The subject of the present invention is a device comprising a water-oil two-phase composi- tion containing an amphoteric surfactant and a fatty acid salt and a dispenser for dispensing the composition in foam form.

The invention also relates to a process for the treatment of keratin materials using the composition dispensed in foam form. Cleansing cosmetic compositions are commonly used to cleanse keratin materials, in particular the skin, in particular when they are covered with makeup products such as a foundation.

These cosmetic compositions intended for cleansing keratin materials must have application qualities such as a glide effect and a foam quality and quantity, while being friendly to these keratin materials which may be relatively sensitive (eyes, mucous membranes, skin). Furthermore, they must have an appropriate viscosity in order to guarantee effective, simple and pleasant use by the consumer.

Consumers are also increasingly seeking cosmetic products with an attractive esthetic ap- pearance.

An objective of the present invention is to provide a cosmetic composition used in the form of a foam, in particular a non-aerosol foam, having satisfactory properties in terms of cleansing keratin materials, in particular the skin, and also a visual effect that the user finds attrac- tive.

The inventor has discovered that such a composition can be obtained by preparing an oil- water two-phase composition comprising an amphoteric surfactant and an anionic surfactant chosen from fatty acid salts, and by dispensing the two-phase composition with a foam dispenser as described below.

The two-phase composition at rest, in particular after 24 hours, has a clear interface and the aqueous phase is transparent without any apparent deposit. When the user shakes the composition at the time of use, the composition forms an emulsion and becomes uniform. The two-phase composition packaged in a device equipped with a foam dispenser, in particular with a self-foaming pump, makes it possible to obtain a foam of good quality: the foam is dense, tight, and holds well, in particular after 10 minutes and after 20 minutes following dispensing by the self-foaming pump. Thus, after it has been dispensed into the palm of the hand, it can be easily spread on the surface of the hand without losing its con- sistency and can then be applied to a large surface area of the face to be cleansed. After the application of the composition in foam form to the skin and rinsing with water, the skin is clean and does not feel tight. After use, the composition at rest shows rapid phase separation with clear separation of the two phases.

This result is obtained using a fatty acid salt as previously described, whereas other anionic surfactants, such as sodium laureth sulfate and sodium lauroyl sarcosinate, are not suitable, as shown by the examples described below. Application US 2003/003069 describes a two-phase composition in which the upper phase contains a solution of foaming surfactant and the lower phase contains a high-density aromatic ester.

Application WO 04/098559 describes, in examples 5 and 6, two-phase compositions containing sodium lauroamphoacetate, lauric acid and sodium chloride.

Application FR-A-2837697 describes, in comparative example 1 , a composition containing potassium palmitate, potassium myristate, potassium laurate, potassium stearate and sodium cocoamphoacetate; the composition is unstable and undergoes phase separation. Application EP-A-1 108421 describes a pump dispenser bottle device containing a two- phase composition without fatty acid, and nothing suggests therein adding a fatty acid so as to have a visually attractive product which delivers a good foam.

More specifically, a subject of the invention is a non-aerosol device comprising a bottle equipped with a mechanical pumping system and comprising a composition and a dispensing system which makes it possible to deliver the composition in foam form,

said composition comprising an aqueous phase and an oily phase that are visually distinct and superimposed, an amphoteric surfactant and a fatty acid salt.

A subject of the invention is also a process for the non-therapeutic cosmetic treatment of keratin materials, comprising the application to the keratin materials of a composition ob- tained with the non-aerosol device described previously. The process may be a cosmetic process for caring for or cleansing keratin materials.

The composition according to the invention comprises at least one aqueous phase and one oily phase that are visually distinct. These two phases are distinct, i.e. they are visible one on top of the other at rest and are separated by a single interface. The two phases may or may not be colored.

The duration of the phase separation may range from 3 to 30 minutes, better still from 5 to 25 minutes and preferably from 10 to 20 minutes.

In particular, the two-phase composition according to the invention has a clear interface after standing for 24 hours. Advantageously, the aqueous phase constitutes the lower phase of the composition. Since the composition according to the invention is intended for topical application, it advantageously contains a physiologically acceptable medium, i.e. a medium that is compatible with the skin, mucous membranes, the hair and the scalp. The composition according to the invention comprises at least one amphoteric surfactant.

The amphoteric surfactant is chosen from amphoteric surfactants well known to those skilled in the art (this term including amphoteric and zwitterionic surfactants).

According to one embodiment, the amphoteric surfactant is chosen from secondary or ter- tiary aliphatic, optionally quaternized, amine compounds comprising a linear or branched hydrocarbon-based chain containing from 8 to 22 carbon atoms, or a mixture of such hydrocarbon-based chains, and comprising at least one anionic group, such as for example a carboxylate, sulfonate or sulfate group. The amphoteric surfactant can be chosen from N-(C8-C22)alkylbeta ^' i ^' nes, N-(Cs-C22)alkyl- sulfobetames, N-(C8-C22)alkylamido(Ci-C6)alkylbetames, N-(C8-C22)alkylsultaines, N-(Cs- C22)alkylhydroxysultaines, N-(C8-C22)alkylamido(Ci-C6)alkylhydroxysultaines, N-(Cs-C22)al- kylamphoacetates, N-(C8-C22)alkylamphodiacetates, N-(C8-C22)alkylamphopropionates, N- (C8-C22)alkylamphodipropionates, N-(C8-C22)alkylamphohydroxypropylsulfonates, diethyla- minopropyl cocoaspartamide, and mixtures thereof.

These surfactants are in particular referenced in the catalog of the organization The Per- sonnal Care Product Council (url link http://www.personalcarecouncil.org ).

The C8-C22 alkyl group can be chosen from octyl (or caprylyl), decyl (or capryl), lauryl, myri- styl, palmityl, stearyl, arachidyl, behenyl groups, and mixtures thereof.

As N-(C8-C22)alkylbetames, mention may be particularly made of cocobetaine, such as the product sold under the name Dehyton AB-30® by the company Cognis, decylbetaine (or decyl dimethyl glycine) , laurylbetame (or lauryl dimethyl glycine), such as the product sold under the name Genagen KB® by the company Clariant, myristylbetame (or myristyl dimethyl glycine), cetylbetame (or cetyl dimethyl glycine), or stearylbetame (or stearyl dimethyl glycine).

In a known manner, the coco group denotes the alkyl group deriving from coconut oil. It comprises predominantly a mixture of lauryl and myristyl groups.

Advantageously, the N-(C8-C22)alkylbetames are cocobetaine.

Among the N-(C8-C22)alkylamido(Ci-C6)alkylbetames, mention may be made for example of cocamidopropyl betame (or coamidopropyl dimethyl glycine), for example sold under the name Dehyton® PK 45 by the company BASF, cocoamidoethyl betame, for example sold under the name Silsoft® SILK PMF by the company Momentive Performance Materials, lauramidopropyl betame sold under the name Rewoteric AMB12P® by the company Witco, myristamidopropyl betame, stearamidopropyl betame, capryl/capramidopropyl betame, and palmitamidopropyl betame.

Advantageously, the N-(C8-C22)alkylamido(Ci-C6)alkylbetames are chosen from N-(Cs- C22)alkylamidopropyl betames, such as those mentioned previously, and are preferentially cocamidopropyl betame.

As N-(C8-C22)alkylsulfobetames, mention may be made of lauryl sulfobetame.

As N-(C8-C22)alkylsultaines, mention may be made of capryl sultaine, lauryl sultaine, myri- styl sultaine, and cocosultaine.

As N-(C8-C22)alkylhydroxysultaines, mention may be made of capryl hydroxysultaine, lauryl hydroxysultaine (for example Betadet® S-20 from Kao), myristyl hydroxysultaine, coco hydroxysultaine and cetyl hydroxysultaine.

As N-(C8-C22)alkylamido(Ci-C6)alkylhydroxysultaines, mention may be made of cocamidopropyl hydroxysultaine (such as the product sold under the name Amonyl 675 SB by the company SEPPIC or Betadet® SHR from Kao , lauramidopropyl hydroxysultaine , and myristamidopropyl hydroxysultaine.

As N-(C8-C22)alkylamphoacetates, mention may be made for example of:

sodium N'-cocoyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium cocamphoacetate);

sodium N'-caproyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium caproamphoacetate);

sodium N'-capryloyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium capryloamphoacetate);

sodium N'-isostearoyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium isostearoamphoacetate);

sodium N'-lauroyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium lauroamphoacetate);

sodium N'-myristoyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium myristoamphoacetate);

sodium N'-palmitoyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: so- dium palmamphoacetate);

sodium N'-stearoyl-N-hydroxyethyl-N-carboxymethylethylenediamine (CTFA name: sodium stearoamphoacetate).

As N-(C8-C22)alkylamphodiacetates, mention may be made for example of: - disodium N'-cocoyl-N-carboxymethoxyethyl-N-carboxymethylethylenediami ne (CTFA name: disodium cocamphodiacetate), such as the product sold under the name Miranol C2M CONCENTRE NP® by the company Rhodia Chimie;

- disodium N'-caproyl-N-carboxymethoxyethyl-N-carboxymethylethylenediam ine (CTFA name: disodium caproamphodiacetate);

- disodium N'-capryloyl-N-carboxymethoxyethyl-N-carboxymethylethylenedi amine (CTFA name: disodium capryloamphodiacetate);

- disodium N'-isostearoyl-N-carboxymethoxyethyl-N-carboxymethylethylene diamine (CTFA name: disodium isostearoamphodiacetate);

- disodium N'-lauroyl-N-carboxymethoxyethyl-N-carboxymethylethylenediam ine (CTFA name: disodium lauroamphodiacetate);

- disodium N'-stearoyl-N-carboxymethoxyethyl-N-carboxymethylethylenedia mine (CTFA name: disodium stearoamphodiacetate). Advantageously, the N-(C8-C22)alkylamphodiacetates are disodium cocamphodiacetate.

As N-(C8-C22)alkylamphopropionates, mention may be made for example of:

sodium N'-cocoyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium cocamphopropionate), such as the product sold under the name Rewoteric AM KSF 40 by the company Evonik Goldschmidt (code 52683);

sodium N'-caproyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium caproamphopropionate);

sodium N'-capryloyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium capryloamphopropionate);

sodium N'-isostearoyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium isostearoamphopropionate);

sodium N'-lauroyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium lauroamphopropionate);

sodium N'-stearoyl-N-hydroxyethyl-N-carboxyethylethylenediamine (CTFA name: sodium stearoamphopropionate).

As N-(C8-C22)alkylamphodipropionates, mention may be made for example of:

cocoamphodipropionic acid;

lauroamphodipropionic acid;

diethanolamine cocoamphodipropionate;

disodium N'-cocoyl-N-carboxyethoxyethyl-N-carboxyethylethylenediamine (CTFA name: disodium cocoamphodipropionate), such as the product sold under the name Mackam 2CSF 40 CG by the company Solvay;

disodium N'-caproyl-N-carboxyethoxyethyl-N-carboxyethylethylenediamin e (CTFA name: disodium caproamphodipropionate);

disodium N'-capryloyl-N-carboxyethoxyethyl-N-carboxyethylethylenediam ine (CTFA name: disodium capryloamphodipropionate); disodium N'-isostearoyl-N-carboxyethoxyethyl-N-carboxyethylethylenedi amine (CTFA name: disodium isostearoamphodipropionate);

disodium N'-lauroyl-N-carboxyethoxyethyl-N-carboxyethylethylenediamin e (CTFA name: disodium lauroamphodipropionate).

As N-(C8-C22 alkyl)amphohydroxypropylsulfonates, mention may be made of sodium capro- amphohydroxypropylsulfonate, sodium capryloamphohydroxypropylsulfonate, sodium co- coamphohydroxypropylsulfonate, such as the product sold under the name Miranol CS CONCENTRE by the company Solvay, sodium lauroamphohydroxypropylsulfonate, and so- dium stearoamphohydroxypropylsulfonate.

The N-(C8-C22)alkylamphoacetates, N-(C8-C22)alkylamphodiacetates, N-(Cs-C22)al- kylamphopropionates, N-(C8-C22)alkylamphodipropionates and N-(Cs-C22 alkyl)amphohy- droxypropylsulfonates described previously can be in free acid form or in salt form, in par- ticular in the form of alkali metal (such as sodium or potassium) salts or alkaline-earth metal (calcium, magnesium) salts, and preferably in the form of sodium salt.

Use may also be made of sodium monodiethylaminopropylcocoaspartamide, such as the product sold under the name Chimexane HB by the company Chimex.

Preferably, the amphoteric surfactant can be chosen from N-alkyl(C8-C22)betames, N-al- kyl(C8-C22)amidoalkyl(C6-C8)betames, N-alkyl(C8-C22)amphoacetates, and mixtures thereof.

According to one preferred embodiment, the amphoteric surfactant is an N-alkyl(Ce-C22)be- taine, preferably cocobetaine.

The amphoteric surfactant can be present in the composition according to the invention in a content ranging from 1 % to 10% by weight, preferably ranging from 2% to 7% by weight and more preferentially from 2% to 4% by weight, relative to the total weight of the compo- sition.

The composition according to the invention also contains a fatty acid salt.

The fatty acid salt is advantageously a monocarboxylic acid salt comprising from 8 to 18 carbon atoms.

It is more particularly a salt of a fatty acid chosen from caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, or mixtures thereof such as cocoate salts. The fatty acid salt can be chosen from alkaline metal salts, alkaline-earth metal salts or amine salts. The salt can be chosen from sodium, potassium, calcium, magnesium, ammonium, diethanolamine, triethanolamine and triisopropanolamine salts. As examples of fatty acid salts, mention may be made of:

sodium or potassium caprate;

sodium or potassium caprylate;

sodium or potassium or magnesium or calcium or ammonium or triethanolamine laurate; sodium or potassium or magnesium or calcium or diethanolamine or triethanolamine or triisopropanolamine myristate;

sodium or potassium or magnesium or triethanolamine palmitate;

sodium or potassium or magnesium or triethanolamine cocoate;

sodium or potassium or magnesium or ammonium or diethanolamine or triethanolamine stearate;

sodium or potassium or ammonium oleate;

sodium arachidate;

sodium or potassium or calcium behenate. Advantageously, use is made of a salt of a monocarboxylic acid having from 12 to 16 carbon atoms or mixtures thereof, such as those described previously. In particular, use may be made of a salt of a mixture of lauric acid and myristic acid. A cocoate salt is preferentially used. According to one embodiment, the composition of the invention comprises a fatty acid salt chosen from potassium myristate, potassium laurate, sodium laurate, sodium cocoate, potassium cocoate, and mixtures thereof.

The fatty acid salt can be present in the composition according to the invention in a content ranging from 3% to 15% by weight, preferably ranging from 3% to 12% by weight and more preferentially from 4% to 8% by weight, relative to the total weight of the composition.

Advantageously, the fatty acid salt and the amphoteric surfactant are present in the composition according to a fatty acid salts /amphoteric surfactant weight ratio which can range from 1.5 to 2.5, and preferably ranging from 1 .7 to 2.3, and preferentially ranging from 1 .8 to 2.2.

Thus, a subject of the invention is also a composition comprising an aqueous phase and an oily phase that are visually distinct and superimposed, an amphoteric surfactant and a fatty acid salt, characterized in that the fatty acid salt and the amphoteric surfactant are present in the composition according to a fatty acid salts / amphoteric surfactant weight ratio ranging from 1.5 to 2.5.

The composition according to the invention comprises an aqueous phase.

Advantageously, the aqueous phase is present in a content ranging from 35% to 80% by weight, preferably from 40% to 70% by weight and preferentially from 40% to 60% by weight, relative to the total weight of the composition. The aqueous phase comprises water and all of the ingredients of the composition that are present in the water, that is to say the ingredients that are water-soluble or water-miscible at the temperature of 25°C. According to one embodiment, the composition according to the invention comprises from 10% to 76%, preferably from 15% to 66%, and preferentially from 15% to 56% by weight of water, relative to the total weight of the composition.

The composition may also comprise a polyol that is water-miscible at ambient temperature (25°C), in particular chosen from polyols having in particular from 2 to 6 carbon atoms, such as glycerol, propylene glycol, butylene glycol, pentylene glycol and hexylene glycol.

The water-miscible polyol may be present in the composition according to the invention in a content ranging from 0.1 % to 10% by weight, preferably from 1 % to 8% by weight and better still from 1 % to 6% by weight, relative to the total weight of the composition.

Advantageously, the aqueous phase of the two-phase composition, after a resting time of 24 hours, is transparent.

The term "transparent" is intended to mean a phase which has a turbidity of less than or equal to 300 NTU. The transparency of a composition may be measured by its turbidity, and the NTU (nephelometric turbidity units) are the units for measuring the turbidity of a composition. The turbidity measurement may be performed, for example, with a model 21 OOP turbidimeter from the Hach Company, the tubes used for the measurement being referenced AR397A cat 24347-06. The measurements are performed at ambient temperature (20°C to 25°C). The aqueous phase of the composition of the invention has a turbidity generally ranging from 2 to 300 NTU and preferably from 5 to 200 NTU.

According to one embodiment, the aqueous phase and the oily phase of the compositions according to the invention are present according to an aqueous phase / oily phase weight ratio ranging from 35/65 to 80/20, preferably from 40/60 to 70/30 and better still from 40/60 to 60/40.

Advantageously, the oily phase is present in a content ranging from 20% to 65% by weight, preferably from 30% to 60% by weight, and preferentially from 40% to 60% by weight, relative to the total weight of the composition.

The oily phase of the composition according to the invention may comprise one or more oils, these oils possibly being chosen from hydrocarbon-based, in particular mineral, plant or synthetic, oils, or alternatively silicone oils.

The term "hydrocarbon-based oil" is intended to mean an oil formed essentially from, or even constituted of, carbon and hydrogen atoms, and possibly oxygen and nitrogen atoms, and containing no silicon or fluorine atoms; it may contain ester, ether, amine or amide groups. As hydrocarbon-based oils that may be used in the composition of the invention, examples that may be mentioned include:

- synthetic esters and ethers, especially of fatty acids, for instance the oils of formulae R ¹ COOR ² and R ¹ OR ² in which R ¹ represents a fatty acid residue containing from 8 to 29 carbon atoms and R ² represents a branched or unbranched hydrocarbon-based chain containing from 3 to 30 carbon atoms; for instance purcellin oil, isononyl isononanoate, isopropyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-octyldodecyl stearate, 2- octyldodecyl erucate or isostearyl isostearate; hydroxylated esters, for instance isostearyl lactate, octyl hydroxystearate, octyldodecyl hydroxystearate, diisostearyl malate, triisocetyl citrate, and fatty alkyl heptanoates, octanoates and decanoates; polyol esters, for instance propylene glycol dioctanoate, neopentyl glycol diheptanoate and diethylene glycol diisononanoate; and pentaerythritol esters, for instance pentaerythrityl tetraisostearate;

- hydrocarbon-based oils of plant origin, such as perhydrosqualene, liquid triglycerides of fatty acids containing from 4 to 10 carbon atoms, for instance heptanoic or octanoic acid triglycerides, or alternatively, for example, sunflower oil, maize oil, soybean oil, marrow oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot kernel oil, macadamia oil, arara oil, coriander oil, castor oil, avocado oil, caprylic/capric acid triglycerides, jojoba oil, shea butter oil, meadowfoam oil and argan oil;

- volatile or nonvolatile, linear or branched hydrocarbons, of mineral or synthetic origin, and derivatives thereof, such as liquid petroleum jelly and hydrogenated polyisobutene such as

Parleam® oil; Cs-Ci6 branched alkanes or isoalkanes (also known as isoparaffins), isododecane, isodecane, isohexadecane, for instance the isoparaffins sold under the trade name Isopar by the company Exxon Chemical or the oils sold under the trade name Permethyl by the company Presperse; and mixtures thereof;

- linear alkanes, especially of plant origin, preferably comprising from 7 to 14 carbon atoms;

- fatty alcohols that are liquid at ambient temperature, containing from 8 to 26 carbon atoms, for instance octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol or oleyl alcohol.

The term "silicone oil" is intended to mean an oil containing at least one silicon atom, and in particular containing Si-0 groups.

The silicone oil(s) may be volatile or nonvolatile.

The term "volatile" refers to a compound that can evaporate on contact with the skin in less than one hour, at ambient temperature and atmospheric pressure. The volatile oil is a volatile cosmetic oil, which is liquid at ambient temperature, especially having a non-zero vapor pressure, at ambient temperature and atmospheric pressure, in particular having a vapor pressure ranging from 0.13 Pa to 40 000 Pa (10 ^"3 to 300 mmHg), preferably ranging from 1 .3 Pa to 13 000 Pa (0.01 to 100 mmHg) and preferentially ranging from 1 .3 Pa to 1300 Pa (0.01 to 10 mmHg).

Examples of volatile silicone oils that may be mentioned include cyclopolydimethylsiloxanes (I NCI name: cyclomethicone), such as cyclopentasiloxane, cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; linear silicones such as heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane and dodecamethylpentasiloxane.

Preferably, the volatile silicone oil is chosen from cyclopentasiloxane and cyclohexasiloxane.

Nonvolatile silicone oils that may be mentioned include silicone oils such as polymethylsiloxanes, especially PDMS, and phenyl polymethylsiloxanes such as phenyl trimethicones, phenyl dimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenyl dimethicones, diphenylmethyldiphenyltrisiloxanes, 2-phenylethyltrimethyl siloxysilicates and polymethylphenylsiloxanes; polysiloxanes modified with fatty acids, fatty alcohols or polyoxyalkylenes, and mixtures thereof.

According to a particular embodiment of the invention, the oil(s) are chosen from hydrocarbon-based oils. According to a preferential embodiment, the oil(s) are chosen from fatty acid esters such as isopropyl palmitate and isononyl isononanoate, fatty alcohol ethers, plant oils, mineral oils such as liquid petroleum jelly, fatty alcohols that are liquid at ambient temperature and liquid fatty acid triglycerides. Preferably, the oil(s) are chosen from fatty acid esters such as isononyl isononanoate, plant oils and liquid fatty acid triglycerides.

Advantageously, the oily phase is above the aqueous phase when the composition according to the invention is at rest (for example after storage for 1 hour at 25°C).

The oily phase may also comprise any liposoluble compound that is compatible with an oily phase, such as gelling agents, film-forming polymers, thickeners, colorants, and mixtures thereof. The composition according to the invention may also contain conventional cosmetic adjuvants or additives, which will be in one or other phase depending on their hydrophilic or lipophilic nature, for instance fragrances, preserving agents, dyes, humectants, UV- screening agents (or sunscreens), pH adjusters, gelling agents, and mixtures thereof. Another subject of the invention is a process for preparing a composition, in particular a cosmetic or dermatological composition, comprising:

a step of preparing the aqueous phase by mixing the ingredients constituting the aqueous phase (such as water, surfactants, glycols);

a step of preparing the oily phase by mixing the constituents of the oily phase;

then a step of mixing the aqueous phase and the oily phase,

said steps possibly being carried out at a temperature ranging from 20 to 80°C.

The composition according to the invention is used in non-aerosol foam form, when it is topically applied to keratin materials, in particular of human beings.

The composition in foam form may in particular be used for caring for, cleansing and/or removing makeup from the skin and/or the lips, and also as a composition for caring for or cleansing the hair. According to one preferred embodiment of the invention, the composition in foam form is used for caring for or cleansing bodily and/or facial skin.

The composition in foam form according to the invention is formed from a mixture of air with the two-phase composition described previously, which has been shaken beforehand. The two-phase composition is advantageously a liquid composition. The term "liquid" is intended to mean a composition having a viscosity of less than or equal to 2 Pa.s, at 25°C, 1 atm. and at a shear rate of 1 s ^"1 .

The composition, before it is dispensed in foam form, is a two-phase composition when it is at rest, in particular after a resting time of 24 hours at ambient temperature (25°C).

According to one preferred embodiment, the composition can be in the form of a temporary foam produced just before it is used on the keratin materials.

The aqueous composition, before it is dispensed, can be packaged in a non-aerosol foam dispenser, or non-aerosol foam pump dispenser, allowing said composition to be dispensed in non-aerosol foam form.

The composition can be dispensed from a container by means of a mechanical pump connected to a dispensing head, the passage of the composition through the dispensing head converting it into a foam at the latest at the outlet orifice of said head.

The composition may also be contained in a foam dispenser of pump-dispenser bottle type. This type of dispenser comprises, in addition to a container and an optional push-button, a dispensing head for delivering the composition, a pump and a dip tube for transferring the composition from the container into the head in order to deliver the product. The foam is formed by forcing the composition to pass through a material comprising a porous substance such as a sintered material, a filtering grid made of plastic or of metal, or similar structures.

Such dispensers are well known to those skilled in the art and are described in particular in patents US 3 709 437, US 3 937 364, US 4 022 351 , US 4 147 306, US 4 184 615, US 4 598 862, US 4 615 467, US 5 364 031 , WO 2007/091882.

The composition can be packaged in a container closed by a closing member. The closing member may be a pump-dispensing mechanism, in particular the dispensing head. This dispensing head preferably comprises a mechanical pump held in a ring intended for mounting by snap-fitting or screwing onto the neck of the container containing the mixture. The pump preferably comprises a pump body connected to a dip tube in order to enable the whole of the mixture to be dispensed. The pump preferably also comprises a push-button for activation of the pump body, such that, on each activation, a dose of composition is sucked inside the dip tube and ejected in foam form out of the dispensing orifice of the head. The containers are preferentially made of a thermoplastic, and obtained by means of extrusion-blow molding or injection-blow molding processes. The pump is for example the "F2- L9" standard model or else the "WRT4" model, provided by the company Rexam.

Preferably, the foam dispenser can comprise or can be constituted of, in addition to a container, a dip tube, a pump and an optional push-button. During the release of the product, a composition in foam form can be generated by incorporation of air into the aqueous, advantageously liquid, composition.

The composition according to the invention is therefore, on application to the keratin mate- rials, in the form of a non-aerosol foam, which can be generated by means of a dispenser which introduces air into an aqueous, generally liquid, composition at the time of release of the product.

The invention is illustrated in greater detail in the following examples. The amounts of the ingredients are expressed as weight percentages.

Comparative Examples 1 to 12:

8 two-phase compositions according to the invention (examples 1 to 8) and 4 composi- tions outside the invention (examples A to D) below (contents in weight percentage) were prepared and each composition was introduced into a packaging of bottle type, equipped with a Rexam F2-L9 pump. The device makes it possible, by pumping, to obtain a foam by pre-shaking the product 10 times before it is dispensed by the pump.

The appearance of the foam obtained after a time of 10 minutes and 20 minutes was ob- served. The packaged product was then left to stand for 24 hours and the appearance of the two-phase composition and the quality of the demixing was observed.

Example Example 2 Example 3 Example 4 1

Potassium cocoate at 16, i.e. 16 16 16 38% in aqueous solution 6.1 % AM

(Mackadet® 40-K from

Rhodia)

0.7

Cocobetaine at 30% in 10, i.e. 3% 10, i.e. 3% AM 10, i.e. 3% 10, i.e. 3% aqueous solution AM AM AM (Dehyton® AB 30 from

BASF)

0.2

Dimethicone (viscosity: 26 - - - 10 est)

Example Example 6 Example 7 Example 8 5

Potassium cocoate at 16 16 16 16 38% in aqueous solution

(Mackadet® 40-K from

Rhodia)

0.7

cocoyi amidopropyl beta- 7.90, i.e.

ine in aqueous solution 3% AM

at 38% by weight (Dehy- ton® PK 45 from BASF)

The 8 compositions according to the invention make it possible to obtain a good-quality foam, which holds well after 10 minutes and after 20 minutes following dispensing by the self-foaming pump. The foam can thus be easily spread on the hands after having depos- ited an appropriate amount in the palm of the hand, which then makes it possible to apply the foam on a large surface area of the face to be cleansed. After application and rinsing with water, the skin is clean and does not feel tight. After the use, the packaged product left to stand rapidly demixes: after standing for 24 hours, the two-phase composition exhibits a clear interface and the aqueous phase remains transparent without apparent deposit.

Example Example B Example C Example D A

sodium lauryl ether sul8.7, i.e.

fate (2 OE) in aqueous 6.1 % AM

solution at 70%

AM

0.7

mixture of sodium lauryl 24.4, i.e. 6.1 %

sulfoacetate and diso- AM

dium lauryl ether sul- fosuccinate (50/50) in

water at 25% (Stepan- Mild LSB from Stepan)

disodium lauryl sulfosuc- 6.35, i.e.

cinate at 96% by weight 6.1 % AM

in water (Rewopol® SB F

12 P from Evonik Gold- schmidt)

sodium lauroyl sar- 20.3, i.e. cosinate in aqueous so6.1 % AM lution at 30% by weight

(Oramix L 30 from

SEPPIC)

Cocobetaine at 30% in 10 10 10 10 aqueous solution

(Dehyton® AB 30 from

BASF)

0.2

Dimethicone (viscosity: 26 26 26 26 10 est)

(Belsil DM 10 from Wacker)

Dimethicone (viscosity: 2 2 2 2 350 est)

ous p ase

The results obtained show that compositions 1 to 8 according to the invention are in accordance with the expected properties regarding the quality of the foam dispensed and regarding the demixing of the two-phase product after 24 hours at rest.

Compositions A to D outside the invention are not in accordance with the expected properties:

Composition A does not give a good-quality foam and said foam is too aerated and is not uniform when it is dispensed. It cannot be correctly spread on the face.

Compositions B and D do not exhibit good demixing after standing for 24 hours: the interface between the two phases is not clear.

Composition C exhibits, after standing for 24 hours, a white deposit in the aqueous phase which is not therefore uniform.