wave is, for example, 3kHz to 5Mhz, more preferably 3kHz to 1Mhz, even more preferably 10kHz to 1Mhz, especially 10kHz to 500kHz.

The power of the sound wave ranges, for example, from 30mW to 100W/cm ² (in the case of high power, the duration is short enough to avoid damage to the keratin material, for example less than or equal to 1 s), preferably 0.1 to 10W/cm ² Or even 1 to 7W/cm ² 。

The acoustic wave may be generated by a single transducer or, as a variant, by at least two transducers. Each transducer may include an ultrasonic generator (sonotrode), typically made of metal, which may define a surface through which sound waves are emitted. Such an ultrasonic generator may be made of metal, for example. The transducer may comprise at least one piezoelectric material.

The acoustic waves may be generated at all times once the treatment device is turned on, or alternatively may be generated only when certain operating conditions are met, such as the presence of a composition in contact with one or more transducers and/or the presence of a device in contact with the area to be treated and/or whether the device detects fouling of the area.

The acoustic wave may be generated by a sinusoidal signal or a signal having a more complex shape (e.g. with frequency modulation or with amplitude modulation). The sound waves are preferably emitted at a single frequency, which may enable them to be focused more precisely on a given area, but may, as a variant, be emitted at several different frequencies. The acoustic waves may be emitted continuously or in pulses.

Thus, the method may comprise the step of detecting the presence of the cosmetic composition in contact with one or more transducers and adjusting the function of the one or more transducers in dependence on the detection.

Similarly, the device may include a system for detecting the presence of the cosmetic composition in contact with one or more transducers, and adjusting the function of the one or more transducers based on the detection.

The method may further comprise the step of detecting the presence of a device in contact with the area to be treated and adjusting the function of the one or more transducers in dependence of the detection.

Similarly, the apparatus may comprise a system for detecting the presence of an apparatus in contact with the area to be treated and adjusting the function of one or more transducers in dependence on the detection.

Thus, the emission of sound waves in the absence of the composition or when the device is not in the condition of treating keratin materials is avoided.

Preferably, the sound waves are emitted without the transducer or associated ultrasonic generator being in contact with the area to be treated. Thus, the acoustic energy emitted in the keratin materials is limited.

The composition may be circulated continuously in contact with one or more transducers, with continuous operation of one or more transducers, or, as a variant, with pulsed operation of one or more transducers. The composition may also be supplied in pulses. The supply of the region subjected to the acoustic wave is advantageously discontinuous, for example by supplying the period of the region while no acoustic wave is generated, and then subjecting the composition present in the region to the period of the acoustic wave without being updated during this exposure. This makes it possible to prevent bubbles present in the composition from being repelled by sound waves present in the composition before entering the region.

Thus, the function of the supply of the composition to one or more transducers may be servo controlled to generate sound waves, or vice versa, and the supply of the one or more transducers and/or the composition may be pulsed. In other words, the supply of the composition may be performed with respect to a time offset with respect to the time at which the acoustic wave is emitted into the region to which the composition is supplied.

The presence of a liquid in the composition may promote the propagation of sound waves. Thus, the gas/liquid mass ratio in the composition may benefit from not being too high, and the composition may advantageously contain a thickener, as described in detail below, or any other compound for increasing the time stability of the gas bubbles.

The transducer or transducers used to generate the acoustic waves may have a region of contact with the composition ranging, for example, from the area of a 5mm diameter circle to the area of a 100mm diameter circle, more preferably from the area of a 5mm diameter circle to the area of a 50mm circle, or even more preferably from the area of a 5mm diameter circle to the area of a 40mm circle.

The acoustic wave generator may take any form suitable for the surface to be treated, where appropriate.

If desired, the distance between the transducer or transducers for generating the acoustic waves and the area to be treated may substantially correspond to the diameter of the gas bubble, and is preferably in the range of 100 μm to 40mm, more preferably in the range of 100 μm to 10 mm.

Gas bubbles

The gas bubbles can be air, CO ₂ Bubbles of oxygen, hydrogen, nitrogen, or the like, and bubbles of a mixture of these gases.

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

The gas may originate from decomposition of the composition or may be extracted from the composition or, as a variant, may be introduced into the composition.

The diameter of the bubbles may be in the range of 100nm to 700. Mu.m, more preferably in the range of 500nm to 50. Mu.m. The size herein means the number average size D of half the population ₅₀ 。

The dimensionless factor gamma is equal to the ratio d/R _{Maximum value} Where d is the distance from the geometric center of the bubble to the surface to be cleaned at maximum bubble expansion, and R _{Maximum value} Is the maximum expansion diameter of the bubbles, preferably less than 3.5, more preferably less than 1.1, in order to have maximum efficiency, as detailed in publication Mechanisms of single bubble cleaning, f.reuter, ultrasonics Sonochemistry (2016) 550-562.

The density of the medium formed by the cosmetic composition and the bubbles exposed to the sound waves may be from 0.1 to 1g/cm ³ More preferably 0.5 to 1g/cm ³ (at 20℃and atmospheric pressure).

The small bubble size may facilitate their penetration into skin hair follicles, such as hair follicles, thereby exerting an effective cleansing action therein. Thus, it is advantageous for these bubbles to be less than or equal to 300 microns in size and more preferably 200 microns, for example 100 microns or less in size. The air bubbles may then enter the hair follicle and then be sonicated.

Bubble generation

The bubbles may be generated by any suitable means, such as mechanical, physical, chemical or electrochemical means. Bubbles can be generated, inter alia, by negative pressure in the liquid, which makes it possible to reduce the vapor pressure and form a gas in the form of bubbles.

Bubble generation may be cycled prior to, concurrent with, or relative to the emission of the acoustic wave.

As examples of techniques that can be used to generate bubbles in the present invention, there are, in particular, the following techniques:

the liquid is depressurized using a nozzle, for example, possibly pressurized before depressurization,

generating turbulence, in particular using rotating blades, turbine mixers, ejectors, venturi tubes, turbulent gas or liquid flows, rotating porous bodies (in particular rotating disks), generators (as described in publications "Performance of a new micro-bubble generator with a spherical body in a flowing water tube", m.sadatomi, experimental Thermal and Fluid Science 29 (2005) 615-623), venturi tubes and vortices, as used by the company MEC co. (Iona Shower), or shear forces,

using a porous membrane fluidic oscillator as described, for example, in the following article, through the pores of the porous membrane, a laminar flow is generated using focusing or co-focusing of the streams: "Fluidic oscillator-mediated microbubble generation to provide cost-effective mass transfer and mixing efficiency to the wastewater treatment plants", environ. Res.2015, month 2; 137:32-9, emulsifying microchannels, as in article "Monodispersed microbubble formation using microchannel technique"; as described in AIChE Journal,50 (2004), pages 3227-3233, these techniques of generating bubbles by small pore laminar flow are superior to the previous techniques,

-supplying energy:

light energy, for example, by irradiating microfluidic channels capped with nano Kong Jinfu, as described in Progress in Biomedical Optics and Imaging Proceedings of SPIE, volume 9705, article 2016 97050D, "Photothermal generation of microbubbles on plasmonic nanostructures inside microfluidic channels" (Conference paper); by laser irradiation, e.g. as described in "An experimental study on microbubble generation by laser induced breakdown in water", the review of Laser Engineering (journal) (2008), pages 1273-1275 (2); by laser irradiation of carbon nanotubes, as described in chapter "Producing single microbubbles with control size using microfiber", advance in Bioscience and Biotechnology,2 (2011), pages 385-390; through tapered optical fibers, through near infrared plasma absorbers as described in the publication "Size-controllable micro-bubble generation using a nanoimprinted plasmonic nanopillar array absorber in the near-attenuated region", applied Physics Letters,108,2016;

acoustic energy, for example, by ultrasound as described in the following articles: ultrasonics Sonochemistry, volume 29, month 3 of 2016, page 604-611, "Influence of sonication conditions on the efficiency of ultrasonic cleaning with flowing micrometer-sized air bubbles," sonic activation of microbubbles, ultrasonic waves in the presence of nucleation sites, as described in patent application WO 2016/055883,

Electrical energy, for example via an electrically driven coaxial atomizing method, as described in publications "Preparation of microbubble suspensions by co-axial electrohydrodynamic atomization", medical Engineering and Physics,29 (2007), pages 749-754; by electrolysis, electroflotation, by electrolysis of Micro generators, as described in the publication "Micro-fabricated electrolytic Micro-bubbers", international Journal of Multiphase Flow,31 (2005), pages 706-722; by electrostatic spraying, as described in publication "Microbubble generation for environmental and industrial separations", separation and Purification Technology,11 (1997), pages 221-232; heating carbon nanotubes by electrons as described in publication "Microbubble generation with micro-watt power using carbon nanotubes heating elements", 2-5 days of Proceedings of the 7th IEEE International Conference on Nanotechnology,8 months, 2007, hong Kong (2007); or by microplasma, such as chapter Journal of Physics D; applied Physics, volume 47, 35, 9/2014, 3/5, article number 355203; as described in "Microbubble generation by microplasma in water".

Once the device is turned on, bubbles may continue to form. As a variant, the bubbles are generated intermittently, for example only when the composition is dispensed, or periodically at a predetermined frequency, so as to give them time-dispersion. Before the device is turned on, a certain amount of bubbles may be present in the composition.

The intensity of bubble generation may be constant or variable and, where appropriate, may be adjusted by the user or automatically by the device depending on the desired result or at least one operating parameter.

Bubbles may be generated by any of the techniques mentioned above, in particular by injecting a pressurized gas into the composition, for example using a pump or compressed gas tank, by electrolyzing the cosmetic composition, by blending the composition, by sucking a gas into the composition, or by evaporating a liquefied gas mixed with or dissolved in the composition. The bubbles may originate from the reaction of two liquids or one liquid and at least one solid, for example in the form of a powder, a granulate or a tablet or any other form.

The flow rate of the bubble-containing liquid may be in the range of 0.01mL/s to 10 mL/s.

Grinding

The method may include grinding the keratin materials using abrasive particles and/or a portion of the device in contact with the keratin materials.

Grinding may be performed prior to exposure of the cosmetic composition and the foam to sound waves, or as a variant, simultaneously. When grinding has taken place beforehand, it can be carried out via any means, in particular by mechanical or chemical action.

In this case, the grinding of the keratin materials may be caused not only by the shock waves generated after the exposure of the bubbles to the acoustic waves, but also at least in part by the action of the abrasive particles (for example particles present on the surface of the applicator in contact with the external keratin materials) 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 may then preferably generate a gas during their dissolution, which gas will then be used to generate all or some of the bubbles subjected to sound waves.

The abrasive particles may be selected from abrasive powders of materials having a mohs hardness greater than or equal to 3, such as powders of alumina, silica, aluminosilicate or carbonate, or powders of materials coated with silica, alumina or aluminosilicate.

It may also be a nut powder (in particular almond powder), a wood cellulose powder (for example ground bamboo stalk powder), a coconut husk powder, or a synthetic material (for example polyamide), or mixed particles combining organic and inorganic compounds, as well as particles coated with the above compounds.

The abrasive particles may have a size of 0.1 to 500 microns, especially 0.1 to 50 microns for hair treatment and 10 to 300 microns for scalp or facial skin treatment.

The solid particles used to impart the abrasive action may have a flattened, spherical, elongated, polyhedral or irregular shape.

Recycle of

Preferably, the cosmetic composition is contacted with keratin materials for at least partial recovery for recycling.

The recovered composition may be filtered to remove solid debris or particulate phases thereof and then sent again to the surface to be cleaned.

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

Advantageously, the treatment and purification unit comprises a treatment unit inlet for receiving the used composition comprising the composition that has been in contact with the keratin surface, and a separator comprising a slurry collection bowl and a liquid collection chamber.

More advantageously, the spray nozzle is mounted inside the bowl.

Even more advantageously, the spray nozzle comprises a spray nozzle inlet and a spray nozzle outlet, the treatment unit inlet being in communication with the spray nozzle inlet and the spray nozzle outlet present in the slurry collection bowl.

According to an advantageous embodiment, the bowl cover separates the slurry collection bowl from the liquid collection chamber, and a channel passes through the bowl cover to drain the slurry-free composition in the liquid collection chamber. The two chambers can be filled and emptied via the holes (caps). They may be fully sealed and disposable and/or collectable to be cleaned and subsequently refilled via a private network.

Advantageously, the outlet of the centrifugal separator communicates with the liquid collection chamber, and the centrifugal separator is capable of separating the waste liquid from the slurry contained therein by centrifugation of the water with slurry having a higher density than the water on the wall of the slurry collection bowl.

The liquid collection chamber also advantageously includes a deflector that gradually diverts liquid as it enters the chamber, the deflector preventing turbulence from accumulating in the chamber. The chamber may comprise a nonwoven filter made of natural or man-made fibres, filter particles (e.g. sand, silica) or any other means for retaining substances in suspension.

According to a specific embodiment of the invention, the treatment and purification unit comprises a disinfection unit that kills bacteria in the recycled composition, said disinfection unit comprising a UV lamp and/or an ozone or oxidizing agent generator and/or a chemical product or bactericide dispenser and/or a heating device.

The processing and purification unit advantageously comprises an optical contaminant detection unit intended for measuring absorption at least one wavelength and comprising at least one source for generating one or more optical signals at one or more wavelengths; at least one detector for detecting the one or more optical signals at one or more wavelengths and for emitting an electrical signal indicative of the presence of the contaminant.

Preferably, the treatment and purification unit comprises a filter with a pore size of less than or equal to 50 microns. The filter may be a nonwoven with or without pleats.

The filter may be formed by a filter system equipped with a nano-filter and at least one filter quality sensor and at least one pre-filter, the pre-filter being positioned before the nano-filter according to the method, and the filter quality sensor being provided to indicate that the filter system is operating satisfactorily.

More preferably, the optical detection takes place upstream of the filter, so that contaminants that cannot be filtered cannot enter the recirculation pipe.

More advantageously, the unit comprises a reflux pump for sucking the used composition through the centrifugal separator, the reflux pump comprising a pump inlet and a pump outlet, said pump inlet being connected to the centrifugal separator outlet.

Even more advantageously, the unit comprises a filter device comprising a filter device inlet connected to the pump outlet and a treatment unit outlet connected to the filter device outlet.

Preferably, the unit comprises a feed pump feeding water to the unit inlet at a feed rate, wherein the return pump sucks water at a return rate, wherein the feed rate is smaller than the return rate such that the return pump sucks water and air through the centrifugal separator.

Advantageously, the recirculation unit is configured to release no solvent in the form of steam into the external environment, or to release only a small amount of solvent in the form of steam, for example by means of solvent recirculation, which occurs after the solvent has been condensed, for example in the form of steam or liquid.

Chamber

The volume of the chamber is, for example, 5 to 100ml, more preferably 7.5 to 50ml.

Preferably, the chamber and the system for supplying the composition to the applicator member belong to the same refill forming assembly, which can be handled in one piece for installation onto and removal from the device; thus, refilling with product becomes easier.

The refill forming assembly may be designed to be secured to the handpiece, for example to a housing containing the generator therein, preferably by snap fastening.

The refill may include one or more cartridges in which different compositions may be stored. These compositions may be mixed at the time of use and for some of them may be in solid and/or rapidly dissolving powder form.

Advantageously, the cosmetic device according to the invention comprises a cosmetic composition refill, which may be removable or non-removable.

Applicator

The applicator may comprise a porous material and/or a material capable of releasing or diffusing a cosmetic product, in particular an open-cell foam, preferably carried by a removable support, in particular in the form of a frame.

Thus, the applicator may comprise a dispensing orifice, such as a slot, which closes at rest and opens at the pressure of the upstream composition, and has an elasticity allowing an increase in volume during filling and dispensing of the composition, said elasticity continuing after the end of the filling action.

The applicator may comprise an applicator member removably mounted on the device where appropriate; as a variant, the applicator member may be fixed to the applicator. Where appropriate, the device may include means, such as ejector buttons, to make it easier to eject the applicator member for replacement thereof. The applicator may include a chamber for storing a sufficient amount of the composition to allow cleaning of the surface to be cleaned and the air bubbles to contact the surface to be cleaned. The applicator may be designed from flexible and/or rigid materials. The applicator must be able to prevent leakage of the composition intended for cleaning. The applicator may be removable and may be closed to enable the composition to circulate in the loop.

Application of cosmetic compositions

Generally, the composition itself, by virtue of its formulation, can assist in removing impurities that are desired to be removed by the action of bubbles subjected to sound waves. The action of the bubbles subjected to the acoustic wave may accelerate or improve the method. Thus, the combination of the wave generated by the collapse of the bubbles and the action of the composition may have a greater effect than the wave alone or than the composition alone by synergistic action.

The cosmetic composition may be applied in a first stage, in the presence of air bubbles already present therein, and then exposed to sound waves in a second stage following its application to the keratin materials, so as to generate shock waves after the collapse of the air bubbles.

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

The cosmetic composition may also be applied in other ways, and in particular continuously, i.e. when in contact with the keratin materials to be treated, a circulation of the composition is established, for example in a closed or open circuit.

When the circulation occurs in a closed loop, the composition is at least partially recycled. Additional amounts of the composition may be introduced continuously or intermittently into the circuit to compensate for losses.

The circulation can be stopped at any time to facilitate prolonged static contact of the composition on the surface to be cleaned. For example, the cycle may be performed in the absence of air bubbles, allowing for a first contact with the keratin materials in preparation for its cleaning.

In an open loop, the composition is not recycled to carry out the process and is, for example, moved to a collection tank or discharged directly with the wastewater.

Circulation of the composition is carried out, for example, at a flow rate of 0.01 mL/sec to 5 mL/sec.

When the cosmetic composition has been brought into contact with the keratin materials, air bubbles can be formed by means of the air bubble generator of the device (for example acting by electrolysis).

Hand-held piece

The method may be performed with a handpiece placed in contact with the keratin material to be treated.

The handpiece may carry at least one ultrasonic transducer for generating sound waves and may be arranged to hold a sound wave emitting surface at a distance from the surface to be treated.

The handpiece may include at least one flexible lip portion that acts as a spacer to maintain this separation. The flexible lip portion may also participate in confining the cosmetic composition to the space between the surface to be treated and the transducer. The flexible lip portion may facilitate dispensing, spreading, collecting, and/or recycling the composition.

The cosmetic composition may be circulated in a space between the sonic generator of the hand piece and the area to be treated, which space may be adjustable.

As mentioned above, the cycle may occur continuously or intermittently. The space may also be filled with a composition when the handpiece is in place, and sound waves are then generated in the composition filling the space.

Selecting a treated region

The method may be performed on all or part of the skin of the face, scalp or body to clean it.

The area to be treated may in particular be a keratin material area covered with a cosmetic product such as, in particular, a foundation, a lipstick, a blush, a mascara, an eyeliner, a powder, an emulsion, an oil or a sun protection product, and the treatment may be aimed at removing the product.

The method may be performed by moving the handpiece along the area to be treated in order to treat the entire surface covered with the cosmetic product or any substance to be removed.

The method may also be performed to treat areas of skin not coated with cosmetic product for deep cleansing thereof and to remove or treat exogenous or endogenous impurities or imperfections, such as dead skin cells, sebum or sweat marks, dandruff, bacteria, pollution marks, blackheads, pigmented spots, light scars or acne scars. The method may be performed to treat the scalp. The method may also be performed on top of the nail to remove nail polish.

The method may also be performed to clean hair, in particular in order to at least partially remove previously performed stains.

Correlation method

The method according to the invention can be carried out before or after a cosmetic method, such as makeup or massaging.

For example, the skin, hair or eyelashes are made up, and then after a certain time (e.g. less than 24 hours) the cosmetics are removed by the cleaning method according to the present invention.

In another example, skin is cleaned by performing a method according to the present invention, and then the cleaned area is subjected to a treatment (e.g., immediately or less than two hours thereafter), such as massaging and/or applying a treatment composition.

Processing suite

The subject of the invention is also a process kit for performing the method according to the invention as defined above.

The kit comprises:

cosmetic composition, in which bubbles are generated,

-means for exposing the gas bubbles to sound waves in the surface area to be treated.

The composition may be packaged together with the device in the same package.

Where appropriate, the composition is contained in a container arranged to be mounted on the device, the container constituting, for example, a cartridge arranged to be wholly or partly secured into a corresponding housing of the device, or arranged to be connected to the device via a suitable connection, such as a hose.

Cosmetic composition

The composition may generally comprise any compound conventionally included in the formulation of compositions for cleansing and/or caring for human keratin materials that is compatible with the generation of sufficiently stable bubbles prior to the application of sound waves.

Stabilization of bubbles

The cosmetic composition preferably contains at least one compound having a stabilizing effect, such as a surfactant, a particulate compound, a salt, a polymer or any type of compound capable of increasing the lifetime of the gas bubbles in its medium, thereby helping to stabilize the gas bubbles, i.e. to prevent them from coalescing prematurely before being subjected to sound waves, while approaching or contacting the surface to be treated. The time between the moment of bubble generation and the moment they are subjected to sound waves ranges, for example, from a few milliseconds to a few days.

It is well known that there are several factors that promote bubble formation and stability:

amount of surfactant: the surfactant may preferably be present in the composition in micelle form, and thus at a concentration above the critical micelle concentration (CMC: concentration at or above which the surfactant associates to form micelles), including once bubbles are formed. To achieve this, the surfactant concentration in the product is preferably 5 to 10 times the CMC.

Viscosity of the medium: the higher the viscosity of the medium, the more stable the bubbles can be obtained. This can be achieved, for example, using polymers (e.g., proteins) and/or thickeners.

Hardness of water: the foaming capacity of anionic surfactants is generally diminished in hard water due to interaction of ca2+ and mg2+ ions with the surfactant.

Properties of the gas used: if the gas used is slightly water-soluble, the bubbles will be more stable.

Such stabilizing compounds may also exert an effect, in particular a mechanical, chemical and/or biological effect, on the surface to be treated.

The air bubbles may be generated and/or stabilized by any suitable means, such as by using foaming surfactants, such as polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactants, anionic surfactants other than the polyoxyalkylene alkyl (amido) ether carboxylic acids mentioned above, nonionic surfactants, amphoteric and zwitterionic surfactants and mixtures thereof, and/or by using compounds conventionally present in make-up removal compositions, such as alkyl polysaccharides, fatty alcohol polyglycols, oils and mixtures thereof.

Foaming surfactant capable of generating bubbles

As mentioned above, in order to generate bubbles and/or to help stabilize bubbles, compositions suitable for the present invention may comprise at least one foaming surfactant, for example those selected from the group consisting of: (i) polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactants, (ii) anionic surfactants other than anionic surfactant (i), (iii) nonionic surfactants, (iv) amphoteric/zwitterionic surfactants, and mixtures thereof.

The term "anionic surfactant" means a surfactant comprising only anionic groups as ionic or ionizable groups.

In this specification, a substance is said to be "anionic" when it carries at least one permanent negative charge or when it can be ionized into a negatively charged substance under conditions where the composition of the invention (e.g., medium or pH) is used and does not contain any cationic charge.

A substance is said to be "nonionic" when it is neither cationic nor anionic within the meaning of the present patent application, in particular when it does not include any cationic or anionic groups within the meaning of the present patent application.

The term "amphoteric/zwitterionic surfactant" or "amphoteric and zwitterionic surfactant" means a surfactant that contains a central and balanced positive and negative charge and which can therefore behave like an anionic or cationic surfactant by adapting to the medium in which it is present. It becomes anionic in alkaline medium and cationic in acidic medium and corresponds to a nonionic surfactant at neutral pH.

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

Compositions suitable for use in the present invention may comprise at least one polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactant.

Polyoxyalkylene alkyl (amido) ether carboxylic acids which may be used are selected from those of formula (1):

R1(OC ₂ H ₄ )nOCH ₂ COOA (1)

wherein:

r1 represents a linear or branched C ₆ -C ₂₄ Alkyl or alkenyl groups, alkyl (C) ₈ -C ₉ ) Phenyl group, group R2CONH-CH ₂ -CH ₂ -wherein R2 represents linear or branched C ₉ -C ₂₁ An alkyl or alkenyl group; preferably, R1 is C ₈ -C ₂₀ Alkyl groups and more preferably C ₈ -C ₁₈ An alkyl group having a hydroxyl group,

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

-a represents a hydrogen atom, ammonium, na, K, li, mg, ca or a monoethanolamine or triethanolamine residue.

Mixtures of compounds of formula (1), in particular mixtures of compounds in which the radicals R1 are different, can also be used.

Particularly preferred polyoxyalkylene alkyl (amido) ether carboxylic acids are those of formula (1) wherein:

-R1 represents C ₁₂ -C ₁₄ Alkyl, cocoyl, oleyl, nonylphenyl or octylphenyl groups,

-A represents a hydrogen or sodium atom, and

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

Even more preferably, in the compound of formula (1), R1 represents C ₁₂ An alkyl group, a represents a hydrogen or sodium atom and n ranges from 2 to 10.

Preferably using polyoxyalkylenation (C) ₆ -C ₂₄ ) Alkyl ether carboxylic acids and salts thereof, polyoxyalkylenes (C) ₆ -C ₂₄ ) Alkylamidoether carboxylic acids (particularly those containing from 2 to 15 alkyleneoxy groups), salts thereof, and mixtures thereof.

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

Examples of amino alkoxides which may be mentioned include monoethanolamine, diethanolamine or triethanolamine salts, monoisopropanolamine salts, diisopropanolamine salts or triisopropanolamine salts, 2-amino-2-methyl-1-propanolide, 2-amino-2-methyl-1, 3-propanediol salts and tris (hydroxymethyl) aminomethane salts.

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

Among the commercial products that can be preferably used are those sold by Kao corporation under the following names:

NP 70 (r1=nonylphenyl, n=7, a=h),

NP 40 (r1=nonylphenyl, n=4, a=h),

OP 40 (r1=octylphenyl, n=4, a=h),

OP 80 (r1=octylphenyl, n=8, a=h),

OP 190 (r1=octylphenyl, n=19, a=h),

RLM 38(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=4, a=h),

RLM 38NV(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=4, a=na),

RLM 45CA(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=4.5, a=h

RLM 45NV(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=4.5, a=na),

RLM 100(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=10, a=h

RLM 100NV(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=10, a=na),

RLM 130(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=13, a=h

RLM 160NV(R1＝(C ₁₂ -C ₁₄ ) Alkyl, n=16, a=na

Or products sold by the company Sandoz under the following names:

Sandopan DTC-Acid(R1＝(C ₁₃ ) Alkyl, n=6, a=h

Sandopan DTC(R ₁ ＝(C ₁₃ ) Alkyl, n=6, a=na

Sandopan LS24(R ₁ ＝(C ₁₂ -C ₁₄ ) Alkyl, n=12, a=na

Sandopan JA 36(R ₁ ＝(C ₁₃ ) Alkyl, n=18, a=h),

and more particularly products sold under the following names:

RLM 45 (INCI: laureth-5 Carboxylic acid)

RLM 100

RLM 38。

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

(ii) Anionic surfactants other than polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactant (i)

The compositions suitable for use in the present invention may comprise at least one anionic surfactant (ii) other than the polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactant (i).

The anionic surfactant (ii) may comprise one or more sulfate and/or sulfonate and/or phosphate and/or carboxylate groups in its structure, and/or mixtures of these groups, preferably sulfate groups.

The one or more anionic surfactants (ii) may be oxyethylenated and/or oxypropylenated. The total average number of Ethyleneoxy (EO) and/or Propyleneoxy (PO) groups may then be from 1 to 50, and in particular from 1 to 10.

The carboxylic acid anionic surfactants that can be used can thus comprise at least one carboxylic acid or carbonate functional group.

They may be selected from the following compounds: acyl glycinates, acyl lactolactates, acyl sarcosinates, acyl glutamates, alkyl-D-galactosides-uronic acids, and salts of these compounds; the alkyl and/or acyl groups of these compounds contain from 6 to 30 carbon atoms, in particular from 12 to 28, more preferably from 14 to 24 or even from 16 to 22 carbon atoms; these compounds may be polyoxyalkylenated, in particular polyoxyethylenated, and then preferably comprise from 1 to 50 ethylene oxide units, more preferably from 1 to 10 ethylene oxide units.

C of Polyglycoside-polycarboxylic acids can also be used ₆ -C ₂₄ Alkyl monoesters, e.g. C ₆ -C ₂₄ Alkyl polyglycoside-citrate esters, C ₆ -C ₂₄ Alkyl polyglycoside tartrate and C ₆ -C ₂₄ Alkyl polyglycoside-sulfosuccinates and salts thereof.

Preferably, the carboxylic acid anionic surfactant is selected from:

acyl glutamates, especially C ₆ -C ₂₄ Or even C ₁₂ -C ₂₀ Such as stearoyl glutamate, and in particular disodium stearoyl glutamate;

acyl sarcosinates, especially C ₆ -C ₂₄ Or even C ₁₂ -C ₂₀ Such as palmitoyl sarcosinate, and in particular sodium palmitoyl sarcosinate;

acyl lactyllactate, in particular C ₁₂ -C ₂₈ Or even C ₁₄ -C ₂₄ For example behenyl lactoyl lactate, and in particular sodium behenyl lactoyl lactate;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Acyl glycine esters;

particularly in the form of an alkali metal salt, alkaline earth metal salt, ammonium salt or amino alkoxide; and

-mixtures thereof.

The sulfonate anionic surfactants that may be used may thus include at least one sulfonate functional group.

They may be selected from the following compounds: alkyl sulfonates, alkyl amide sulfonates, alkyl aryl sulfonates, olefin sulfonates, paraffin sulfonates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, alkyl amide sulfosuccinates, alkyl sulfoacetates, N-acyl taurates, acyl isethionates; alkyl sulfolaurates; and salts of these compounds; the alkyl groups of these compounds contain from 6 to 30 carbon atoms, especially from 12 to 28, more preferably from 14 to 24 or even from 16 to 22 carbon atoms; the aryl group preferably represents a phenyl or benzyl group; these compounds may be polyoxyalkylenated, in particular polyoxyethylenated, and preferably comprise from 1 to 50 ethylene oxide units, more preferably from 2 to 10 ethylene oxide units.

Preferably, the sulfonate anionic surfactant is selected from:

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Alkyl sulfosuccinates, in particular lauryl sulfosuccinate;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Alkyl ether sulfosuccinates;

-C ₆ -C ₂₄ and is preferably C ₁₂ -C ₁₈ Acyl isethionates;

-mixtures thereof.

Thus, sulfate anionic surfactants that may be used may comprise at least one sulfate functional group.

They may be selected from the following compounds: alkyl sulfates, alkyl ether sulfates, alkyl amido ether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, and salts of these compounds; the alkyl groups of these compounds contain from 6 to 30 carbon atoms, in particular from 12 to 28, more preferably from 14 to 24, or even from 16 to 22 carbon atoms; the aryl group preferably represents a phenyl or benzyl group; these compounds may be polyoxyalkylenated, in particular polyoxyethylenated, and preferably comprise from 1 to 50 ethylene oxide units, more preferably from 2 to 10 ethylene oxide units.

Preferably, the sulfate anionic surfactant is selected from:

-C ₆ -C ₂₄ And especially C ₁₂ -C ₂₀ Alkyl sulfate esters;

alkyl ether sulfates, especially C ₆ -C ₂₄ Or even C ₁₂ -C ₂₀ Alkyl ether sulfates, preferably comprising 2 to 20 ethyleneoxy units;

-mixtures thereof.

When the anionic surfactant (ii) is in salt form, the salt may be selected from alkali metal salts, such as sodium or potassium salts, ammonium salts, amine salts, and in particular amino alkoxides, and alkaline earth metal salts, such as magnesium or calcium salts.

Examples of amino alkoxides which may be mentioned in particular include monoethanolamine, diethanolamine or triethanolamine salts, monoisopropanolamine salts, diisopropanolamine or triisopropanolamine salts, 2-amino-2-methyl-1-propanolide, 2-amino-2-methyl-1, 3-propanediol salts and tris (hydroxymethyl) aminomethane salts.

Preferably, the further anionic surfactant (ii) is selected from:

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Alkyl sulfate esters;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Alkyl ether sulfates, preferably comprising 2 to 20 ethyleneoxy units;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Alkyl sulfosuccinates, in particular lauroyl sulfosuccinates;

-C ₆ -C ₂₄ And especially C ₁₂ -C ₂₀ Alkyl ether sulfosuccinates;

-C ₆ -C ₂₄ and preferably C ₁₂ -C ₁₈ Acyl isethionates;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Acyl sarcosinates, in particular palmitoyl sarcosinates;

-C ₆ -C ₂₄ and especially C ₁₂ -C ₂₀ Acyl glutamates;

-C ₆ -C ₂₄ in particular C ₁₂ -C ₂₀ Acyl glycine esters;

-mixtures thereof.

Among the anionic surfactants (ii), one or more sulfate anionic surfactants are particularly preferred.

Preferably, the one or more anionic surfactants (ii) are in the form of salts, and in particular basic salts, in particular sodium, ammonium, amine salts, including amino alkoxides and/or magnesium salts. These salts preferably contain 2 to 5 ethyleneoxy groups.

The anionic surfactant (ii) is preferably selected from C ₈ -C ₁₄ Alkyl sulfateAnd/or C ₈ -C ₁₄ Alkyl ether sulfates, more preferably C ₁₂ -C ₁₄ Alkyl sulfates and/or C ₁₂ -C ₁₄ Alkyl ether sulfates, more preferably lauroyl (ether) sulfate.

More preferably, C which is oxyethylenated, for example, with 1 to 10mol of ethylene oxide ₁₂ -C ₁₄ Sodium alkyl sulfate, C ₁₂ -C ₁₄ Triethanolamine alkyl sulfate, C ₁₂ -C ₁₄ Alkyl magnesium sulfate or C ₁₂ -C ₁₄ Ammonium alkyl sulfate and/or C ₁₂ -C ₁₄ Sodium alkyl ether sulfate, C ₁₂ -C ₁₄ Ammonium alkyl ether sulfate or C ₁₂ -C ₁₄ Alkyl ether magnesium sulfate.

More preferably, the one or more anionic surfactants (ii) are selected from C which is oxyethylenated with 2.2mol of ethylene oxide ₁₂ -C ₁₄ Sodium alkyl ether sulfate, C ₁₂ -C ₁₄ Ammonium alkyl ether sulfate or C ₁₂ -C ₁₄ Alkyl ether magnesium sulfates, e.g. under the name Texapon N702 by Cognis or under the name Zetesol ^TM 270/N-RSPO-MB from Zschimmer&Those sold by Schwarz (sodium laureth sulfate).

The anionic surfactant (ii) other than the polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactant (i) may be present in an amount ranging from 0.001 to 20% by weight and preferably ranging from 0.1 to 10% by weight relative to the total weight of the composition.

(iii) Nonionic surfactant

Compositions suitable for use in the present invention may comprise at least one nonionic surfactant.

The nonionic surfactant (iii) may be selected from the following compounds:

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

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

R1O-(R2O)t-(G)v

Wherein:

-R1 represents a linear or branched alkyl or alkenyl group comprising 6 to 24 carbon atoms and in particular comprising 8 to 18 carbon atoms, or an alkylbenzene group wherein the linear or branched alkyl group comprises 6 to 24 carbon atoms and in particular 8 to 18 carbon atoms;

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

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

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

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

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

- (d) fatty acid esters of sucrose, preferably comprising at least one saturated or unsaturated, linear or branched C ₈ To C ₄₀ Alkyl chain, preferably C ₁₀ -C ₂₈ Alkyl chains (fatty acids), such as sucrose cocoate and sucrose palmitate;

- (e) polyglycerolated fatty esters, the number of glycerol groups may range from 2 to 30 and comprise at least one saturated or unsaturated, linear or branched C ₈ To C ₄₀ Alkyl chain, preferably C ₁₀ -C ₂₈ Alkyl chains (fatty acids), such as polyglyceryl-5 laurate, polyglyceryl-4 laurate, polyglyceryl-10 laurate or polyglyceryl-6 dicaprate; and

- (f) mixtures thereof.

Preferably, the alkyl (poly) glycosidic nonionic surfactant is a compound of the formula

R1O-(R2O)t-(G)v

Wherein:

-R1 represents a linear or branched, saturated or unsaturated alkyl group comprising 8 to 18 carbon atoms;

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

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

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

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

The glycosidic bond between saccharide units is generally of type 1-6 or 1-4, and preferably of type 1-4. Preferably, the alkyl (poly) glycoside surfactant is an alkyl (poly) glycoside surfactant. Most particularly preferred form 1-4C ₈ To C ₁₆ Alkyl (poly) glycosides, and in particular decyl glucoside and caprylyl/caproyl glucoside.

Among the commercial products, mention may be made of the products named by Cognis corporation(600 CS/U, 1200 and 2000) or +.>(818, 1200, and 2000); by the company SEPPIC under the name->CG 110 and->NS10 sells products; by BASF corporation under the name->The product sold by GD 70, or by Chem Y under the name AG10 LK.

Preferably, form 1-4C is used ₈ To C ₁₆ Alkyl (poly) glycosides, in particular as aqueous 53% solutions, e.g. by Cognis under the reference number818 UP.

According to a preferred embodiment, the nonionic surfactant (iii) may be selected from the following compounds:

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

-C ₆ -C ₂₄ and more particularly C ₈ -C ₁₈ Alkyl (poly) glycosides; and

-mixtures thereof.

According to a more preferred embodiment, the nonionic surfactant (iii) is selected from the group comprising at least one C ₈ -C ₂₀ And preferably C ₁₀ -C ₁₈ The oxyethylenated alcohols of the alkyl chain comprise from 2 to 50 and in particular from 3 to 20mol of ethylene oxide.

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

(iv) Amphoteric/zwitterionic surfactants

Compositions suitable for use in the present invention may comprise at least one amphoteric or zwitterionic surfactant.

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

Mention may be made in particular of C ₈ -C ₂₀ Alkyl sweetVegetable alkali, C ₈ -C ₂₀ Alkylthiobetaines, (C) ₈ -C ₂₀ ) Alkylamide group (C) ₃ -C ₈ ) Alkyl betaines and (C) ₈ -C ₂₀ ) Alkylamide group (C) ₆ -C ₈ ) Alkylthiobetaines.

Optionally quaternized secondary or tertiary aliphatic amine derivatives, as defined above, may be used. Mention may also be made of compounds having the following formulae (II) and (III):

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

wherein:

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

-Rb represents a β -hydroxyethyl group;

rc represents a carboxymethyl group;

-M ⁺ represents a cationic counterion derived from an alkali metal or alkaline earth metal, such as sodium, ammonium or ions derived from an organic amine; and

-X ^- Represents an organic or inorganic anionic counterion, for example selected from C ₁ -C ₄ Alkyl halides, acetates, phosphates, nitrates or sulfates, (C) ₁ -C ₄ ) Alkyl-or (C) ₁ -C ₄ ) Those of alkylaryl sulfonates, in particular methyl sulfate and ethyl sulfate; or alternatively, M ⁺ And X ^- Absence of;

Ra’-CONHCH ₂ CH ₂ -N(B)(B’)(III)

wherein:

-B represents a group-CH ₂ CH ₂ OX’；

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

x' represents a group-CH ₂ COOH、-CH ₂ -COOZ’、-CH ₂ CH ₂ COOH or CH ₂ CH ₂ -COOZ' or a hydrogen atom;

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

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

-Ra 'represents the C of the acid Ra' -COOH ₁₀ To C ₃₀ Alkyl or alkenyl groups, preferably present in coconut oil or hydrolyzed linseed oil, or alkyl groups, especially C ₁₇ Radicals and isoforms, or unsaturated C ₁₇ A group.

These compounds are categorized under the names disodium cocoyl amphodiacetate, disodium lauroyl amphodiacetate, disodium octyl amphodiacetate (diodium caprylamphoacetate), disodium capryloyl amphodiacetate, disodium cocoyl amphodipropionate, disodium lauroyl amphodipropionate, disodium octyl amphodipropionate, disodium capryloyl amphodipropionate, disodium lauroyl amphodipropionate, lauroyl amphodipropionic acid, and cocoyl amphodipropionic acid in the CTFA dictionary, 5 th edition, 1993.

By way of example, mention may be made of the name given by Rhodia companyCocoyl amphodiacetate sold by C2M Concentrate.

Compounds of formula (IV) may also be used:

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

wherein:

y 'represents a group-COOH, -COOZ' or-CH ₂ -CH(OH)SO ₃ H or a group CH ₂ CH(OH)SO ₃ -Z”；

-Rd and Re independently of each other represent C ₁ To C ₄ Alkyl or hydroxyalkyl groups;

-Z "represents a cationic counterion derived from an alkali metal or alkaline earth metal, such as sodium, ammonium or ions derived from an organic amine;

-Ra "means preferably present in coconut oil or hydrolysed linseed oilC of acid Ra "-COOH ₁₀ To C ₃₀ An alkyl or alkenyl group; and

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

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

These compounds may be used alone or as a mixture.

Among the amphoteric/zwitterionic surfactants, the preferred use is (C ₈ -C ₂₀ ) Alkyl betaines, e.g. cocoyl betaine, in particular the product sold by the company PPU Chemco under the name Chegina CC-MB, (C) ₈ -C ₂₀ ) Alkylamide group (C) ₃ -C ₈ ) Alkyl betaines, such as cocoamidopropyl betaine, and mixtures thereof, and compounds of formula (IV), such as the sodium salt of diethylaminopropyl lauryl amino succinamic acid ester (INCI name: sodium diethylaminopropyl coco asparagine).

Preferably, the amphoteric/zwitterionic surfactant is selected from (C ₈ -C ₂₀ ) Alkylamide group (C) ₃ -C ₈ ) Alkyl betaines such as cocoamidopropyl betaine.

More preferably, the amphoteric/zwitterionic surfactant is selected from (C ₈ -C ₂₀ ) Alkyl betaines, such as cocoyl betaine.

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

The foaming surfactants (i), (ii), (iii) and/or (iv) which may generate and/or stabilize bubbles as defined herein may be present in an amount ranging from 0.001 to 20 wt%, preferably from 0.1 to 10 wt%, relative to the total weight of the composition.

The nature of the surfactant can affect the mechanical properties of the bubbles, thereby affecting the power required to collapse the bubbles, smaller bubbles requiring less power.

The one or more surfactants present in the compositions suitable for use in the present invention may also have a cleaning effect, irrespective of the presence of air bubbles.

Air bubble-generating or air bubble-stabilizing compounds conventionally present in make-up removal compositions

As mentioned above, the compositions suitable for the present invention may also comprise at least one compound commonly used in make-up removal compositions, such as (a) alkyl polysaccharides, (b) fatty alcohol ethers of polyethylene glycols, (c) oils, and mixtures thereof, in order to generate and/or stabilize the air bubbles.

a) Alkyl polysaccharides

Compositions suitable for the present invention may comprise at least one alkyl polysaccharide.

Among the suitable alkyl polysaccharides, mention may be made in particular of those having the following general formula (I):

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

wherein the method comprises the steps of

Z is a group derived from a reducing sugar having 5 or 6 carbon atoms or a reducing sugar group having 5 or 6 carbon atoms,

r is C ₆ To C ₃₀ An alkyl or alkenyl group, and a hydroxyl group,

x is either 2 or 3 and is preferably chosen,

n is 1 to 10, and

y is 1 to 10, including all values and subranges therebetween, e.g., 1.5 to 4.

Alkyl polysaccharides (also known as alkyl polyglycosides) which may be used in the cosmetic compositions include those commercially available, for example surfactants sold by Cognis Corporation, amberler, PA.,19002Glucopon (TM) or plantarene (TM). Examples of such surfactants include, but are not limited to:

225: alkyl polyglycosides wherein the alkyl group contains 8 to 10 carbon atoms.

425: alkyl polyglycosides wherein the alkyl group contains 8 to 16 carbon atoms.

625: an alkyl polyglycoside wherein the alkyl group contains from 12 to 16 carbon atoms.

300: alkyl polyglycosides which are substantially the same as the above products but differ in average degree of polymerization.

Glucopon 600: alkyl polyglycosides, which are substantially the same as the products described above, but differ in average degree of polymerization.

Plant (tm) 2000: c having an average degree of polymerization of 1.4 ₈ -C ₁₆ Alkyl polyglycosides.

Plant (TM) 1300: c having an average degree of polymerization of 1.6 ₁₂ -C ₁₆ Alkyl polyglycosides.

Plant (TM) 1200: c having an average degree of polymerization of 1.4 ₁₂ -C ₁₆ Alkyl polyglycosides.

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

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

b) Fatty alcohol ethers of polyethylene glycols

The compositions suitable for the present invention may comprise at least one fatty alcohol ether of polyethylene glycol.

Suitable fatty alcohol ethers of polyethylene glycol include polyethylene glycol derivatives of coco glycerides derived from triglycerides, polyethylene glycol derivatives of caproic acid glycerides, polyethylene glycol derivatives of caprylic acid glycerides, polyethylene glycol derivatives of tallow glycerides, polyethylene glycol derivatives of palmitic acid glycerides, polyethylene glycol derivatives of stearic acid glycerides, polyethylene glycol derivatives of lauric acid glycerides, polyethylene glycol derivatives of oleic acid glycerides, polyethylene glycol derivatives of ricinoleic acid glycerides, and polyethylene glycol derivatives of fatty acid glycerides, such as palm oil, almond oil, olive oil, corn oil, and mixtures thereof.

The fatty alcohol ethers (b) of these polyethylene glycols may be used in an amount ranging from 0.01% to 25% by weight and preferably from 0.1% to 10% by weight, relative to the total weight of the composition, and are preferably surfactants.

c) Oil (oil)

Compositions suitable for use in the present invention may comprise at least one oil.

Suitable oils include those commonly used in make-up removal products. These oils may be selected from mineral, vegetable, synthetic and silicone oils and mixtures thereof.

Among the mineral oils which may constitute the oily phase, mention may in particular be made of liquid paraffin or mineral oils and higher aliphatic hydrocarbons, such as isohexadecane. Among the vegetable oils, mention may be made in particular of jojoba oil, meadowfoam seed oil, almond oil and also safflower oil. Among the silicone oils mention may be made in particular of the cyclopentadimethicone sold under the name Volatile Silicone 7158 by Union Carbide, or the linear volatile silicone oils sold under the name DM Fluid 0.6cs by Shin-Etsu, or the dimethicone sold under the name DC200 by Dow Corning.

Among the synthetic products mention may be made in particular of esters, such as alkyl palmitate, for example isopropyl palmitate or 2-ethylhexyl palmitate, in which the alkyl group contains 2 to 10 carbon atoms, and alkyl adipate, for example bis (2-ethylhexyl) adipate, in which the alkyl group contains 2 to 10 carbon atoms, or esters, for example isononyl isononanoate or derivatives, for example glabrous greenish flower.

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

As other examples, the stabilizing compounds suitable for the present invention are preferably selected from:

-fatty alcohols;

-a polyalkylene glycol;

-fatty acid esters of polyglycerols;

-polyalkylene glycol ethers of alkyl dextrose;

-cellulose;

-by C ₁₀ -C ₁₈ Alkyl glucosides react with 1, 3-dichloro-2-propanol to form crosslinked polymers that are sulfonated with 3-chloro-2-hydroxypropyl sulfonate;

-fatty acid alkanolamides;

-and mixtures thereof.

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

b) The polyalkylene glycols are preferably those of the formula (II)

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

Wherein the method comprises the steps of

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

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

According to a specific embodiment of the present invention, the polyalkylene glycol according to the present invention is polyethylene glycol.

According to a preferred embodiment, the polyethylene glycol according to the invention may be selected from PEG-8, for example under the trade name Polyethylene Glycol 400 Products sold by Clariant company, or PEG-45M, for example under the trade name Polyox WSR N60->Products sold by Dow Chemical company.

C) The polyglyceryl fatty acid esters are preferably monoesters of fatty acids comprising saturated alkyl chains containing from 10 to 18 carbon atoms with polyglycerols containing from 2 to 30mol of glycerol groups.

According to a preferred embodiment, the polyglycerol esterified fatty acid ester according to the invention may be selected from polyglyceryl-2 laurate, for example under the trade name SunSoft Q-12D-A product sold by Taiyo Kagaku company.

D) Polyalkylene glycol ethers of alkyl glucose, and preferably (C ₁ -C ₄ ) Poly (C) of alkyl glucose ₁ -C ₄ ) Alkylene glycol ethers, in particular methyl glucitol polyether-10, e.g. under the trade name Glucam E-10Products sold by Lubrizol, inc., and methyl gluceth-20, e.g., under the trade name Glucam E-20Products sold by Lubrizol corporation.

E) The cellulose is preferably a polyalkylene glycol ether of an alkyl cellulose, such as hydroxypropyl methylcellulose, e.g., under the trade name Benicel K100M HydroxypropylmethylThe product sold by Ashland or by Dow under the name methocel F4M Personal Care Grade.

F)C ₁₀ -C ₁₈ The crosslinked polymer formed by reacting alkyl glucosides with 1, 3-dichloro-2-propanol and sulphonated with 3-chloro-2-hydroxypropyl sulphonate is preferably selected from polymers having the following corresponding INCI names:

Sodium hydroxypropyl sulfonate lauryl glucosideBipolymer, commercially available from Colonial Chemical Inc. under the trade name Poly sulfonateSelling;

sodium hydroxypropyl sulfonate coco glucoside cross-linked polymer, commercially available from Colonial Chemical incSelling; and

sodium hydroxypropyl sulfonate decyl glucoside crosslinked polymer, commercially available from Colonial Chemical Inc. under the trade name Poly sodiumAnd (5) selling.

G) The fatty acid alkanolamides are preferably selected from fatty acids C ₁₂ -C ₁₈ Alkanolamides, e.g. cocamide MEA, e.g. under the trade name ComperlanProducts sold by BASF corporation.

Among the list of stabilizing compounds A) to G) suitable for the present invention, mention may advantageously be made of polyethylene glycols and polyglycerol esterified fatty acid esters, more particularly selected from PEG-45M and polyglycerol-2 laurate.

Preferably, in this list of stabilizing compounds a) to G) suitable for the present invention, polyalkylene glycol ethers of cellulose, in particular of alkyl cellulose (e.g. hydroxypropyl methylcellulose), can be used.

Advantageously, the cosmetic composition suitable for the present invention comprises the stabilizing compound in an amount ranging from 0.001% to 20% by weight, preferably from 0.01% to 10% by weight, relative to the total weight of the composition.

Even more advantageously, when the compound having a stabilizing effect is a polyalkylene glycol ether of cellulose, in particular of an alkyl cellulose (e.g. hydroxypropyl methylcellulose), the 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 0.5% by weight, relative to the total weight of the composition.

According to a specific embodiment, the composition suitable for use in the present invention comprises at least one cellulose as compound having a stabilizing effect, in particular a polyalkylene glycol ether selected from alkyl celluloses, preferably hydroxypropyl methylcellulose.

According to another particular embodiment, the compositions suitable for use in the present invention comprise at least one anionic surfactant (ii) as stabilizing compound, such as those defined herein, in particular selected from C's oxyethylenated with 2.2mol of ethylene oxide ₁₂ -C ₁₄ Sodium alkyl ether sulfate, C ₁₂ -C ₁₄ Ammonium alkyl ether sulfate or C ₁₂ -C ₁₄ The alkyl ether magnesium sulfate is preferably sodium lauryl ether sulfate.

According to another particular embodiment, the composition suitable for use in the present invention comprises at least one amphoteric/zwitterionic surfactant (iv) as stabilizing compound, such as those defined herein, in particular selected from (C) ₈ -C ₂₀ ) Alkyl betaines, preferably cocoyl betaines.

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 a zwitterionic foaming surfactant. The cationic agent used may also have a thickening effect, which is advantageous for bubble stabilization.

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

Examples of quaternary ammonium salts include:

-those having the following general formula (IV):

[ chemical formula 1]

Wherein the radicals R ₁ To R ₄ Which may be the same or different, represent a linear or branched aliphatic group comprising 1 to 30 carbon atoms, or an aromatic group, such as an aryl or alkylaryl group. Aliphatic groups may include heteroatoms such as oxygen, nitrogen, sulfur, and halogen, among others. The aliphatic groups being selected from, for example, alkyl, alkoxy, polyoxy (C ₂ -C ₆ ) Alkylene, alkylamide, (C) ₁₂ -C ₂₂ ) Alkylamide group (C) ₂ -C ₆ ) Alkyl, (C) ₁₂ -C ₂₂ ) Alkyl acetate and hydroxyalkyl groups comprising from about 1 to 30 carbon atoms; x is an anion selected from the group consisting of: halide, phosphate, acetate, lactate, (C) ₂ -C ₆ ) Alkyl sulfate and alkyl sulfonate or alkylaryl sulfonate. Preferably, R ₁ And R is ₂ Represent C ₁ -C ₄ Alkyl or C ₁ -C ₄ A hydroxyalkyl group.

Quaternary ammonium salts of imidazolinium salts, for example salts of the following formula (V):

[ chemical formula 2]

Wherein R is ₅ Represents an alkenyl or alkyl group comprising 8 to 30 carbon atoms, e.g. coconut fatty acid derivatives, R ₆ Represents a hydrogen atom, C ₁ -C ₄ An alkyl group or an alkenyl or alkyl group containing 8 to 30 carbon atoms, R ₇ Represent C ₁ -C ₄ Alkyl group, R ₈ Represents a hydrogen atom or C ₁ -C ₄ An alkyl group, and X ^- Is an anion selected from the group consisting of: halide, phosphate, acetate, lactate, alkylsulfate and alkyl or alkylaryl sulfonate. Preferably, R ₅ And R is ₆ Represents a mixture of alkenyl or alkyl groups containing from 12 to 21 carbon atoms, such as tallow fatty acid derivatives, R ₇ Represents methyl andand R is ₈ Represents hydrogen.

-a diquaternary ammonium salt of formula (VI):

[ chemical formula 3]

Wherein R is ₉ Represents aliphatic radicals containing from about 16 to 30 carbon atoms, R being identical or different ₁₀ 、R ₁₁ 、R ₁₂ 、R ₁₃ And R is ₁₄ Selected from hydrogen or an alkyl group containing 1 to 4 carbon atoms, and X is an anion selected from the group consisting of: halide, acetate, phosphate, nitrate, and methyl sulfate.

Quaternary ammonium salts comprising at least one ester function, such as those of formula (VII) below:

[ chemical formula 4]

Wherein:

-R ₁₅ selected from C ₁ -C ₆ Alkyl group and C ₁ -C ₆ Hydroxyalkyl or dihydroxyalkyl groups;

-R ₁₆ selected from:

-group R ₁₉ -C(＝O)-，

Linear or branched, saturated or unsaturated C-based ₁ -C ₂₂ Radical R of a hydrocarbon radical ₂₀ ，

The radical of a hydrogen atom,

-R ₁₈ selected from:

-group R ₂₁ -C(＝O)-，

Linear or branched, saturated or unsaturated C-based ₁ -C ₆ Radical R of a hydrocarbon radical ₂₂ ，

The radical of a hydrogen atom,

-R ₁₇ 、R ₁₉ and R is ₂₁ May be the same or different and is selected from linear or branched, saturated or unsaturated groupsIn C ₇ -C ₂₁ A group of a hydrocarbon group;

-n, p and r, which may be the same or different, are integers ranging from 2 to 6;

-y is an integer ranging from 1 to 10;

-x and z, which may be the same or different, are integers ranging from 0 to 10;

-X ^- are simple or complex and organic or inorganic anions;

provided that the sum of x+y+z is 1 to 15, when x is 0, then R ₁₆ R represents ₂₀ And when z is 0 then R ₁₈ R represents ₂₂ 。

Alkyl group R ₁₅ May be linear or branched, and more particularly linear.

Preferably, R ₁₅ Represents a methyl, ethyl, hydroxyethyl or dihydroxypropyl group, and more particularly a methyl or ethyl group.

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

When R is ₁₆ Is a hydrocarbon-based group R ₂₀ When it is long and contains 12 to 22 carbon atoms, or short and contains 1 to 3 carbon atoms.

When R is ₁₈ Is a hydrocarbon-based group R ₂₂ When it is, it preferably contains 1 to 3 carbon atoms.

Advantageously, R ₁₇ 、R ₁₉ And R is ₂₁ May be identical or different and is selected from linear or branched, saturated or unsaturated C-based ₁₁ -C ₂₁ Radicals of hydrocarbon radicals, and more particularly linear or branched, saturated or unsaturated C ₁₁ -C ₂₁ Alkyl and alkenyl groups.

Preferably, x and z may be the same or different and equal to 0 or 1.

Advantageously, y is equal to 1.

n, p and r may be the same or different, preferably 2 or 3, and even more particularly equal to 2.

The anion is preferably a halide (chloride, bromide or iodide) or an alkylsulfate, more particularly a methylsulfate. However, methanesulfonate, phosphate, nitrate, toluenesulfonate, anions derived from organic acids (e.g. acetate or lactate), or any other anion compatible with ammonium bearing ester functionality may be used.

Anions X ^- Even more particularly chloride or methyl sulphate.

Ammonium salts of the formula (VII) can be used in particular, in which:

-R ₁₅ represents a methyl or ethyl group;

-x and y are equal to 1;

-z is equal to 0 or 1;

-n, p and r are equal to 2;

-R ₁₆ selected from:

-group R ₁₉ -C(＝O)-；

Methyl, ethyl or C-based ₁₄ -C ₂₂ A group of a hydrocarbon group;

-a hydrogen atom;

-R ₁₈ selected from:

-group R ₂₁ -C(＝O)-；

-a hydrogen atom;

R ₁₇ 、R ₁₉ and R is ₂₁ May be identical or different and is selected from linear or branched, saturated or unsaturated C-based ₁₃ -C ₁₇ The radical of a hydrocarbon radical, and preferably of a linear or branched, saturated or unsaturated C ₁₃ -C ₁₇ Alkyl and alkenyl groups.

Advantageously, the hydrocarbon-based group is linear.

Among the quaternary ammonium salts of formula (IV), on the one hand, tetraalkylammonium chlorides, such as dialkyldimethylammonium chloride or alkyltrimethylammonium chloride, in which the alkyl group contains about 12 to 22 carbon atoms, in particular behenyl trimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium chloride and benzyldimethyl stearyl ammonium chloride, or, on the other hand, palmitylamidopropyltrimethylammonium chloride or stearylaminopropyldimethyl (myristylacetic acid ester) ammonium chloride (under the name70 sold by Van Dyk).

Examples of compounds of formula (V) which may be mentioned include diacyloxyethyldimethyl ammonium, diacyloxyethyl hydroxyethyl methyl ammonium, monoacyloxyethyl dihydroxyethyl methyl ammonium, triacyloxyethyl methyl ammonium and monoacyloxyethyl hydroxyethyl dimethyl ammonium salts (in particular chlorides or methyl sulphates) and mixtures thereof. The acyl group preferably contains 14 to 18 carbon atoms and is more particularly derived from a vegetable oil, such as palm oil or sunflower oil. When the compound contains a plurality of acyl groups, these groups may be the same or different.

These products are obtained, for example, by direct esterification of optionally oxyalkylated triethanolamine, triisopropanolamine, alkyldiethanolamine or alkyldiisopropanolamine with fatty acids or fatty acid mixtures of vegetable or animal origin, or by transesterification of their methyl esters. This esterification is followed by quaternization with alkylating agents, for example alkyl halides (preferably methyl halide or ethyl halide), dialkyl sulfates (preferably dimethyl sulfate or diethyl sulfate), methyl methanesulfonate, methyl p-toluenesulfonate, chloroethylene glycol (glycol chlorohydrin) or glycerol chlorohydrin.

Such compounds are known by the name of Cognis, incUnder the name of Stepan CorpNoxamium by Ceca and +.A. by Degussa>WE 18 and->W75 is sold.

Ammonium salts containing at least one ester function as described in patent US-se:Sup>A-4 874 554 and US-se:Sup>A-4 137 180 may also be used.

Quaternary diammonium salts of formula (VI) suitable for use in the present invention include, inter alia, propane tallow diammonium dichloride.

The cationic surfactant is 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 use in the present invention comprises at least one soap.

Soaps used in the context of the present invention are organic soaps of fatty acids containing from 10 to 22 carbon atoms, more preferably from 12 to 18 carbon atoms.

Fatty acids suitable for use in the present invention may be selected from linear fatty acids, branched fatty acids, and mixtures thereof.

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

Preferably, the fatty acid is a linear fatty acid.

According to a preferred embodiment, the fatty acid may be selected from lauric acid, myristic acid, stearic acid and mixtures thereof.

Neutralizing agents may be added to neutralize the soap.

The neutralizing agent may be selected from amino alcohols such as ethanolamine, amino sugars, amino acids and basic salts thereof. The most preferred neutralizing agent is triethanolamine.

The neutralization of the soap may be achieved by a molar ratio between the neutralizing agent and the fatty acid of at least 1:1.43, preferably at least 1:1.25.

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

The amount to be considered in calculating the soap amount is the total fatty acid content without neutralizing agent.

Thus, the soap content in the composition may be, for example, from 5 wt% to 50 wt%, more preferably from 10 wt% to 35 wt%, and most preferably from 15 wt% to 25 wt%, relative to the total weight of the composition.

In the present invention, the weight ratio of the one or more fatty acids to the one or more surfactants may range from 1.5:1.0 to 5.0:1.0, preferably from 1.6:1.0 to 4.5:1.0, more preferably from 1.7:1.0 to 4.0:1.0.

According to preferred embodiments, the weight ratio of the one or more linear fatty acids to the one or more surfactants may range from 1.5:1.0 to 5.0:1.0, preferably from 1.6:1.0 to 4.5:1.0, more preferably from 1.7:1.0 to 4.0:1.0.

Advantageously, the simultaneous presence of soap and one or more surfactants provides a balance between open foam with large bubbles and creamy foam in addition to providing a quick rinse and clean feel after application of the composition.

Additive agent

The compositions suitable for the present invention may also comprise various additives generally considered in the field of cosmetic compositions, in particular cleansing compositions for human keratin materials or makeup-removing compositions.

Thus, compositions suitable for the present invention may also comprise, inter alia, as additive gelling agents, conventional hydrophilic or lipophilic thickeners, hydrophilic or lipophilic active agents, preservatives (e.g. phenoxyethanol), antioxidants, fragrances, essential oils, emulsifiers, humectants, chelating agents, sequestering agents (e.g. EDTA and salts thereof), vitamins, emollients, polymers different from those mentioned hereinbefore, conditioning agents, humectants, proteins, polypeptides, amino acids and derivatives thereof, buffers, viscosity modifiers, plant extracts or plants. Certain powder or particulate compounds may contribute to the stability of bubbles in the medium by being present at the gas/liquid interface, especially when these powder or particulate compounds are produced from solid components that 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 and preferably ranging from 0.01% to 10% by weight relative to the total weight of the composition.

These additives and their amounts should be such that they do not alter one or more of the desired properties of the compositions of the present invention.

According to a variant, the composition suitable for the present invention may comprise an aqueous medium or an aqueous phase, i.e. the medium comprises an amount of water ranging from 0.1% to 99% by weight, preferably ranging from 50% to 90% by weight and better ranging from 60% to 90% by weight, relative to the total weight of the composition.

The aqueous phase of the composition according to the invention may contain, in addition to water, one or more solvents selected from monohydric alcohols containing from 1 to 6 carbon atoms and polyhydric alcohols and mixtures thereof.

A monohydric alcohol which may be mentioned in particular is ethanol.

When a monohydric alcohol is present, its amount in the composition may range, for example, from 0.1 wt% to 50 wt%, preferably from 0.5 wt% to 15 wt%, and more preferably from 5 wt% to 15 wt%, relative to the total weight of the composition.

For the purposes of the present invention, the term "polyol" is understood to mean any organic molecule comprising at least two free hydroxyl groups.

Polyols which may be mentioned in particular include glycerol; glycols such as butanediol, isopentyl or propanediol, sorbitol; sugars such as glucose, fructose, maltose, lactose and sucrose; and mixtures thereof.

When present, the amount of polyol in the composition may range, for example, from 0.1% to 40% by weight, preferably from 0.5% to 15% by weight, and more preferably from 5% to 15% by weight, relative to the total weight of the composition.

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

For the purposes of the present invention, the term "anhydrous" means that the composition comprises water in an amount of less than or equal to 1% by weight and preferably less than or equal to 0.5% by weight, or even is free of water, relative to the total weight of the composition. Such small amounts of water may be introduced, where appropriate, particularly by components of the composition which may contain residual amounts of water.

According to a further variant, the composition suitable for the present invention may be substantially oily, i.e. it may comprise an oily or fatty phase, i.e. the medium comprises an oil amount ranging from 0.1% to 99% by weight, preferably ranging from 50% to 90% by weight and better ranging from 60% to 90% by weight, relative to the total weight of the composition.

One skilled in the art will note that the ingredients and amounts thereof contained in the compositions are selected so that they do not impair the desired properties of the compositions of the present invention.

If the composition is aqueous, the pH of the composition may be from 4 to 7.5, especially from 4.5 to 6, or may be 10, as is the case with certain foamed products, such as soaps.

Cosmetic compositions suitable for use in the present invention may be rinsed off or left behind after being applied to keratin materials and having been subjected to sound waves.

Compositions suitable for use in the present invention may be prepared according to techniques well known to those skilled in the art.

The composition according to the invention may be in any form conventionally used according to the envisaged application, and in particular in the form of: an aqueous, alcoholic or aqueous-alcoholic or oily solution or suspension, a toner or essence type solution or dispersion, 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 particularly advantageous application, in particular in the field of body and/or hair hygiene, in particular for cleansing the hair and/or scalp, and also for cleansing and/or cleansing the body and/or facial skin. Thus, it may constitute a shampoo or shower gel, or alternatively a mask to be rinsed off.

The expressions "between..and..and" ranging from..to..are to be understood as meaning the inclusion of the limits unless otherwise indicated.

In the description and examples, percentages are by weight. The ingredients are mixed in an order and under conditions readily ascertainable by one skilled in the art.

Drawings

The invention will be more clearly understood from a reading of the following detailed description of non-limiting embodiment examples of the invention and a review of the accompanying drawings, in which:

figure 1 schematically shows the use of an example of a processing device according to the invention,

FIG. 2 is a schematic longitudinal section of another example of a processing apparatus for carrying out the invention,

figure 3 is a view similar to figure 2 of a variant of embodiment of the invention,

FIG. 4 schematically illustrates various components of the apparatus of FIG. 3, an

Fig. 5 schematically shows an embodiment variant.

Detailed Description

The method according to the invention involves exposing the bubbles present in the cosmetic composition to sound waves.

Fig. 1 shows a first example of the implementation of the invention, in which a cosmetic composition C containing air bubbles is present at the surface of the keratin materials K to be treated, and the treatment device 1 is brought into contact with the composition C to emit sound waves therein.

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

Keratin materials K consist of, for example, facial skin or hair.

For example, this is a problem of cleaning the skin to remove cosmetic marks more quickly and effectively.

The treatment device 1 comprises a handpiece carrying an ultrasonic generator 10 in contact with the composition and emitting sound waves from the ultrasonic generator 10.

The handpiece can be held in the hand to allow some room for the keratin materials K and to avoid the sonotrode coming into contact with it.

As a variant, the handpiece is arranged to maintain such a gap by means of one or more members intended to contact the proteinaceous material, and the sonotrode 10 is retracted relative to the gap.

Under the action of the acoustic wave, the bubbles themselves undergo rupture, thereby generating a shock wave, which proved to be effective in cleaning the skin.

Examples

Example 1

Artificial skin test

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

An artificial skin (BioSkin brand) sample was prepared, on which a permanent foundation with a thickness of more than 20 microns was applied.

The product was dried at room temperature for 15 minutes and dried with a blower for 2 minutes.

An ultrasonic generator that emits sound waves at a frequency of about 35kHz is used and maintained about 2 to 3mm from the skin in contact with the composition.

The sonotrode is slowly moved into contact with the composition (within the foam) without contacting the foundation film.

In the region passed by the ultrasonic generator when activated, a strong foundation removal was observed, whereas in the region passed by it when turned off, no removal was observed.

Furthermore, it was observed that it was very difficult to remove the cosmetic by simply sweeping the cosmetic with a sponge or brush, which demonstrates the cleaning effect obtained by the present invention.

Example 2

Natural skin explant test

Similar tests were performed on skin explants and foundation removal was observed after one or even two passes.

The compositions tested are, for example, identical to the composition of example 1, to within one dilution factor.

A test was also performed for mark removal by a mark pen that did not erase, and a substantial disappearance of the mark was observed after two passes.

Compositions tested

Compositions C1 to C12 in the form of foaming solutions were prepared by mixing the compounds described in tables 1, 2, 3 and 4 below.

The compositions were prepared using the following weight ratios. The percentages are given by weight relative to the total weight of the composition. The percentage of Active Material (AM) is also indicated if necessary.

TABLE 1

TABLE 2

TABLE 3

TABLE 4

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

TABLE 5

Composition and method for producing the same	d minimum bubble (m)	d median bubble (m)	d bubble maximum (m)
				C1	1.93E-04	4.21E-04	6.65E-04
C2	1.71E-04	2.40E-04	3.97E-04
				C3	1.12E-04	1.00E-04	3.14E-04
C4	9.00E-05	1.58E-04	2.43E-04
				C5	6.80E-05	1.39E-04	2.43E-04
C6	8.60E-05	1.72E-04	2.67E-04
				C7	9.30E-05	1.58E-04	2.99E-04
C8	9.80E-05	1.58E-04	2.20E-04
				C9	9.90E-05	1.42E-04	2.87E-04
C10	6.40E-05	1.03E-04	1.46E-04
				C11	6.40E-05	9.70E-05	1.44E-04
C12	5.90E-05	8.57E-05	1.38E-04

Wherein the hydroxypropyl methylcellulose polymer is present in an amount of 0.3 wt% to 0.5 wt% of the composition relative to the total weight of the composition are those that contain minimal air bubbles and tend to be the most effective.

Example 3

Test on hair

Hair samples were prepared, namely:

untreated hair strands for reference

A lock of identical hair dyed with the product Colorista Washout L' Or al Paris;

tresses of the same hair dyed with the dyeing product Majirouge 6.66l' oraal Pro.

The ultrasonic generator emitting at 34kHz passes 10 times on each strand.

It was observed that the reference strands of hair substantially retained their color despite treatment.

This method produces a significant lightening of the hair strands dyed with composition Colorista Washout, with a Δe of about 9, and less bleaching of the hair strands treated with composition Majirouge, but still visible, with a Δe of about 4.

In the example of fig. 1, composition C is applied, for example, using a pressurized container that generates foam, and then the handpiece carrying the sonotrode is brought into contact therewith.

The composition may also be applied by means of a device that generates sound waves, as shown in fig. 2.

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

As shown, the device 1 may comprise a chamber 12 in which the composition C circulates and at least one ultrasonic transducer 13 emitting sound waves in the chamber 12. Transducer 13 is powered by a generator 15, which generator 15 may or may not form part of the handpiece, for example, as found in a base station to which the handpiece is connected via a cable.

Composition C may be carried into chamber 12 via tube 16 and may be from, for example, a composition reservoir.

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

The bubble generator 17 is only schematically shown in fig. 2, since it can have very different embodiments, involving electrolysis or other phenomena.

In one variation, the air bubbles are generated in the reservoir.

Bubbles are generated at a sufficiently short distance from the outlet 11 to approach or contact the area to be treated.

Composition C may contain any compound, as previously detailed, that enables bubbles to be generated and present in the composition for a time sufficient for them to be delivered to the area to be treated.

In the example of fig. 2, the handpiece is moved along the area to be treated and the composition dispensed via the outlet 11 is not recirculated.

In the variant of fig. 3, recirculation of the composition is performed and represented.

In this example of fig. 3, the device 1 for carrying out the method according to the invention comprises at least one transducer 13 for emitting sound waves in a chamber 12, as in the example of fig. 2.

However, the composition C dispensed via the outlet 11 onto the area K to be treated is recovered by at least one pipe 18 for recirculation.

In the example considered, this duct 18 appears around the outlet 11 in order to recover the composition that has been in contact with the area to be treated.

Where appropriate, the device 1 may include a sealing member 19 (e.g., a flexible lip) around the tube 18 to contain the composition and facilitate its return via the tube 18.

The tube 18 communicates with a suction pump 20. As shown, the suction pump 20 can deliver the returned composition to a filter 21. The filter may be arranged to prevent particles suspended in the composition, for example skin debris removed during cleaning.

The composition is again fed into the chamber at the outlet of the filter 21.

The composition may come from a schematically represented reservoir 22, such as a reservoir 22 carried by a hand piece.

The reservoir makes it possible to fill the circuit in which the composition circulates during operation of the device and to compensate for any loss of composition without a portion thereof being recycled.

The filter 21 may be carried by the reservoir, for example, to allow for automatic replacement of the composition when it is used up and the reservoir is replaced.

As shown in fig. 4, the device 1 may comprise electronic circuitry controlling the operation of one or more transducers 13, including a control unit 30, for example with a microcontroller, carried by and/or divided between a possible base station and the handpiece, or present only on the base station.

The control unit 30 may communicate with a human-machine interface 31, which human-machine interface 31 may comprise a screen and/or control buttons, or even with a terminal, such as a mobile phone, via a wireless connection.

The interface 31 may allow for adjusting certain operating parameters of the device, such as the intensity of emitted sound waves and/or generated bubbles, for example.

The electronic circuitry may control the operation of the pump 20, the generator 15 powering the one or more transducers 13, or the bubble generator 17, and may receive data from one or more sensors 35 (e.g., sensors for applying the handpiece to the skin). In the latter case, the control unit cannot activate the pump 20, emit sound waves and generate bubbles unless the area to be treated is in place in front of the outlet 11 in a manner that allows recirculation of the composition.

Needless to say, the present invention is not limited to the example just described.

For example, as shown in fig. 5, the device may include an outlet 11 for dispensing the composition with bubbles and a transducer 13 arranged offset relative to the outlet 11. In this case, the bubble-filled composition applied to the region to be treated K passes under the transducer 13 after moving the handpiece relative to the region to be treated, where it is exposed to sound waves.

A spacer member 19 (e.g., a flexible lip) may be used to space the transducer 13 from the area to be treated, e.g., to prevent direct contact with the skin.

Claims

1. A method for cleaning external human keratin materials in contact with a cosmetic composition in which gas bubbles are present and/or generated, comprising the steps of: subjecting gas bubbles present in the cosmetic composition (C) in the surface area of the material to be cleaned to sound waves to collapse the gas bubbles and create a mechanical impact on the surface to be cleaned to remove dirt therefrom, the cosmetic composition being continuously applied.

2. A method for cleaning external human keratin materials in contact with a cosmetic composition in which gas bubbles are present and/or generated, comprising the steps of: subjecting gas bubbles present in the cosmetic composition (C) in the surface area of the material to be cleaned to acoustic waves to collapse the gas bubbles and create a mechanical impact on the surface to be cleaned to remove dirt therefrom,

The cosmetic composition is applied in a first stage in the presence of air bubbles therein, and then exposed to sound waves in a second stage following its application to generate shock waves after the air bubbles are ruptured,

the treated area is the area of skin that is cosmetic coated.

3. The method of any one of claims 1 and 2, the composition having a total content of one or more cleaning actives of at least 0.02 mass% relative to the total weight of the composition.

4. The method according to any of the preceding claims, wherein the frequency of the sound waves is in the range of 0.3kHz to 5MHz, preferably 10kHz to 1MHz, and the power of the sound waves is in the range of 30mW to 100W/cm ² And more preferably 0.1 to 10W/cm ² 。

5. A method according to any preceding claim, comprising abrading keratin materials with abrasive particles.

6. The method of any preceding claim, wherein the cosmetic composition in contact with keratin materials is at least partially recovered and recycled.

7. The method of any one of claims 1 and 3 to 6, the cosmetic composition being applied in a first stage in the presence of air bubbles therein and then exposed to the sound waves in a second stage following its application to generate shock waves after the air bubbles collapse.

8. The method of any one of claims 2 to 6, the cosmetic composition being continuously administered.

9. The method according to any one of claims 1 and 3 to 8, the treated area being a skin area, in particular a cosmetic coated skin area.

10. The method according to any one of claims 1 and 3 to 8, the treated area being a hair area, in particular dyed hair, nail tip or scalp.

11. Kit, in particular for performing the method according to any of the preceding claims, comprising:

cosmetic composition (C) in which bubbles are generated,

-means (10) for exposing said bubbles to sound waves in the surface area to be treated.

12. The method according to any one of claims 1 to 10 or the kit according to claim 11, wherein the cosmetic composition comprises at least one lathering surfactant selected from the group consisting of: (i) a polyoxyalkylene alkyl (amido) ether carboxylic acid anionic surfactant, (ii) an anionic surfactant different from said anionic surfactant (i), (iii) a nonionic surfactant, (iv) a amphoteric/zwitterionic surfactant, and mixtures thereof, and/or at least one compound selected from the group consisting of: (a) alkyl polysaccharides, (b) fatty alcohol ethers of polyethylene glycols, (c) oils, and mixtures thereof.

13. Device for cleaning external human keratin materials, in particular for performing the method according to any one of claims 1 to 10, comprising an applicator (10) arranged to dispense a cosmetic composition C onto an area to be treated via at least one outlet (11), a chamber (12) in which the composition circulates and at least one ultrasonic transducer (13) to emit sound waves within the chamber (12), the transducer (13) being powered by a current generator (15), and a bubble generator (17) generating gas bubbles within the composition to be subjected to the sound waves emitted by the transducer (13), characterized in that the device further comprises a system for at least partially recovering and recirculating the cosmetic composition in contact with the keratin materials.

14. The device according to claim 13, characterized in that the recovery and recirculation system comprises a pipe (18) emerging close to the outlet (11) and communicating with a suction pump (20) which feeds the returned composition into a filter (21), said composition being fed again into the chamber at the outlet of the filter (21) and then redistributed onto the area to be treated.

15. Cosmetic device according to claim 14, characterized in that said tube (18) is present around said outlet (11).

16. The device according to any of the preceding claims 14 and 15, characterized in that it comprises a sealing member (19), such as a flexible lip, surrounding the tube (18) to contain the composition and promote its return via the tube (18).

17. The device according to any one of claims 13 to 16, characterized in that it comprises a reservoir (22) for compensating any loss of the composition without a portion of the composition being recycled.

18. The device according to any one of claims 13 to 17, wherein the frequency of the sound waves is in the range of 0.3kHz to 5MHz, preferably 3kHz to 1MHz, even more preferably 10kHz to 500kHz, and the power of the sound waves is in the range of 30mW to 100W/cm ² And more preferably 0.1 to 10W/cm ² 。

19. The device according to any one of claims 13 to 18, wherein the applicator (10) comprises an abrasive surface to abrade keratin materials.

20. The device of any one of claims 13 to 19, wherein the device comprises a cosmetic composition refill, which may or may not be removable.